Concept explainers
(a)
Interpretation:
Whether the dew condensing on a leaf can be reversed by changing the temperature or not is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. The atoms or the molecules of a substance do not change their identity when a substance undergoes a physical change. The substance remains the same before and after the change. Physical change brings change in physical properties only. For example, the melting of ice is a physical change.
The physical change can be represented as follows:
The change that takes place in the composition is known as chemical change. The atoms or the molecules of the substance rearrange and transformed into a new substance. A chemical change can change physical as well as chemical properties of a substance. For example, the burning of paper is a chemical change.
The representation of chemical change is as follows:
(b)
Interpretation:
Whether an egg turning hard due to boiling can be reversed by changing the temperature or not is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. The atoms or the molecules of a substance do not change their identity when a substance undergoes a physical change. The substance remains the same before and after the change. Physical change brings change in physical properties only. For example, the melting of ice is a physical change.
The physical change can be represented as follows:
The change that takes place in the composition is known as chemical change. The atoms or the molecules of the substance rearrange and transformed into a new substance. A chemical change can change physical as well as chemical properties of a substance. For example, the burning of paper is a chemical change.
The representation of chemical change is as follows:
(c)
Interpretation:
Whether the melting of ice cream can be reversed by changing the temperature or not is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. The atoms or the molecules of a substance do not change their identity when a substance undergoes a physical change. The substance remains the same before and after the change. Physical change brings change in physical properties only. For example, the melting of ice is a physical change.
The physical change can be represented as follows:
The change that takes place in the composition is known as chemical change. The atoms or the molecules of the substance rearrange and transformed into a new substance. A chemical change can change physical as well as chemical properties of a substance. For example, the burning of paper is a chemical change.
The representation of chemical change is as follows:
(d)
Interpretation:
Whether a spoonful of the batter cooking on a hot griddle can be reversed by changing the temperature or not is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. The atoms or the molecules of a substance do not change their identity when a substance undergoes a physical change. The substance remains the same before and after the change. Physical change brings change in physical properties only. For example, the melting of ice is a physical change.
The physical change can be represented as follows:
The change that takes place in the composition is known as chemical change. The atoms or the molecules of the substance rearrange and transformed into a new substance. A chemical change can change physical as well as chemical properties of a substance. For example, the burning of paper is a chemical change.
The representation of chemical change is as follows:
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Chemistry: The Molecular Nature of Matter and Change
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