Simple Chemical Reactions
The process in which reactants react together to form a product, is called
chemical reaction
chemical change
chemical process
chemical procedure
chemical reaction
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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
Power machines in factories and vehicles are examples of
A. combustion
B. thermal decomposition
C. evaporation
D. combination
Zinc salt reacts with dilute shulphuric acid to form zinc salt and
A. hydrogen
B. oxygen
C. carbon dioxide
D. carbon monoxide
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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