Question

Pure sodium metal placed in water will spark and ignite, as well as form bubbles and gas. What are the signs that this is a chemical reaction? Check all that apply.

Heat is produced.

Light is produced.

Heat is absorbed.

Bubbles appear.

A precipitate forms.

The color changes.

Answer 1

Heat is produced

Light is produced

Bubbles appear

Answer 2

Answer;

• Heat is produced
• Light is produced
• Bubbles appear

Explanation;

• Chemical reactions involve the chemical interaction of two or more chemical substances, result in a new substance being formed, and are usually irreversible.
• The signs of chemical reactions include gas formation, energy release in the form of light or flame, heat absorption, precipitate formation, and color change.