Poachers should be aware that Obama has been working to stop the smuggling of poached ivory in elephant tusks. If the ivory comes from an animal before 1990 it's legal to trade; therefore, people lie and make the ivory look older. Fortunately, Dr. Uno is using atmospheric testing of nuclear weapons to find out exactly how old a piece of ivory is to prevent the smugglers from trading. In his method, he tests the carbon-14 in the ivory to find out exactly how old the ivory is. Between 1952 and 1962 there was a lot of carbon 14 in the air, and each year it drops a significant amount. Dr. Uno can then tell if the amount of carbon in the air matches the level of carbon in the elephant's tusks. He measured the specimen's level of carbon 14 using the accelerator mass spectrometry. The carbon he tested matched the bomb curve, therefore his method worked and he's now able to catch the lying traders that make their ivory look older. Unfortunately, the method is expensive and countries like Africa can't afford it, even though elephant numbers have dramatically decreased.
Thursday, July 25, 2013
Poachers should be aware that Obama has been working to stop the smuggling of poached ivory in elephant tusks. If the ivory comes from an animal before 1990 it's legal to trade; therefore, people lie and make the ivory look older. Fortunately, Dr. Uno is using atmospheric testing of nuclear weapons to find out exactly how old a piece of ivory is to prevent the smugglers from trading. In his method, he tests the carbon-14 in the ivory to find out exactly how old the ivory is. Between 1952 and 1962 there was a lot of carbon 14 in the air, and each year it drops a significant amount. Dr. Uno can then tell if the amount of carbon in the air matches the level of carbon in the elephant's tusks. He measured the specimen's level of carbon 14 using the accelerator mass spectrometry. The carbon he tested matched the bomb curve, therefore his method worked and he's now able to catch the lying traders that make their ivory look older. Unfortunately, the method is expensive and countries like Africa can't afford it, even though elephant numbers have dramatically decreased.
I like the blog, but i also wish you read are home work because some of us worked harder then others. I think that we should read the home work you assign in calss and do the questions on our own for actual home work, also the workload should be spread out evenly throught the corse, instad of us learning everything in the last two weeks.
Tuesday, July 23, 2013
SBS p.258 #1 - 10
1) Petroleum is sometimes call sunshine because the energy released by burning theses fuels represents energy originally captured from sunlight by prehistoric green plants during photosynthesis.
2) Potential energy is stored energy like me sitting on a couch with spring and the couch waiting for me to get off when the spring makes kinetic energy. Kinetic energy is energy of motion, like when i get up and the spring is released.
3) When an energy releasing chemical reaction takes place, bonds break and react in atoms, and reorganize to form new bonds.
4) A molecule of butane has more potential energy based on its structural formula.
5) a) potential
b) potential
c) kinetic
d) potential
e) kinetic
6) Because energy was required to make the bonds and so it is also required to break the bonds.
7) a) exothermic
b) endothermic
c) exothermic
2) Potential energy is stored energy like me sitting on a couch with spring and the couch waiting for me to get off when the spring makes kinetic energy. Kinetic energy is energy of motion, like when i get up and the spring is released.
3) When an energy releasing chemical reaction takes place, bonds break and react in atoms, and reorganize to form new bonds.
4) A molecule of butane has more potential energy based on its structural formula.
5) a) potential
b) potential
c) kinetic
d) potential
e) kinetic
6) Because energy was required to make the bonds and so it is also required to break the bonds.
7) a) exothermic
b) endothermic
c) exothermic
SAS p.235 # 31-38
31) a) C3H8
b) C5H12
32) when it ends in ane, it means that its a single bond between the carbons
33) Yes all of the molecular structures are isomers of one another because they have identical molecular formulas.
34)
35) The shortest chain alkane that can demonstrate isomerism is butane.
36) Because its the same molecular formula but in different forms.
37) a)
b) branched isomers have lower boiling points and strait isomers have a higher boiling point.
38) a) a short straight chain
b) a short branched chain
c) a short branched chain
b) C5H12
32) when it ends in ane, it means that its a single bond between the carbons
33) Yes all of the molecular structures are isomers of one another because they have identical molecular formulas.
34)
35) The shortest chain alkane that can demonstrate isomerism is butane.
36) Because its the same molecular formula but in different forms.
37) a)
b) branched isomers have lower boiling points and strait isomers have a higher boiling point.
38) a) a short straight chain
b) a short branched chain
c) a short branched chain
Monday, July 22, 2013
p. 234 #1-30
1) A hydrocarbon is a molecule composed of only hydrogen and carbon
3) Petroleum is valuable because of its high boiling point and its molecular structure.
5) When oil is crude its because, it came from underground.
6) a) The average number of barrels of petroleum used daily in the united states for building purposes is 54 10^9 barrels.
b) 23,843 10^3 barrels are burned in the US daily.
7) gasoline and diesel fuel are a fule obtained from crude petroleum.
8) a) House hold items made from petroleum include clothing, CD's, plastic, sports equipment.
b) Methanne can replace most of the products in 8a.
10) a) The middle east has the most oil reserve.
b) Central Asia & far east Oceania have the least oil reserve.
11) a) The US consumes a lot of oil with out having reserves.
b) Africa has the most oil but the least amount of usage because they are a third world county.
