Chapter 1, Problem 4P

Interpretation Introduction

(a)

Interpretation:

The burning of gasoline should be classified as chemical or physical change.

Concept Introduction:

Physical change:

If a compound or substance changes its state and that is reversible in nature then such change known as physical change.

Chemical change:

If a compound or substance changes its state and cannot be converted into its original form that change is known as chemical change and it is irreversible in nature.

Interpretation Introduction

(b)

Interpretation:

The making of ice cubes should be classified as chemical or physical change.

Concept Introduction:

Physical change:

If a compound or substance changes its state and that is reversible in nature then such change known as physical change.

Chemical change:

If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.

Interpretation Introduction

(c)

Interpretation:

The boiling of oil should be classified as chemical or physical change.

Concept Introduction:

Physical change:

If a compound or substance changes its state and that is reversible in nature then such change known as physical change.

Chemical change:

If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.

Interpretation Introduction

(d)

Interpretation:

The melting of lead should be classified as chemical or physical change.

Concept Introduction:

Physical change:

If a compound or substance changes its state and that is reversible in nature then such change known as physical change.

Chemical change:

If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.

Interpretation Introduction

(e)

Interpretation:

The rusting of iron should be classified as chemical or physical change.

Concept Introduction:

Physical change:

If a compound or substance changes its state and that is reversible in nature then such change known as physical change.

Chemical change:

If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.

Interpretation Introduction

(f)

Interpretation:

The formation of ammonia from nitrogen and hydrogen should be classified as chemical or physical change.

Concept Introduction:

Physical change:

If a compound or substance changes its state and that is reversible in nature then such change known as physical change.

Chemical change:

If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.

Interpretation Introduction

(g)

Interpretation:

The digesting of food should be classified as chemical or physical change.

Concept Introduction:

Physical change:

If a compound or substance changes its state and that is reversible in nature then such change known as physical change.

Chemical change:

If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.