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Chemical Change

In a - change...

Question

In a ___ change, the molecular structure of a matter changes and a new substance is formed.

A

Physical

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B

Chemical

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C

Both A and B

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D

None of these

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Solution

The correct option is B
Chemical

In a chemical change, the molecular structure of a matter changes and a new substance is formed.It is permanent and irreversible.

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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 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. Statement (1) : Composition and molecular structure of the reactants can be changed by having a chemical change.
BECAUSE
Statement (2) : It is said to be a chemical reaction when new substances and new bonds are formed and old bonds are broken.

Q. Write one word for the following

1.	A change that can be reversed	.....................
2.	A change that cannot be reversed	.....................
3.	A change where no new substance is formed	.....................
4.	A change where a new substance is formed	.....................

Fill in the blanks with suitable word..

A ..................change is a change in which a new substance is formed whose properties are different from those of the original substances.

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