Simple Chemical Reactions
Power machines in factories and vehicles are examples of
combustion
thermal decomposition
evaporation
combination
combustion
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Fuel obtained from fossils is known asA. decayed animal’s oil
B. decayed plant’s extract
C. fossils fuel
D. crude oil
Zinc salt reacts with dilute shulphuric acid to form zinc salt and
A. hydrogen
B. oxygen
C. carbon dioxide
D. carbon monoxide
The process in which reactants react together to form a product, is called
A. chemical reaction
B. chemical change
C. chemical process
D. chemical procedure
At room temperature iron and sulphur
A. do no react
B. react
C. vigorously react
D. somehow react
Irreversible changes include
A. burning of paper
B. rusting of iron
C. corrosion of material
D. all of them
The conservation of mass is obtained when the total mass of reactants is equal to total mass of
A. products
B. molecules
C. protons
D. atoms
The change which is not accompanied by formation of new substance is called a
A. physical change
B. chemical change
C. complex change
D. electrical change
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