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Physical and Chemical Changes

Which of the ...

Question

Which of the following are true about heating water?

A

It is an irreversible change.

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B

New substance(s) is/are formed after water is heated.

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C

Change in state.

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D

It is a physical change.

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Solution

The correct options are
C Change in state.
D It is a physical change.
Heating of water is a reversible change. When water is heated, it gets converted from its liquid state to its gaseous state and becomes water vapour. However, there are no new substances formed during this change and is hence a physical change. When water is heated at $100^{o} C$ , it starts boiling.

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Q. Matter undergoes a change. The changes are of two types : Physical and chemical change. A physical change is a change that involves only a change in the physical state of matter.
Its chemical properties remain the same. Usually increasing the temperature of applying pressure or both brings about a physical change. On reversing the condition, i.e., reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible. A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, the chemical and physical properties of the substance is formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance. When zinc carbonate is heated and cooled, the change(s) that are observed are :

Q. In a change, new substances having different molecules are formed. Is the change physical or chemicals?

Q. Matter undergoes a change. The changes are of two types: Physical and chemical change.

A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

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