calcium carbonate

Question 1

What would you observe if you added calcium oxide to water?

Answer 1

A rise in temperature

Question 2

A piece of limestone is heated so a thermal decomposition reaction takes place. It is then reacted with water to give limewater. A student uses this limewater in an experiment and it turns cloudy. What does this tell the student about what is happening in the experiment?

Answer 2

There is carbon dioxide present

Question 3

Limestone is an ionic compound formed from calcium and carbonate ions. Given that the formula of calcium carbonate is CaCO3, what is the charge on the carbonate ion?

Answer 3

-2

Question 4

What would be the products if a piece of limestone were heated so that a thermal decomposition reaction took place?

Answer 4

Calcium oxide + carbon dioxide

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Question 5

A student carries out a thermal decomposition reaction of limestone. She takes the solid product and reacts it with water to produce a solution. The student then measures the pH of the solution. What would you expect the pH to be?

Answer 5

Greater than 7