Question

Magnesium carbonate was reacted with dilute hydrochloric acid in a conical flask.
The conical flask was placed on a balance and the mass of the conical flask and contents was
recorded as the reaction proceeded.
During the reaction, carbon dioxide gas was produced.
The reaction was done at two different temperatures.
Which row is correct?

• A. Change in mass - decrease, temperature at which the mass changed more quickly - higher temperature
• B. Change in mass - decrease, temperature at which the mass changed more quickly - lower temperature
• C. Change in mass - increase, temperature at which the mass changed more quickly - higher temperature
• D. Change in mass - increase, temperature at which the mass changed more quickly - lower temperature

Answer 1

The correct option is A Change in mass - decrease, temperature at which the mass changed more quickly - higher temperature

$\text{1.Since one of the product is in the form of gas ie. Carbon dioxide so mass decreases.}$

$\text{2.When Magnesium react with hydrochloric acid, its a exothermic reaction.}$

$\text{So lower temperature mass change queckly.}$