Question

Q 1.How are we different? (Any 1)

(a) Physical change and chemical change

(b) Metals and non-metals.

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Answer 1

Answer:

a) Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

b)Metals:

1) shiny in nature ( lustrous)

2) good conductor of heat and electricity

3) high melting point And the density

4) it can lose the electron

5) all metals are in the solid state at roomtemperature except mercury which is in the liquid state

Non-metals:

1) poor conductor of heat and electricity except graphite

2) non-ductile metal and brittle solid

3) may be sold, liquid and gases at room temperature

4) these are not sonorous

5) easily gain of an electron

Hope will be helpful ☺️

Answer 2

Explanation:

Physical Changes:- the changes which occurs physically and can be reversed. And affecting the form of chemical substances not the chemical composition.

Chemical changes:- the changes which occurs chemically and can not be reversed.And affecting the chemical composition of substances.