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Worksheetschemical reactions and equation s
Total questions: 20
Worksheet time: 14mins
Look at the chemical equation.
Is it written correctly to show the Law of Conservation of Mass?
Yes
No
14. In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of
(a)
13. A white precipitate can be obtained by adding dilute sulphuric acid to
CuSO4 solution
NaCl solution
BaCl2 solution
Na2SO4 solution
12.The chemical reaction involved in the corrosion of iron metal is that of
Oxidation as well as displacement
Reduction as well as combination
Oxidation as well as combination
Reduction as well as displacement
10.In a context of redox reactions, the removal of hydrogen from a substance is known as
Oxidation
Reduction
Dehydration
Dehydrogenation
9.The removal of oxygen from a substance is called
Oxidation
Corrosion
Rancidity
Reduction
7.One of the following is an exothermic reaction. This is
Electrolysis of water
Conversion of limestone into quicklime
Process of respiration
Process of photosynthesis
5.The chemical reaction between quicklime and water is characterized by
Evolution of hydrogen gas
Formation of slaked lime precipitate
Change in temperature of mixture
Change in colour of the product
ou are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of potassium -----------------------
(a)
Which of the following is not a physical change?
Boiling of water to give water vapour
Melting of ice to give water
Dissolution of salt in water
Combustion of Liquefied Petroleum Gas (LPG)
A reddish brown coloured metal used in electric wires,
when powdered and heated strongly in an open China
dish, its colour turns black. When hydrogen gas is
passed over this black substances, it regain its original
colour. Based on this information, the metal and black
coloured substances are
copper and copper nitrate
silver and silver oxide
copper and copper oxide
aluminium and aluminium oxide
What happens when copper rod is dipped in iron
sulphate solution?
Copper displaces iron
Blue colour of copper sulphate solution is obtained
No reaction takes place
Reaction is exothermic
A balanced chemical equation is in accordance with-
Avogadro’s law
law of multiple proportion
law of conservation of mass
law of gaseous volumes
A substance which oxidises itself and reduces other is
known as -
oxidising agent
reducing agent
both of these
none of these
