Organic Chemistry,Biochemistry and Plastic
Organic Chemistry is the chemistry of studying compounds and molecules with carbon in them. Carbon is in all living things. Carbon can bond with many other atoms. This type of Chemistry deals with the making of organic compounds through chemical reactions. Organic chemistry studies hydrocarbons molecules with only hydrogen and carbon. Methane is an example of a hydrocarbon. Carbon forms long chains of molecules called polymers. Polymers are in plastics. Polymers are made of smaller molecules called monomers.
how did your
Carbon facts:
Atomic radius 67 pm
Atomic mass 12
Melting point 6422 F
boiling point 7281 F
Electronegativity 2.55
2 electron shells.
atomic number 6
forms diamond.
history
Jons Berzelius was a Swedish chemist who found the difference between Inorganic and Organic. Justus von Liebig also worked on organic chemistry.
Biochemistry
This is the study of chemical reactions and molecules in living things. Like proteins and reactions that keep things living. Biochemistry also deals with the molecules DNA is made out of.
History
The starting of Bio chemistry is sometimes considered the discovery of the first enzymes. ( These are large molecules that help you live in chemistry ) In 1833
Anselme Payen ( french) found it. They started using the name biochemistry in 1903. Carl Neuberg a German
chemist coined it. The structure
of DNA molecule
was discovered in 1953. It is made out of four Compounds
that are made with Carbon
,Hydrogen,Nitrogen and Oxygen. They are: Cytosine,Quanine,Adenine and thymine.
Proteins and other Biomolecules
Proteins are large molecules made out of amino acids. These are smaller organic compounds. Each Amino acid contains three groups. Carboxly,Amino and side-chain. These are just molecules.
Carbohydrates are Molecules made out of smaller molecules called
Monosaccharides. The simplest form of sugars. Some of these are glucose and fructose. So some Carbohydrates
are large sugar molecules. Carbohydrates are the most common Biomolecule. they store energy.
Lipids are fats. Nucleic acids are molecules that make DNA.
Fast fact!
Biochemistry may become obsolete with the invention of STED microscopy and PALM which are improved optical microscopes. With them you can see actual molecules ! 3 chemists just got the noble prize in chemistry for these inventions !
Plastic
The word plastic means that is can be shaped. Anything that has plasticity. But if that was plastic then clay and dough would be plastic too. The kind that we think of when you say it is a name for Polymers.
Plastics are usually made out of organic polymers. Polymers are big long molecules. There are Biopolymers like in DNA and there are Plastic polymers. I already wrote about Biopolymers. So I will write about plastic polymers. Plastics are made out of Polymers. Here are some types: Natural plastics: Tortoise shells and trees sap , Polystyrene: this is packaging foam. It is in plastic utensils and food containers. , Polyamide: Nylon used in toothbrush bristles. , Polyester&
Polyethylene terephthalate: used in clothes and soft drink bottles, Polycarbonate: used in CD's and glasses , Arcrylonitrile Butadiene Styrene or ABS: This is used in keyboards and computers,
Polypropylene: This is used in many things from clothes to loudspeakers. It has a number five,
Polyethylene: most common plastic. Used in packaging, Polyvinly chloride: used in construction and Teflon a non stick plastic used in water slides.
Fast fact!
Polyethylene is a long hydro-carbon.
SPI Resin identification code
The SPI Resin identification code is a set of numbers in the recycle icon put on plastic things. The Society of the Plastics Industry made it in 1988. The main purpose of this was for recycling. They needed to separate different plastics/polymers for recycling.
here is a list:
1:
Polyethylene terephthalate: Soft drinks: Usually recycled
2: High density
Polyethylene: Bottles and grocery bags:Usually recycled
3:
Polyvinly chloride: Pipes: Not very commonly recycled
4: Low density
Polyethylene:Bags: Rarely recycled
5:
Polypropylene: food containers: Rarely recycled
6: Polystyrene: packaging peanuts:
Rarely recycled
7: Other plastics like Polycarbonate and nylon: Headlight lenses: Almost none recycled
Plastic changes from a liquid to a solid while it is being processed. So it is easy work with. You just pour it in a mold. Many things in the world are made out of plastic. The world would be different without it. Plastic is bad for the environment. Reasons: 90 % of plastic is made with petroleum a non-renewable resource. (this means that when the petroleum is gone we can't get it again)Another bad things about plastic is that it almost lasts forever ( it takes hundreds of years for plastic to decompose). Because it is made out of artificial molecules. Burning it gives of harmful chemicals so that's not good either. When you make plastic it creates pollution! Chemists are trying to make something better than plastic. One good way is with Nano-carbons. Molecules made by heating carbon with extremely high heat and changing the carbon atoms into molecules that are like plastic. The can be shaped easily. Making them makes very little pollution. The Tech is not ready yet but they have been used to make bowling balls.
