Chapter 2, Problem 14A

Interpretation Introduction

Interpretation:

The conditions of chemical changehave to be stated.

Concept Introduction:

Matter has both physical and chemical properties.

Chemical properties are defined as the ability of a substance to transform into another different substance.

A chemical change involves the change of a substance into other new substances.

Answer to Problem 14A

The five conditions of chemical change:

1. change in color
2. formation of a precipitate
3. formation of a gas
4. change in smell
5. temperature change

Explanation of Solution

1. Change in color: A change in color is an indicationof a chemical change.
2. Formation of a precipitate: Sometimes a precipitate can be formedby mixing two liquids which is an indication of a chemical change.
3. Formation of a gas: The formation of gas bubbles during a chemical change is an indication.
4. Change in smell: Change in smell is an indication of chemical change. An odorless substance can change into another substance with bad smell.
5. Temperature change: Most of the chemical changes are associated with gain or release of temperature.