Question

A 0.35 g sample of Li(s) is placed in an Erlenmeyer flask containing 100 mL of water at 25°C. A balloon is placed over the mouth of the flask to collect the hydrogen gas that is generated

Answer 1

Answer:

C- Using a 0.35 g sample of Li(s) cut into smaller pieces will increase the rate of reaction

C- Equal quantities of gas will be produced with potassium K, used instead of Lithium, Li.

Explanation:

First part

When a metal is present in small pieces, the rate of the chemical reaction increases. This is due to small pieces provide more surface area for reaction than huge chunks of Li.

moles of reactant decreases product formation rate also decreases and temperature decreases rate also decreases so remaining option are wrong

Second part

2Li + 2H2O --------------> 2LiOH + H2

2K + 2H2O ---------------> 2KOH + H2  

Hence, both gives same quantity of gas