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Chemical Equilibrium

Which of the ...

Question

Which of the following is correct regarding a chemical reaction?

A

New substances are formed.

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B

Chemical properties of matter change.

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C

One substance reacts with another to undergo change in chemical composition.

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D

All of the given options.

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Solution

The correct options are
A
New substances are formed.

B
Chemical properties of matter change.

C
One substance reacts with another to undergo change in chemical composition.

D
All of the given options.

In a chemical reaction, one substance reacts with another to undergo a change in chemical composition to form a new substance. Chemical properties of the entities change in the reaction.

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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. Which of the following is not a feature of chemical change?

(I) Original substance can be obtained by simple physical methods.
(II) It is a temporary change.
(III) The new substances formed have properties different from those of the reacting substances.

Q. Which of the following statements are correct with respect to chemical reactions?
(i) Chemical composition of original substance changes
(ii) Formation of new substances takes place
(iii) Original substances can be obtained back from the new substances

Q. 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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