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. What is the formula of calcium carbonate?

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


Question 2. Which of the following elements will form a carbonate?

Oxygen.
Sodium.
Flourine.
Helium.


Question 3. What is the standard test for carbon dioxide?

Introduce a smouldering wooden spill, and it will reignite.
Add it to water, and it will raise the pH of the water.
Bubble it through limewater, where it will form a white calcium carbonate precipitate.
Attempt to light it with a lit wooden spill, and it will cause a "squeaky pop" noise.


Question 4. 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 5. 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.


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