Fast fact!
In china Plastic bags are called white pollution.
history
People have used natural plastics for a long time. Like during the medieval ages people used cow horns for drinking cups. Modern plastic came from things like rubber. Natural rubber comes from trees. The Mayans used the rubber to make balls to play games. Rubber is hard in cold temperatures and soft ans mushy in hot temperatures. In 1839 Charles Goodyear ( an american engineer: born
12/29/1800 Connecticut. died 7/1/1860 new York ) discovered how to treat rubber to make it withstand temperatures. It is called vulcanization. His rubbers was able to resist water, Chemical reactions, Electricity and other stuff. It could be molded in different shapes. The rubber tree became obsolete when people discovered how to make artificial plastics out of human made molecules. In 1856 Alexander Parkes patented Parkesine. Parkesine was the first man made plastic. It was made out of cellulose ( Organic compound with the formula C
6H
10O
5 it is a polymer) treated with nitric acid (
HNO3) and a solvent ( something
the dissolves something
else ). The first man made plastic made with synthetic( man made ) polymers
was Bakelite
. In 1907 Leo
Hendrik Baekeland ( a Belgian
american ) invented Bakelite.
Bakelite is considered
the first
true plastic because
it is made out of man made polymers. Bakelite was cheap and strong, humans loved it.
clay and dough like plastic
Clay can be shaped with your hands easily.
The Nuclear weapon, Radioactivity and Nuclear power
Nuclear weapon
The Nuclear weapon is a highly dangerous weapon.
History
In 1898
Pierre
and Marie Curie discovered that pitchblende had a radioactive element in it which they called Radium. Ernest Rutherford said that the Nucleus was giving way and changing into different elements. People believed that here was hidden energy waiting to be used in these atoms. In 1933 Adolf Hitler became chancellor (leader) of Germany. It was dangerous for Jews to stay in Germany. Leo
Szilard ran away to London. He patented the idea of a nuclear chain reaction ( this happens when a nuclear reaction ( This happens when two Nuclei hit each other and make different nuclei.) causes more nuclear reactions ). Szilard gave the patent to the British Leaders of the navy. Enrico Fermi said that when he shot neutrons at uranium he made artificial radioactivity. In 1938 Fritz Strassmann and Otto Hahn said they found the element Barium when they shot neutrons at uranium. This is because the Uranium Atom was decaying/splitting into other elements. Otto Frisch did a Experiment in 1939 and proved that the Uranium had decayed or split apart. He called it fission. When WWII began many Physicists new that the Fission bomb could be made. But they did not exactly know how to make it. Leo Szilard was worried that Germany was working on making a Nuclear bomb. He decided that he needed to write a letter to the President ( FDR ). Saying that america needs to make a Nuclear bomb before the Nazis. He wrote the letter and asked Albert Einstein to sign it. Albert did and it was given to the President. This led to the Uranium committee and then the Manhattan project. The Uranium Committee was paid low and it did not work out well. When an attack on pearl harbor happened The Manhattan project started. General groves was put in charge of it. It cost about 2 billion dollars in time it was made and 26 billion dollars now. A lot of time and money was spent in mining and extracting Uranium-235 and Plutonium 2 radioactive elements. These were needed to make the weapons. The scientist were put under command of J. Oppeinhiemer. There was many great scientist working on the project. The base lab was in Los Alamos, New mexico. Oak ridge,Tennessee was also a big factory. The United states of America and the United Kingdom helped each other during WWII but they did not tell the soviets about it. The Manhattan project was super secret. U.S.A and U.K did not want the Nazis to make a bomb this terrible. They did not want the soviets to find out either. But the soviets found out and the cold war happened, But that and WWII are whole other blogs. The weapons thought of in 1942 were Little boy,Thin man and Fat man. Thin man did not really work out. The Germans were working on a weapon but they were not paid very much by the Government, so their project never reached its goal. In July 16 1945 The trinity test happened. It tested the gadget an Implosion/Plutonium bomb. Implosion is the opposite of explosion. It happens when matter goes inward not outward. After that they made two bombs Little boy and Fat man. Little Bot test was in April 1945. It was not done with pure Uranium so it would not actually explode. They used the gun method here. They shot some Uranium at some other Uranium and made a chain reaction. Fat man was practically the same thing as the gadget. The implosion worked by surrounding the plutonium with regular bombs and then when the bombs exploded they would squash the plutonium and make a nuclear chain reaction. They dropped little boy on Hiroshima on august 6 1945. Then they dropped fat man on Nagasaki on August 9 1945. Then WWII ended. The cold war came and went. But that is an another blog.
