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Chemical Reactions

Define: ii a ...

Question

Define:
(ii) a chemical change

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Solution

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

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Similar questions

Define :

(a) a physical change

(b) a chemical change

Q. Define physical and chemical change and give two suitable examples for each.

Q. Match column I with column II and select the correct option from the codes given below.

Column I	Column II
(P) Expansion of metals on heating	(i) Neither physical nor chemical change
(Q) A stone kept in the sunlight	(ii) Chemical change
(R) Burning of a candle	(iii) Combination of physical nor chemical changes
(S) Curdling of milk	(iv) Physical change

Q. Balanced chemical equations imply which of the following?

I

. Numbers of molecules are conserved in chemical change

I I

. Numbers of atoms are conserved in chemical change.

I I I

. Mass is conserved in chemical change.

Anaerobic bacteria digest animal waste and produce biogas (Change − A).

The biogas is then burnt as fuel (Change − B). The following statements pertain to these changes. Choose the correct one.

(i) Process − A is a chemical change.

(ii) Process − B is a chemical change.

(iii) Both processes A and B are chemical changes.

(iv) None of these processes is a chemical change.

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Chemical Reactions

Standard VIII Chemistry

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