Question

Revision work

Class 7 SCIENCE

Q1 Write the chemical symbols of the following

Elements:

Hydrogen

Sodium

Magnesium

Aluminium

Calcium

Potassium

Iron

Q2 Write the symbols of the following compounds:

Water

Calcium carbonate

Aluminium sulphate

Sodium oxide

Copper sulphate

Hydrochloric acid

Magnesium hydroxide

Sodium chloride

Q3 Write the symbols of following ions:

Sodium

Magnesium

Aluminium

Calcium

Hydrogen

Copper

Iron

Zinc

Q4 Write the balanced equations for the following

Word equations:​

Answer 1

Answer:Q.1Hydrogen=H

Sodium=Na

Magnesium=Mg

Aluminum=Al

Calcium=Ca

Potassium=K

Iron=Fe

Q.2

water=H2O

calcium carbonate=CaCo3

aluminum sulphate=Al2(SO)4

sodium oxide=Na2O

copper sulphate=CuSO4

hydrochloric acid=HCL

magnesium hydroxide=Mg(OH)2

sodium chloride=NaCl

Q.3

sodium=Na

magnesium=Mg

aluminum=Al

calcium=Ca

hydrogen=H

copper=Cu

iron=Fe

zinc=Zn

hope it is helpful

Answer 2

Answer:

Q1 ans H

SO

MG

AL

C

P

I

Q2 ans H2O

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