Lab: Physical and Chemical Changes

Question 2 • FL-2003350-Chemistry 1 Honors Sem 1 - Flex

Which answer below correctly identifies the type of change and the explanation for the mixture of calcium carbonate and hydrochloric acid?

Answer

physical change because even though gas formation was observed, the calcium carbonate retained its original properties

physical change because even though a particle size change was observed, the calcium carbonate retained its original properties

chemical change because gas formation was observed, which indicated that the calcium carbonate was transformed into a different substance

chemical change because a particle size change was observed, which indicated that the calcium carbonate was transformed into a different substance

Explanation

Calcium carbonate reacts with hydrochloric acid to form new substances, including carbon dioxide gas, water, and calcium chloride. The observed gas formation is evidence of a chemical change because the calcium carbonate is transformed into different substances. A change in particle size alone would not show that a new substance formed.

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