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Standard VII
Chemistry
Chemical Change
Question

During a chemical change :
  1. atoms change.
  2. atoms recombine to form different substances.
  3. none of these
  4. a substance remain the same chemically.

A
atoms change.
B
a substance remain the same chemically.
C
atoms recombine to form different substances.
D
none of these
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Solution
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Atoms of substances never change, they just combine and recombine to form different substances during a chemical change. Hence during a chemical change the chemical composition of the substance changes.

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Similar Questions
Q1
Which of these is a chemical change?

(a) A substacne with different chemical properties is formed.
(b) A substance in a different state but similar chemical properties is formed.
(c) The molecules of the substances do not undergo any change.
(d) A substance with a different shape and size but similar chemical properties is formed.
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Q2

One of the following does not happen during a chemical reaction. This is :

(a) Breaking of old chemical bonds and formation of new chemical bonds

(b) Formation of new substances with entirely different properties

(c) Atoms of one element change into those of another element to form new products.

(d) A rearrangement of atoms takes place to form new products.

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Q3

What happens to the chemical composition of the original substance during a chemical change?

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Q4
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 :

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Q5
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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