Fast fact!
Albert Einstein did not work on the Manhattan project. He did not even know it existed!
How it works
A Nuclear bomb explodes when a nuclear chain reaction happens. Like I wrote above a nuclear chain reaction is when many nuclear reactions happen.You can learn more about this in Nuclear Fission and Nuclear Fusion part of Radioactivity.
Radioactivity
An atom that is radioactive decays losing high energy particles or waves. Radioactivity is also called radioactive decay. The number of Protons Neutrons and electrons changes in a unstable atom. An atom is unstable when its number of protons neutrons and electrons changes. When an atom losses these particles it turns into another element. Radioactive atoms also give off beta,alpha and gamma rays.
Fast fact!
Uranium happens naturally in 2 isotopes: Uranium-235 and Uranium-238. Uranium-235 is a Fissile ( it can make a chain reaction) Uranium-238 is not.
Nuclear fission
Is either a Nuclear reaction or radioactive decay. It happens when an atom's nucleus splits into other smaller nucleus's. It is what happens in most Nuclear weapons.
Nuclear fusion
This happens when 2 nucleus's going at very high speeds collide and from a new nucleus/atom
. It happens in the sun and other stars.
Nuclear power/Energy
Nuclear power is the power or energy that comes from Nuclear fission and Fusion. When Fission or Fusion happens large amounts of energy are released. There is energy in the nucleus. It can be harnessed like this. you put Uranium in tubes ( Fuel rods ) that are in water inside a Nuclear reactor. Then nuclear Fission happens in the fuel rods. It makes a controlled chain reaction which releases energy as heat and warms up the water turning it into steam which turns turbines of generators that make electricity. It might be better than fossil fuels but it makes nuclear waste that is radioactive. Nuclear fusion would not make waste. Nuclear waste stays around for a long time and it is dangerous for living things like us.
Quantum Physics/Mechanics
Quantum Physics tells us how sub-atomic particles work and move around. It is pretty complicated and not much is understood about it. There is also plenty about light in it. Calculus and algebra is used extensively in quantum mechanics.
Basics
History
Some cool Chemistry facts
#1 Hydrogen is the lightest and most abundant element in the Universe
#2 When some snakes inject venom from their hollow fangs ( the venom is made in glands that are behind the mouth) the venom which is a protein attacks the blood circulation. The cool thing is that if you swallow the venom it isn't poisonous. Because when the venom goes in your digestive system the Digestive system breaks it down.
#3 "Chemistry is the science of change. Chemistry is a physical science; it lies between biology and physics " Eyewitness Chemistry pg 6 & 8
#4 Your mouth and throat burn when you eat chili peppers. This is because of a compound called capsaicin. Capsaicin helps digestion and helps get rid of waste.
#5 What compound is mostly responsible for changing colors and camouflage? Melanin. Melanin is a general name used to talk about many natural colors or pigments. Melanin also helps you tan and protects you from the suns UV radiation.
#6 Only red " Neon sings " actually contain Neon. Here is what Neon sings are: they are tubes that are filled with a noble gas and then run an electric current through them. With real neon signs it is like this. But with some other sings you fill the tube with a gas and some Mercury. When the tube gets electrified the mecury evaporates into gaseous mercury. This Mercury vapor makes ultraviolet light. This UV light makes the coatings in the tube energetic. When these coatings react they make different colors.
