Question

During chemistry lab, Carl and his lab partner, Mary, mixed four halide salts, one at a time, with silver nitrate. Mary commented that all but one salt reacted chemically with the silver nitrate. Carl asked her how she knew that a chemical reaction had occurred. What was Mary's response based on evidence in this activity?

Answer 1

This should help answer your question.

Answer 2

Mary knew that a chemical reaction has taken place due to the formation of a solid.

A chemical reaction or a chemical change is said to have taken place when a new substance is produced. The following are cues that indicate that a chemical reaction may have taken place;

• Appearance of color
• Appearance of a solid in an aqueous phase reaction
• Evolution of a gas
• Change in temperature of the system

In this case, solids were formed in the reaction of silver nitrate with three of the halide salts. This is an indication that a chemical reaction has taken place.

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