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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 221:

Which of the following compounds is not correct about the reaction of sodium material for the manufacture of plastics?

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A Ethyne
B Ethane
C Monochloroethene
D Propene
E Butadiene

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Question 222:

The energy required to remove the most loosely bound electron from an atom in the gaseous state is known as the

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A Bond energy
B Ionization energy
C Potential energy
D Activation energy
E Kinetic energy

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Question 223:

Vulcanization of rubber

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A Stops the growth of fungus on the rubber
B Increases the solubility of the rubber
C Decreases the elasticity of the rubber
D Hardnes the rubber through cross-linkage
E Removes sulphur from the rubber

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Question 224:

If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?

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A The reaction vessel gets hotter as the reaction proceeds
B ∆H for the reaction is positive
C The rate of the reaction increases with time
D The activation energy of the reaction is high
E The rate of the reaction increases with time

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Question 225:

If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?

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A The reaction vessel gets hotter as the reaction proceeds
B ∆H for the reaction is positive
C The rate of the reaction increases with time
D The activation energy of the reaction is high
E The rate of the reaction increases with time

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