#7 Argon 18 was discovered in 1894 by Ramsay and Rayleigh.
#8 Francium 87 is so so so rare that at any moment the crust of the earth has around 30 grams. It is Radioactive so it keeps decaying into other elements. It also makes combines with many elements. It is one of the rarest elements.
#9 Uranium is the heaviest naturally occurring element. You can make many other heavier element in the lab and their might not be an end.
#10 The bitterest thing in the world is Denatonium benzoate C28H34N2O3. This thing saves many lives. An extremely small amount is added to many poisonous things like Gasoline and pesticides. It makes these things taste terrible and makes children and other people not eat or drink it.
#11 A compound called Cyanoacrylate ( usually know as super glue
) is useful for gluing and for crime cases.
Some things from my Coursea class on chemistry
Recently I took a Course on chemistry using coursea from duke university.
Week 1
In week 1 we learned about Scientific notation, the scientific method, significant figures, measuring, matter, energy, Coulomb's law , basic stoichiometry, the mole, physical changes and chemical changes. So scientific notation is expressing really big or really small numbers, like 6*10^12. That ^ sign means you multiply the number before it times itself the number after it times. So it would be 10*10 12 times. This equals 10*10*10*10*10*10*10*10*10*10*10*10=1 with 12 zeros=1000,000,000,000 . then we multiply it by 6 , this equals 6000,000,000,000 = 6 trillion. The scientific method is a method to learn about the world a prove what is right. The first step is to have a hypothesis, an educated guess about what would happen in an experiment. Like, if you had identical bottles and filled them all with the same amount of vinegar and baking soda. Then you put identical balloons on them. Say you have a hypothesis that if you add more vinegar to one , it will fill up the balloon faster. The amount of vinegar is called a variable, the amount of backing soda, the size of the bottles, the heat and the pressure they receive, these are all variables. For an accurate experiment you must keep all other variables the same for both bottles , except the variable you will change, the amount of vinegar variable. The next step in the scientific method is to conduct the experiment, then the last step is to record the results. There are rules for which numbers in a number are significant, and which are not. They are; 1 any non-zero numbers are significant 2 zeros before non-zeros are not significant 3 zeros to the right of the decimal point and after non-zeros are significant 4 zeros between non-zeros are significant. We learned about measurement units, and conversion factors between imperial and the metric systems. We learned about prefixes like mega, kilo, deci, centi, milli,micro and nano. Mega is 1000,000 meters, Kilo is 100, deci is 0.1, centi is 0.01, milli is 0.001, micro is 0.0001 and nano is 0.00001 meters.
We also learned about matter , the definition of matter is : anything that takes up space and has mass. The stuff of our world is matter, Mass is how much matter their is. Matter is made of Atoms, and Atoms are made of subatomic particles, the main ones being: protons , neutrons and electrons. The course also taught me about the periodic table, the elements, molecules and compounds which you can read about
here. I learned about energy from the perspective of Chemists and Chemistry. There are 2 main things, things go to lower energy and energy changes when charged particles interacted with each other. Like when magnets of opposite charges come close together, the energy is lower, and when same charges come close the energy is higher. We also leaned about Coulombs law. It is the mathematical equation that describes the interaction between charged particles . Here it is:
F=
k q1 q2
Ɛ r2
The F stands for force, attraction or repulsion. K is a constant, always the same positive number. q1 and q2 are the
charges.
