Question

#1: Which concentration of hydrochloric acid would MOST LIKELY react with a zinc metal strip at the fastest rate?

A. 10%

B. 20%

C. 30%

D. 40%


#2:

Which is usually associated with a faster reaction rate?

A. using a crushed solid in the reactants

B. putting a glass cover over the reactants

C. removing heat energy from the reactants

D. using a highly diluted solution of the reactants


#3:

Hydrochloric acid reacts with zinc metal.

Which would increase the reaction rate the most?

A. using whole zinc metal strips and a 10% hydrochloric acid solution

B. using zinc metal strips that were cut in half and a 20% hydrochloric acid solution

C. using zinc metal strips that were cut in fourths and a 10% hydrochloric acid solution

D. using zinc metal strips that were cut in eighths and a 20% hydrochloric acid solution

Answer 1

A
D
B..........................

Answer 2

Answer:

1) 40%

2) using a crushed solid in the reactants

3) D. using zinc metal strips that were cut in eighths and a 20% hydrochloric acid solution

Explanation:

1) Higher the concentration, more the reactivity wit zinc metal

so 40% solution will react fastest.

2) A high surface area is related to higher rate of reaction.

If we crush a solid reactant, the surface area per unit volume will increase, which will increase the number of surface molecules and hence an increase in reaction rate.

3) Higher the concentration of HCl more the reaction rate.More the surface area of Zinc metal strip more the rate of reaction.