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5/35 MCQs for:

MATTER: PROPERTIES AND TRANSFORMATION: Rates Of Reaction

According to the collision theory?

Reactant particles must also possess a certain minimum amount of energy called the activation energy (E_A) for a reaction to occur.

Chemical reactions occur due to collisions between reactant particles.

Chemical reactions occur due to collisions between reactant particles and reactant particles must also possess a certain minimum amount of energy called the activation energy (E_A) for a reaction to occur.

None is correct.

A catalyst increases the rate of a chemical reaction by __.

Increasing the activation energy, making it possible for many more reactant particles to cross the energy barrier and collisions between them lead to chemical reactions.

Providing a larger surface area for the reacting gases if the catalyst is a solid.

Lowering the activation energy, making it possible for many more reactant particles to cross the energy barrier and collisions between them lead to chemical reactions.

Lowering the activation energy, making it possible for many more reactant particles to cross the energy barrier and collisions between them lead to chemical reactions and Providing a larger surface area for the reacting gases if the catalyst is a solid.

Example(s) of photochemical reactions include __

Photosynthesis

All are correct

The reaction between methane and chlorine

The reaction between hydrogen and chlorine

In a chemical reaction, the concentrations or amounts of products __

Decrease with time

Increases with time

Does not change with time

None is correct

The following equation represents the thermal decomposition of ammonia
2NH_{3 (g)} → N_{2 (g)} + 3H_{2 (g)} Δ θ = +46KJmol^-1
The rate of the above reaction could be increased by __

All are correct

Increasing the pressure of the reaction system

The use of the catalyst iron will increase the rate of the reaction since the catalyst will lower the activation energy for the reaction

Increasing the temperature will increase the rate of reaction because the reactant particles will gain more kinetic energy are move faster hence colliding more frequently with each other