Ɛ is the dielectric constant, it is represented by a epsilon. The dielectric constants is the medium the attraction is happening in , like water or air. The r2 is the distance. By making the distance closer you make the force stronger. We learned about basic stoichiometry, namely writing and reading chemical formulas. I already knew how to do that :). Then we learned about the mole, 6.02*10^23. We learned that a mole of something ( like an atom or a molecule )
, equals that things atomic mass in grams. Like on mole of gold has a mass of 196.97 g. Because the atomic mass of gold is 196.97 u. The u stand for average atomic mass. After this we saw experiments , like ones on chemical change ( rearranging of atoms ) and physical change ( changing the shape and other things but keeping the same chemical ). I got 93 % on that weeks quiz
Week 2
On this week we were informed in more detail about atoms, elements and the periodic table. We learned about ions, isotopes and ionic bonds. I mostly cover all this in my first blog of Atoms and Chemistry. After this we learned about periodic trend like 1st Ionization energy and electronegativity,atomic radius, thermochemistry and density. Periodic trends are
trends of property that are on the periodic table, like 1st ionization energy. 1st Ionization energy is the energy that it takes to remove a single electron from a neutral atom. The 1st Ionization energy goes from lowest ( easiest to remove e- ) in the bottom left corner to high 1st ionization energy ( hard to remove ) in the upper right corner. This is because the elements in the upper right corner only need a few electron to get a full outer shell. The elements here also have less shells and the e-'s are more strongly attracted to the nucleus , harder to take away. The elements in the bottom left corner have very few electrons in their outer shell ( this means it would be easier to take away a few than add many to get a full shell ), and they have more shells, therefore the e-'s are less attracted to the nucleus through the shielding effect. The outer most electrons have so many e-'s shielding them from the full charge of the positive nucleus. Helium has the highest 1st ionization energy, it is the hardest to take an electron from a helium atom. It has only one shell, so technically there is no shielding effect felt. Also it is has a full outer ( valence ) shell. Electronegavity is the ability of an atom to attract bonding e-'s. This trend goes the same way, with fluorine being the most electronegative element. Fluorine has only 2 shells so the shielding effect is hardly felt, and all it needs is 1 more e- to get a full shell. The 2nd shell is relatively close to the nucleus and it has lower energy than most other atoms, since e- like to go to lower energy that is another reason they go. But if that was the only case Hydrogen would be the most electronegative element. you also have to need only one e-. Hydrogen only needs one more e- for a shell also, but it has another option open to it: to get rid of its one e-. Fluorine only has one sensible option so it is more electronegative. Noble gases are generally considered not to need e-'s so they are blotted out of the picture. But noble gases do react, you can read more about it below. The scale used to measure electronegativity was made and named after Linus Pauling: the Pauling scale. The atomic radius is how big the atom is. As you go along a period ( across the periodic table ) atomic radii get smaller. This is because each element in a period has the same number of shells, but different number of e-'s and p+'s. The growing number of protons attracts the outer shell more and shrinks the atom . The element that has the largest atomic radius is Cesium , 55. Every element at the start of their period are the largest in their period. Cesium is close to the bottom and had more shells than the other first period elements. Thermochemistry deals with heat and energy. Lets take a system with clearly defined boundaries. Energy could flow into the system or out of the system, everything that is not in the system is the surroundings. We can calculate the energy of the system if we take the systems final energy and subtract the systems initial energy. For energy flowing in to the system the energy is positive, for it going out it is negative. We also learned about density in week 2. The density of something is its mass divided by its volume.
ρ= Mass/Volume
Rho
ρ is denisty, mass could be grams or it could be something else, volume could be mililiters, or something else
ρ= g/mL
so if you had 1 gram of water in 1 mililiter then its density is 1 g/l
ρ= 1 g/ 1 mL
ρ= 1 g/mL
things more dense than water sink, while thing less dense than water float. The tighter packed the molecules in substances are the more dense they are.
I got 90 % that week
Week 3
This week we learned basic chemical nomenclature. We were introduced to oxidation states. This is the charge of an atom if the bonds were parley ionic. We learned how to name ionic compounds and learned about covalenant bonds ( bonds where atoms share e- ). We also learned how to calculate formula mass. Below in Essay 1 I write how to do these things.
This week I got 90 %
Week 4
This week we learned about chemical composition, mole ratios, formulas and chemical reactions
A formula of a molecule is how many atoms their are in it. H2O 2 hydrogens and 1 oxygen.
Chemical reactions are what happen when different compounds interact and atoms change places. We learned how to balance chemical reactions. Here is one:
Fe + O2 ------> Fe2O3
To balance it you add coefficients like this :
4Fe + 3O2 ----> 2Fe2O3
now the atoms of each element on the reactant side equal the ones on the product side.
this week I got 77 %
Essay 1
Here is a Compound:
TiI4[1]
I chose this compound because it's my name backwards! Ian Timothy.
