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

Question 2. What is formed when we strongly heat limestone?

Calcium oxide.
Calcium carbonate.
Calcium hydroxide.

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

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

Question 4. What is formed when we add any carbonate to an acid?

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

Question 5. Which of the following elements won't form a carbonate?


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