12) Density can be used to separate liquids when the substances are insoluble in each other.
13) A mixture of water and acetone would be easiest to separate through distillation.
15)
16) Fractional distillation is when there are a lot more compounds, and you have to distill them further with distillation.
17) Light distillates include leto chemicals, kerosene, and refined oils.
18) At the bottom is where I would expect the fractions with the highest boiling point to be removed.
19) You can separate the mixtures by their intermolecular forces.
20) Methane, pentane, hexane, and octane.
21) A covalent bond is a bond is the sharing of two or more electrons between two atoms
22) Atoms with filled outer electron shells don't from covalent bonds because their outer shells are filled and have no reason to react; they are as happy as can be.
23) Covalent bonds are happy and share electrons; they don't fight like the ionic bonds.
26) a) A structural formula shows the bonding between the atoms whereas the molecular formula shows what's involved.
b) The structural formula is misleading because it doesn't show the amount of electrons.
27)
28) The electron carbon representation shows only valence electrons.
29) a) C9H20
b) C16H24
c) C10H22
d) C18H38
30) a) 9 (12)
20 (1)
______
128
b) 16 (12)
23 (1)
_______
215
c) 10 (12)
22 (1)
______
142
d) 18 (12)
38 (1)
________
54
3) Petroleum is valuable because of its high boiling point and its molecular structure.
5) When oil is crude its because, it came from underground.
6) a) The average number of barrels of petroleum used daily in the united states for building purposes is 54 10^9 barrels.
b) 23,843 10^3 barrels are burned in the US daily.
7) gasoline and diesel fuel are a fule obtained from crude petroleum.
8) a) House hold items made from petroleum include clothing, CD's, plastic, sports equipment.
b) Methanne can replace most of the products in 8a.
10) a) The middle east has the most oil reserve.
b) Central Asia & far east Oceania have the least oil reserve.
11) a) The US consumes a lot of oil with out having reserves.
b) Africa has the most oil but the least amount of usage because they are a third world county.
12) Density can be used to separate liquids when the substances are insoluble in each other.
13) A mixture of water and acetone would be easiest to separate through distillation.
15)
16) Fractional distillation is when there are a lot more compounds, and you have to distill them further with distillation.
17) Light distillates include leto chemicals, kerosene, and refined oils.
18) At the bottom is where I would expect the fractions with the highest boiling point to be removed.
19) You can separate the mixtures by their intermolecular forces.
20) Methane, pentane, hexane, and octane.
21) A covalent bond is a bond is the sharing of two or more electrons between two atoms
22) Atoms with filled outer electron shells don't from covalent bonds because their outer shells are filled and have no reason to react; they are as happy as can be.
23) Covalent bonds are happy and share electrons; they don't fight like the ionic bonds.
26) a) A structural formula shows the bonding between the atoms whereas the molecular formula shows what's involved.
b) The structural formula is misleading because it doesn't show the amount of electrons.
27)
28) The electron carbon representation shows only valence electrons.
29) a) C9H20
b) C16H24
c) C10H22
d) C18H38
30) a) 9 (12)
20 (1)
______
128
b) 16 (12)
23 (1)
_______
215
c) 10 (12)
22 (1)
______
142
d) 18 (12)
38 (1)
________
54
Friday, July 19, 2013
Madegascar
Usally when you think of the word madegascar you think of the movie, but in reality madegascar is a rain forest thats just for animals. A lot of scienctist do there research there because there are a lot of unkonw species synce its not toughed by humans. Unfortunatly the rate at which species have arrived on madigascar has slowed down, this is because of the theory of Adaptive Radiation, wich is the rate at which is the rete at which species arrise due to there resources. Daniel Scantelbyry looked at seven well characterized vertabrey gouts of species sharing a common atmosphere. Most of its speciation was completed within about 30m years or so. Humans have caused a decline in species growth because were so destructive. Sadly, veriety won't last longer.
Wednesday, July 17, 2013
p. 204 #1- 6
1) Allotrope is two or more forms of an element in the same state that have distinctly different physical and or chemical properties.
2) Two elements other than carbon that form allotropes are oxygen and phosphorous.
3) a) They have different appearance and structures.
b) Because of how the atoms of the elements are linked and organized.
c) Diamond is expensive due to its quality and optical characteristics.
4) Engineered materials differ from natural materials because they are efficient and renewable.
5) Tow advantages of using engineered ceramics in high - temperatures applications are higher melting point and because are strong at high temperatures. Two disadvantages are they are brittle and can fracture.
6) Tow examples of properties that can be modified in plastics to make them useful for new applications are that you can craft plastic to be harder or softer and that plastic optical fibers can be altered for use and transmission.
2) Two elements other than carbon that form allotropes are oxygen and phosphorous.
3) a) They have different appearance and structures.
b) Because of how the atoms of the elements are linked and organized.
c) Diamond is expensive due to its quality and optical characteristics.
4) Engineered materials differ from natural materials because they are efficient and renewable.
5) Tow advantages of using engineered ceramics in high - temperatures applications are higher melting point and because are strong at high temperatures. Two disadvantages are they are brittle and can fracture.
6) Tow examples of properties that can be modified in plastics to make them useful for new applications are that you can craft plastic to be harder or softer and that plastic optical fibers can be altered for use and transmission.
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