Snapquiz - The Limestone Cycle

This is the Snapquiz on The Limestone Cycle. Click here or use the embedded video if you haven't watched the lesson yet.


Question 1. The formation of calcium hydroxide is exothermic. What does "exothermic" mean?

It only happens when it's heated.
It doesn't change in temperature.
It absorbs heat.
It releases heat.


Question 2. What is formed when we add any carbonate to an acid?

A salt and hydrogen.
Hydrogen and carbon dioxide.
An alkaline solution.
A salt and carbon dioxide.


Question 3. What does "thermal decomposition" mean, when referring to the limestone cycle?

It uses heat to rot away.
It gives out heat as it breaks down.
It rots under hot conditions.
It breaks down into simpler compounds when heated.


Question 4. What is the formula of calcium carbonate?

CaCO3.
Ca(OH)2.
CaO.
CO2.


Question 5. What is formed when we strongly heat limestone?

Calcium carbonate.
Calcium.
Calcium hydroxide.
Calcium oxide.


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