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Physical and Chemical Changes

A blacksmith ...

Question

A blacksmith grinds edges of iron axe against a spinning wheel to sharpen it. Sparks of fire and heat are generated. We can conclude that -

A

It is chemical change as heat is generated

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B

It is physical change as only shape of axe changes

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C

Its physical change as iron turns into new metal

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D

It involves both physical and chemical changes

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Solution

The correct option is B It is physical change as only shape of axe changes
Physical changes are the changes in which only shapes of substance changes. There is no change in chemical composition in the physical changes. By grinding iron does not change it into any other metal or any other substance is not formed.
By grinding the edges of iron axe against a spinning wheel only the shape of the axe is changing. Hence it is a physical change.

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Similar questions

A blacksmith grinds the edges of an iron axe against a spinning wheel to sharpen it. Sparks of fire and heat are generated. We can say that it is a:

The rusting of an iron object is called:

(a) corrosion and it is a physical as well as a chemical change

(b) dissolution and it is a physical change

(c) corrosion and it is a chemical change

(d) dissolution and it is a chemical change

Q. Question 2
Rusting of an article made up of iron is called

(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change

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 :

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