Question

1. why is information about carbon critical to understanding the \molecules of life\?

a. it is the backbone of biological molecules required for life
b. it is the only element that can form triple bonds
c. it results in the theory of vitalism (organic molecules are produced only in living organisms)
d. it is able to cause dehydration synthesis

1. organic chemistry is the study of compounds containing

a. carbon and hydrogen
b. carbon and helium
c. carbon and nitrogen
d. hydrogen and nitrogen

1. what is the characteristic of carbon atoms that most contributes to its importance to critical biological molecules?

a. the ability to bond with eight (8) other atoms
b. the ability to form hydrogen, carbon and covalent bonds
c. the ability to choose the type of molecule to produce
d. the ability to form 4 (four) bonds producing a 3d structure

1. why are fossil fuels, such as gasoline, considered organic compounds?

a. they contain both hydrogen and carbon
b. they contain hydrogen
c. they contain carbon
d. they are only produced from living organisms

1. there are two forms of hydrocarbons. which is most able to accept new atoms and why?

a. saturated hydrocarbons; they have double or triple bonds that can be broken
b. saturated hydrocarbon; they have single bonds only which are easier to break
c. unsaturated hydrocarbons; they have double or triple bonds that can be broken
d. unsaturated hydrocarbons; they have single bonds only which are easier to break

Explanation:

1. Carbon is the backbone of biological molecules (like carbohydrates, lipids, proteins, and nucleic acids) that are essential for life. Vitalism theory was disproven. Other elements can form triple bonds (e.g., nitrogen). Dehydration synthesis is a process, not a property of carbon.
2. Organic chemistry is defined as the study of compounds containing carbon and hydrogen. Helium is a noble gas and not typically in organic compounds. Nitrogen - containing compounds are a subset, but the general definition is carbon - hydrogen.
3. Carbon can form 4 bonds (tetravalent) which allows for a 3D structure. It can't bond with 8 atoms. Hydrogen bonds are not formed by carbon in the way described in option b. Carbon doesn't "choose" the molecule type.
4. Fossil fuels are considered organic because they contain both hydrogen and carbon. Just containing carbon (like carbonates are inorganic) or hydrogen is not sufficient. They are not only produced from living organisms in the strict sense (as they are fossilized).
5. Unsaturated hydrocarbons have double or triple bonds. These bonds can break and accept new atoms (e.g., in addition reactions). Saturated hydrocarbons have only single bonds and are more stable (less reactive in terms of adding new atoms).

Answer:

1. a. it is the backbone of biological molecules required for life
2. a. carbon and hydrogen
3. d. the ability to form 4 (four) bonds producing a 3D structure
4. a. they contain both hydrogen and carbon
5. c. unsaturated hydrocarbons; they have double or triple bonds that can be broken