HW due Wednesday, July 24
31.
A. Propane, C3H8
B. Pentane, C5H12
32. The ending "ane" implies that hexane is an alkane.
33. Yes, each of the molecules are isomers of one another. They are arranged differently, yet they are composed of the same number of atoms.
34. See drawing.
35. Butane is the shortest-chain alkane that can demonstrate isomerism due to the fact that it has four carbon atoms in it.
36. Both are correct since, although their atoms are in different arrangements, the formulas are the same.; thus, the molecules would be structural isomers of each other.
37.
A. See drawing
B. The straighter the chain, the higher the boiling point.
38.
A. A short-straight chain would have the lowest boiling point because of the weaker intermolecular forces. And because of this the bonds are much easier to break apart.
B. A short-branched chain would have the lowest boiling point because longer branched-chains have a stronger molecular force.
C. A long, straight chain has a lower boiling point because it has a weaker intermolecular force than a short, branched-chain.
1. Petroleum is considered "buried sunshine" because as a fossil fuel, it originates from biomolecules of prehistoric plants and animals, and as sunlight is captured by these prehistoric gren plants during photosynthesis, the energy released is the burning of petroleum.
2.
A. Potential energy is energy of position, or stored energy, which is ready to be released. An example of potential energy is the energy within a skate board on top of a hill.
B. Kinetic energy is energy related to motion. The skateboard going down the hill represents kinetic energy.
3. When a chemical reaction takes place and releases energy, bonds break and reatant atoms reorganize to form new bonds.
4. Butane has more potential energy because it has a higher boiling and more carbons.
5.
A. Potential energy.
B. Potential energy.
C. Kinetic energy.
D. Potential energy.
E. Kinetic energy.
6. Energy is required to break chemical bonds because it is what causes the reactant bonds to break and reorganize to form new bonds and energy.
7.
A. Exothermic; energy is released
B. Endothermic; energy is needed
C. Endothermic; energy is needed
8. Burning candle is an exothermic reaction because there is more energy in the product than in the reaction to begin with.
9. See drawing.
10. The law of conservation of energy states that energy is neither created nor destroyed. Hence, the product of a burning candle yields more energy than the energy to begin the reaction with an unlit candle. Since more energy is let off than required to begin the reaction, burning a candle is an exothermic reaction.
No comments:
Post a Comment