CLASS-10 WORKSHEET
CHEMICAL REACTIONS AND EQUATIONS
1. Give 5 examples each of physical and chemical changes that take
place around us in our day to day life.
2. When a magnesium ribbon is burnt in air, what are the two
observations that you make?
3. Write a balanced chemical equation to represent decomposition
of lead nitrate on heating. What are brown fumes due to?
4. write the chemical formulae of:-
(i) Barium chloride (ii) Sodium Sulphate (iii) Ammonium
phosphate (iv) Calcium hydroxide
(v) Aluminium carbonate (vi) Magnesium hydrogen carbonate
(vii) Zinc sulphide
(viii) copper (׀) chloride (ix) Potassium Bromide (x) Lead
nitrate (xi) Iron ( ׀׀׀) oxide (xii) Sodium Oxide (xiii) Silver sulphide
(xiv) Calcium Fluoride
5. Write the following in the form of balanced chemical
equations:-
(a) Calcium carbonate decomposes on heating to form calcium
oxide and carbon – di – oxide.
(b) When ammonium hydroxide is added to a solvent of iron
(ll) Sulphate, a green ppt of iron (ll) hydroxide and ammonium Sulphate
are formed.
(c) When a nail of iron is added to a solution of copper
Sulphate, iron (ll) Sulphate and copper metal are formed.
(d) Zinc reacts with dil hydrochloric acid to form zinc
chloride and hydrogen gas is liberated.
6. A chemical reaction which is both combination as well as
exothermic, is used by us for white washing purposes. Write the equation
for the same.
7. What is a decomposition reaction? Give 2 examples each of
decomposition taking place due to heat, light and electricity.
8. How does a displacement reaction differ from a double
displacement reaction? Give examples to explain.
