Question

Which of the following would react most rapidly?
a)powdered Zn in 1.0 M HCl at 25°C
b)powdered Zn in 2.0 M HCl at 40°C
c)a lump of Zn in 2.0 M HCl at 25°C
d)a lump of Zn in 1.0 M HCl at 40°C

Answer 1

More acid = more rapid reaction, so a and c are out. Powdered zinc has more surface area than a single lump of it. More surface area means more is exposed to the reaction, and you get a faster reaction. The answer is B. Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

Answer 2

Answer:

b)powdered Zn in 2.0 M HCl at 40°C

Explanation:

The rate of reaction increases with increase in temperature, increase in concentration of the reactant and increase in surface area. Powered Zn has a greater surface area than a lump of Zn. Also 40°C is a higher temperature than 25°C. Furthermore, 2 M HCl is a more concentrated acid than 1 M HCl. Considering the above three factors powdered Zn in 2.0 M HCl at 40°C will react the fastest.