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Physical and Chemical Changes

Heat gain or ...

Question

Heat gain or heat loss from the substance can bring which of the following changes ?

A

Change of state

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B

Change in size

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C

Change in chemical nature

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D

All of the above

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Solution

The correct option is D All of the above
Most matter expands when heated and contracts when cooled. For exp :
$(1)$ A thick glass cracking when hot water is poured on to it.
$(2)$ Hot ballons uses the expansion of gases filled with heated air.
$(3)$ When baking powder is added to a cake, $C O_{2}$ is released from baking powder and causing dough to rise.
Hence, the answer is change of state, change in size and change in chemical nature.

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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 :

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A chemical change refers to a change which is permanent in nature and results into the formation of new substance which is different from the original substance.

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.

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, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

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Q. Following are the observations of changes that have taken place. Classify them into chemical change or a physical change. [5 MARKS]

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