Ihave two questions, i will make this 20 points (10 points per question)

1. when a chemical reaction occurs, atoms are never
a. ionized
b. rearranged
c. destroyed
d. vaporized

2. most reactions speed up when
a. the temperature decreases
b. equilibrium is achieved
c. the concentration of the products increases
d. the reactant is in small pieces

answer, i'll make you brainiest answer : )

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Sugar is dissolved in water. which is the solute? sugar neither both water

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)