Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
it is unaffected
it becomes zero
it decrease
it increase
Correct answer is C
This given equation shows the forward reaction is exothermic, which means an increase in temperature will cause the equilibrium position to shift to left to favor reactant formation, i.e K decreases
The graph above demonstrate the effect of?
surface area on the rate of reaction
catalyst on the rate of reaction
pressure on the rate reaction
concentration on the rate of reaction
Correct answer is A
No explanation has been provided for this answer.
lowering the pressure of the reaction
increasing the surface area of the reactant
increase the rate of the reaction
lowering the energy barrier of the reaction
Correct answer is C
- The presence of MnO2 increase the rate of the reaction by providing a new reaction path / making more particles possess kinetic energy greater then the activation energy.
If a reaction is exothermic and there is a great disorder, it means that?
the reaction is static
the reaction is in a state of equilibrium
there will be a large increase in free energy
there will be a large decrease in free energy
Correct answer is D
If a reaction is exothermic and there is a great disorder for a spontaneous reaction to occur, a large decrease in free energy is evident.
In which of the following is the entropy change positive?
Thermal dissociation of ammonium chloride
Reaction between an acid and a base
Addition of concentrated acid to water
Dissolution of sodium metal in water
Correct answer is A
Thermal dissociation of ammonium chloride is an endothermic reaction as heat is absorbed for a positive entropy, with more products than reactants.