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Some Common Changes

A physical ch...

Question

A physical change involves a change in the state of the substance.

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True

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B

False

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Solution

The correct option is A True
When a material undergoes a change in shape, size or state it is called a physical change. Generally, no new substance is formed in a physical change. For example change of state of water from solid to liquid or liquid to gas is a physical change as only state of water is changing and no new substance is formed.

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Q. Boiling involves change in the physical state of 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.

In a chemical change, the properties that change are :

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. Assertion :Physical change of a substance involves change in all properties and composition of its molecules Reason: The change of a substance with alteration of composition of its molecules without any change in its specific property is called physical change

Q. Is burning of a substance always a chemical change? Explain how burning of candle involves both physical and chemical change.

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Some Common Changes

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