Chapter 7.1, Problem 3RQ

Interpretation Introduction

Interpretation: Whether a chemical reaction has taken place in the following process or not should be determined:

Concept Introduction: The properties of the substance that are observed due to change in the chemical composition of the substance is said to be the chemical change. The evidences for the chemical changes are:

• Change in color.
• Formation of precipitation.
• Evolution or absorption of heat.
• Change in odor.
• Formation of bubbles.

Answer to Problem 3RQ

The chemical reaction has taken place in the given process.

Explanation of Solution

The given process indicates the burning of wick of the candle that results in the evolution of heat and light. Hence, the chemical reaction has taken place in the given process

Interpretation Introduction

Interpretation: Whether a chemical reaction has taken place in the following process or not should be determined:

Concept Introduction: The properties of the substance that are observed due to change in the chemical composition of the substance is said to be the chemical change. The evidences for the chemical changes are:

• Change in color.
• Formation of precipitation.
• Evolution or absorption of heat.
• Change in odor.
• Formation of bubbles.

Answer to Problem 3RQ

The chemical reaction has taken place in the given process.

Explanation of Solution

The given process indicates the burning of matchstick that results in the evolution of heat and light. Hence, the chemical reaction has taken place in the given process

Interpretation Introduction

Interpretation: Whether a chemical reaction has taken place in the following process or not should be determined:

Concept Introduction: The properties of the substance that are observed due to change in the chemical composition of the substance is said to be the chemical change. The evidences for the chemical changes are:

• Change in color.
• Formation of precipitation.
• Evolution or absorption of heat.
• Change in odor.
• Formation of bubbles.

Answer to Problem 3RQ

The chemical reaction has taken place in the given process.

Explanation of Solution

The given process indicates the dropping of a tablet in water. When a tablet comes in contact to water it results in the formation of bubbles. Hence, the chemical reaction has taken place in the given process.

Interpretation Introduction

Interpretation: Whether a chemical reaction has taken place in the following process or not should be determined:

Concept Introduction: The properties of the substance that are observed due to change in the chemical composition of the substance is said to be the chemical change. The evidences for the chemical changes are:

• Change in color.
• Formation of precipitation.
• Evolution or absorption of heat.
• Change in odor.
• Formation of bubbles.

Answer to Problem 3RQ

The chemical reaction has taken place in the given process.

Explanation of Solution

The given process indicates the brown color on the apple. The formation of brown color on the cut cells of apple takes place on the exposure of air. Hence, the chemical reaction has taken place in the given process.