Lets name it. First we need to decide which rules to use, for this one we will use the Ionic compound rules. First we name the ions in the compound. The Ions here are: Titanium cation and Iodide anion. The Cation is written first, then the Anion. Since Titanium's oxidation state can change , we need to write it. To write the oxidation state of Titanium, we use parentheses and roman numerals like this: (III) . We need to figure out the oxidation state of Titanium in this particular compound. To discover it we look at Iodide, it has a oxidation state of -1. There are 4 Iodide's and all the Iodides charges combined equal -4. The compound is neutral so the oxidation state of Ti is +4. We write the name like this: titanium(IV) iodide. The IV shows the oxidation state of Ti.
Now lets calculate its mass. There is 1 Ti and Ti's average atomic mass is 47.88. There are 4 Is and I's average atomic mass is 126.90, you times this by 4, and get 507.6. You add 47.88 and 507.6 to get 555.48. 555.48 u ( u stand for average atomic mass ) is the mass of this compound
Now let figure out how many protons, neutrons and electrons there are in it. There are 234 protons, 234 electrons and 322 neutrons.
Nanotechnology is a fairly new field of science. It deals with things at the tiniest scale, like atoms and molecules. Nanotechnolgy is a future technology. We can not do it with nanotechnology now, but here is how you would turn lead into gold: Lead or Pb has 82 protons, while gold or Au has 79 protons. The number of protons affects the type of element , so take Pb, and with a awesome tiny nanotechnology tool or machine ( which has not been invented yet, but hopefully it will be ! ), you take away 3 protons from the nucleus of the Pb atom. Also take away three electrons to make the atom have a neutral charge. Add those protons and electrons to other atoms , changing them into different elements. Once those three protons and electrons went away.... the lead turned into gold!!!! It went from Pb to Tl ( Thallium ) to Hg ( Mercury ) and finally to Au! Now if nanotechnology got this advanced, there would be so much gold on the earth , that it would be worth very little! Now for centuries people have been trying to change lead ( or some other inexpensive metal ) into gold. Alchemy was chemistry during the middle ages, but it had a more magical bases then modern chemistry. Alchemists main goals were to change lead into gold and make a eternal life giving potion. They never succeeded in either ( they would have succeeded with one if they had super advanced nanotechnology ), but the Chinese ( while trying to make eternal life potion ) instead made gunpowder ( this was around the 11th century )! The gunpowder was a mixture of Charcoal ( which has carbon ) , Sulfur and a Nitrate. Nitrate itself has the formula NO3 , but for gunpowder potassium is usually added to the molecule. Potassium Nitrate is a neutral atom , since Nitrate has a oxidation state of -1, and Potassium or K has a oxidation state of +1. The formula for potassium nitrate is KNO3, The charcoal ( mostly C , but not pure C ) and the S are fuel for the combustion of gunpowder. The KNO3 gives oxygen to the combustion helping it explode. The Chinese used gunpowder for fireworks , and also for primitive gunpowder weapons . When the Mongols conquered China ( in 1279, they conquered the song dynasty , during this dynasty gunpowder was invented ), the technology of gunpowder spread along the Mongol empire ( the largest empire connected by land, and second only to the British empire, part of 32 modern countries ) and into Europe. This led to the end of traditional European middle age ideas , Like knights in shining armor and castles. So chemistry contributed to ending knights in shining Armor !
( week 5 was a break ) Week 6
This week we learned about dissolving, solutions and precipitates. Here is how you write a dissolution equation:
Dissolution
NaCl(s) ------------> Na(aq)+1 + Cl(aq)-1
H2O
This is the dissolution of sodium chloride in dihydrogen monoxide ( Water ). Sodium chloride is ionic compound, with 2 Ions. When it gets dissolved in water the water molecules get between the Na and Cl ions, so they do not bond. Interestingly the partially negative ( because water is a polar covalent bond ) O faces the NA cation, while the partially positive H faces the anion Cl. Sometimes when two different compounds are dissolved in water a precipitate forms. This is when a solid forms. There are a list of rules called the solubility rules, these rules explain what is soluble and what is not.
here are the rules:
- most compounds of ammonium and alkali metals are soluble.
