(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.

Question

1.22 A match is lit and held under a cold piece of metal. The followingobservations are made: (a) The match burns. (b) The metal getswarmer. (c) Water condenses on the metal. (d) Soot (carbon) isdeposited on the metal. Which of these occurrences are due tophysical changes, and which are due to chemical changes?

Answer 1

Question

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.

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1.22 A match is lit and held under a cold piece of metal. The followingobservations are made: (a) The match burns. (b) The metal getswarmer. (c) Water condenses on the metal. (d) Soot (carbon) isdeposited on the metal. Which of these occurrences are due tophysical changes, and which are due to chemical changes?

Determine whether each of the following describes aphysical change or a chemical change: (a) The heliumgas inside a balloon tends to leak out after a few hours.(b) A flashlight beam slowly gets dimmer and finallygoes out. (c) Frozen orange juice is reconstituted byadding water to it. (d) The growth of plants depends onthe sun’s energy in a process called photosynthesis.(e) A spoonful of salt dissolves in a bowl of soup.

Identify each process as a physical change or a chemical change. Give the basis for your answer. (a) making of ice cubes (b) burning of LPG (c) tarnishing of silver jewelry (d) melting of ice cubes (e) baking of bread

Answer 2

Question

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.

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Answer 3

Question

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.

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Answer 4

Question

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.

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Answer 5

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.

Answer 6

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.

Answer 7

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.

Answer 8

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.

Answer 9

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.

Answer 10

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.

Answer 11

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.

Answer 12

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.

Answer 13

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.

Answer 14

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.

Answer 15

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.

Answer 16

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.

Answer 17

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.

Answer 18

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.

Answer 19

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.

Answer 20

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