Chapter 1, Problem 1.30QE

(a)

Interpretation Introduction

Interpretation:

A seed growing into a plant has to be defined as a chemical change or a physical change.

Concept Introduction:

Chemical change:

When a substance gets converted to different kinds of matter, it is said to be chemical change.

Physical change:

When a substance undergoes change, without change in its composition, it is said to be physical change.

(b)

Interpretation Introduction

Interpretation:

Distillation of alcohol has to be defined as a chemical change or a physical change.

Concept Introduction:

Refer to part-a.

(c)

Interpretation Introduction

Interpretation:

Mixing an Alka-Seltzer tablet with water has to be defined as a chemical change or a physical change.

Concept Introduction:

Refer to part-a.

(d)

Interpretation Introduction

Interpretation:

Hammering iron into a horseshoe has to be defined as a chemical change or a physical change.

Concept Introduction:

Refer to part-a.