- most compounds that have many atoms and have a low charge are soluble, like acetate ( C2H3O2-1 ) and perchlorate ( ClO4-1 )
- most compounds of the halogens are soluble , except those with silver (I), copper (1), Thallium (I) , mercury(I) and lead (II) cations
- most compounds of sulfate ( SO4-2) are soluble , except ones with calcium, strontium, barium and lead (II) cations
- most other ionic compounds are insoluble
If you had two compounds that were soluble and when dissolved in water formed a precipitate, than the atoms rearrange and form a compound that is not soluble and a precipitate forms. Like if you had beryllium chloride ( BeCl2 ) and dissolved it in water. Then you take mercury (I) sulfate ( Hg2SO4 ) and dissolve it in water. A precipitate will form. This precipitate is mercury (I) dichloride (Hg2Cl2 ). If you look at the solubility rules you will see beryllium chloride and mercury (I) sulfate are soluble. Mercury (I) dichloride is NOT soluble though and forms a precipitate. The dissolution equation would look like this: BeCl
2(s) + Hg
2SO
4 (s)------> Be
(aq) + SO
4(aq) + Hg
2Cl
2(s) .
I got 8.83% this time
Week 7
This week was about Acids, bases, reduction,Oxidation and
stoichiometry . First I learned about Acid-Base reactions. I learned about the definitions of acids and bases, from the Arrhenius definition to the Lewis definition. The Arrhenius definition says an acid is a substance the forms H+ cations when dissolved in water. While bases formed OH- , Hydroxide anions when dissolved in water. The Brownstead-Lowry definition says an acid is a proton giver, while bases are proton takers. The Lewis definition says an acid is a electron pair ( 2 electrons ) takers while bases are electron pair givers. There are two main types of electron transfer reactions. They are the acid-base reactions and the redox reactions.
90 % this week
Week 8 ( exam week )
Second part
I completed the first part with a grade and am now doing the second
Week 1
I got 100% this week
Week 2
I got 100% this week
Week 3
I got 90% this week
Week 4
I got 90% this week
My BYU course on chemistry
I am doing an online chemistry course by BYU. It is a high school honors course. It is a self study course with no deadlines.
Lesson 1
This lesson taught and tested me on basic chemical nomenclature. I learned about various polyatomic ions, like cyanide ( CN-1) , hexafluorosilicate ( SiF6-2 ), Iodate ( IO3-1 ) and dichromate ( Cr2O7-2). We used these polyatomic ions in naming compounds. I got a A- because I tapped the down arrow to go to the next problem, but instead it made my answer go down one. On essay 1 above I write how to name TiI4.
Lesson 2
This lesson taught and tested me on complex chemical nomenclature. I learned how to name complex inorganic ions. For cations ( positively charged ions ) you put the name of the metal ( usually the first element in the molecular formula ) at the end of the name and assign an oxidation state if needed. Then you take the anion ( or the second part of the molecular formula, like Ammonia ) in the compound ( chloride, fluoride, Iodide exc ) and change its name to a ligand. To do this you replace the -ide with an -o. So chloride would be chloro, fluoride fluoro and so on.... . Then you take the ligand and put it at the starting of the name, to the left of the metal. If there is more than 1 ligand add a prefix to the start like di- or tri-. Three chlorides would become trichloro. Finally at the word Ion to then of the word . Here is an example:
name SnCl2+2
so we put tin at the end:
tin
Tin needs an oxidation state. Cl has an Oxs of -1, and there are 2 of them. So for the overall charge to equal +2 you need to make Sn have an oxs of 4. You do this by writing roman numerals in parentheses:
tin (IV)
OK lets change Cl2 into dichloro:
dichlorotin (IV)
and finally ad Ion to the end
dichlorotin (IV) ion
That's it for naming complex positive inorganic compounds. Now lets name complex negative inorganic compounds. This is a bit harder. First you take the metal and put it at the end of the name, just like the complex cations. But you have to change the metals name a bit ( or a lot ). You have to write it in Latin form , if possible. Gold : Aurum, Lead: plumbum and so on. Then you need to change the end of the name to -ate. Arumate, Plumbate and so on. Finally you add an oxs if necessary ( note : metals that do not have a Latin form just change the end of their name to -ate: Chromate and so on ). Then you change the end of the molecular formula ( almost always a non-metal ) into a ligand, add prefix if needed and put it to the left of the metal. Finally like the cations, you add the word ion to the end. Here is an example:
SnCl4-2
This is similar to the first example but the number of Chlorides has changed along with the overall charge. So lets change tin into it's right form for this compound. Tin is S
tannum. We change the end to -ate and get stannate. I just love that word : Stannate , doesn't it sound so cool ? Anyway lets put stannate at the end:
stannate
Stannate needs it's oxs in parentheses, beacuse the over charge is -2, and each of the 4 Cl are -1,
Stannate has to be +2:
stannate (II)
Now lets take the 4 Cls. Well we change this into tetrachloro, tetra for four and we make it a ligand:
tetarchlorostannate (II)
Finally we add the word Ion to the end:
tetarchlorostannate (II) ion.
