Question

Limestone is a common form of calcium carbonate. When limestone is subjected to high heat, it becomes calcium oxide and releases carbon dioxide gas. This change in limestone, at a given temperature, is an example of:

A. a physical change like the melting of ice

B. a chemical change like the rusting of iron

C. an igneous change like the melting of rock in a volcano

D. a reversible change such as hardening melted butter

Answer 1

The answer is C.an igneous change like the melting of rock in a volcano

Answer 2

The change in limestone at high temperature is an example of a chemical change like the rusting of iron.

I want us to understand that a chemical change is said to occur when there is a change in the composition of a substance. We must also note that a chemical change is not easily reversible once it occurs. New substances are formed in a chemical change.

Considering the decomposition of limestone, two new substances are formed, carbon dioxide and calcium oxide. This is a chemical change just like the rusting of iron.

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