Question

1. which of the following leads to an increase in the rate of a chemical reaction: a. few particles b. decreased temperature c. large particle size d. lack of catalysts e. increased temperature 8. what is the atomic number of the atom in figure 2.2: a. 3 b. 4 c. 12 d. 2 e. 6 9. isotopes have different numbers of __; thus they also have different __. a. neutrons; atomic masses b. electrons; atomic numbers c. neutrons; atomic numbers d. protons; atomic numbers e. protons; atomic masses 10. why is atp categorized as a nucleic acid: a. atp has a polar region and a nonpolar region b. all nucleic acids, such as atp, function as catalysts to increase reaction rates c. atp contains four fused carbon rings d. all nucleic acids have an amine and an acid functional group e. atp is a modified nucleotide with three phosphate groups, ribose, and adenine

Explanation:

Question 7:

Increasing temperature provides more kinetic - energy to reactant particles, increasing the frequency of effective collisions and thus the reaction rate. Other options decrease reaction rate.

Question 8:

The atomic number of an atom is equal to the number of protons. The atom in the figure has 6 protons, so its atomic number is 6.

Question 9:

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. Since atomic mass = number of protons + number of neutrons, different numbers of neutrons lead to different atomic masses.

Question 10:

ATP (adenosine - triphosphate) is a modified nucleotide. Nucleic acids are polymers of nucleotides. ATP has a ribose sugar, adenine base, and three phosphate groups, which are components related to nucleotides.

Answer:

1. e. increased temperature
2. e. 6
3. a. neutrons; atomic masses
4. e. ATP is a modified nucleotide with three phosphate groups, ribose, and adenine