Not all metals need their oxs in parentheses . For example all the alkali , alkali earth metals, Zinc
, Silver and aluminum. The Alkali metals are +1, alkali earth +2, Silver +1, Zinc +2 and Aluminum
+3.
I also learned how to name and draw structures for basic organic molecules called hydrocarbons. Hydrogen and carbon form very stable compounds. Each C typicality needs 4 bonds. It has 4 Valence Electrons ( VE ) and it needs 4 more to have a full shell. I learned that molecules with Carbon start with Meth-, 2 C Eth- and so on. I learned the molecules with all single bonds ended with -ane, at least one double end in -ene and at least 1 triple end in -yne. CH4 is Methane:
H
|
|
H-------C-------H
|
|
H
One carbon starts with Meth- all single bonds ends with -ane. This is the simplest hydrocarbon. Other hydrocarbons have long chains of carbons connected to hydrogens and side chains. Side chains are a carbon connected to hydrogens that branch of from the main chain.
side chain
\
\ H
\ |
H H---C---H H H
| | | |
| | | |
H-------C-------C-------C-------C-------H
| | | |
| | | |
H H H H
This hydrocarbon has 4 carbons in the main chain. The name of the main chain would start with but- , there are all single bonds so the main chains name would be butane. We need to name the side chain now. This side chain has 1 carbon, Meth-. all side chains end with -yl. So this side chain is called Methyl. You put the name of the side chain first: Methylbutane. The last thing we need to do is write the address of the methyl. This means if you count the carbons which one it is on. First count both ways. From left to right it is 2, from right to left it is 3. You choose the lowest number, 2. So the name of this hydrocarbon is 2-methylbutane. Ta da! This is only the basics of the basics of the basics. If there were more than 1 methyl you would add a prefix like di, tri, tetra, pent and so on. There are other types of side chains like Ethyl ( C2H5 ) and if you have both in one molecule you would list Ethyl first , because it comes first in the alphabet.
Anyway on lesson 2's quiz I got another A-.
Lesson 3
This lesson deals with the math in chemistry, scientific notation, significant figures, Density calculations and factor label problems . I got an A- on it
Lesson 4
This lesson deals with the mole, 6.0221415*10^23. It introduces it and tells you how to use it. We learned how to calculate the molecular weight, the percent of each element in a compound and how to convert between moles, grams, and atoms. I got a A on it.
Lesson 5
This lesson went deeper with the mole and taught use about molarity (M=m/mw/L) , how to calculate empirical and molecular formulas, and how to calculate the formula for a hydrated crystal. I got an A on this.
Oxidation and Gas laws
Oxidation and Reduction
Gas laws
Therochemistry,Kinetics,Free energy and Entropy
Chemical Nomenclature, Electrochemistry, Photochemistry and Geochemistry
Chemical Nomenclature
Chemical nomenclature is the process of naming compounds and chemicals. There are many ways to name compounds,
Fast fact
Biographies of Some chemists
Democritus
Carl Wilhelm Scheele
Antonie laurent de lavoisier
John Dalton
Niels Bohr
Otto Hahn
Ernest Lawrencium
Albert Einstein
J. Robert Oppenheimer
Element country and Stoichiometry
Sweden
This might seem like an unlikely country but it is a favorite of mine and of the elements
Stoichiometry
Noble Gas compounds
link to the pH, Acids and Bases
sources: Brainpop,Wikipedia, Ted-Ed , The elements app, www.eurekalert.org,www.exploratorium.edu/cooking/bread/bread_science.html, http://www.ck12.org ,
What your Fifth grader needs to Know, a bit of
The atom bomb project, Eyewitness Chemistry, Coursea, Smithsonian enclyopedia
and Khan academy
