WAEC (WASSCE) Chemistry · Solutions, energy and chemical change
Chemical kinetics and equilibrium system: WAEC Chemistry Past Questions and Answers
What the WAEC syllabus covers in Chemical kinetics and equilibrium system
Our summary: What makes reactions go faster or slower, collision theory and activation energy, and how reversible reactions reach equilibrium.
- Rate of reactions ((1) Definition of reaction rate. (2) Observable physical and chemical changes: colour, mass, temperature, pH, formation of precipitate etc.)
- Rate of reactions: factors affecting rates ((1) Physical states, concentration/pressure of reactants, temperature, catalysts, light, particle size and nature of reactants. (2) Appropriate experimental demonstration for each factor is required.)
- Rate of reactions: theories of reaction rates ((1) Collision and transition state theories to be treated qualitatively only. (2) Factors influencing collisions: temperature and concentration. (3) Effective collision. (4) Activation energy. (5) Energy profile showing activation energy and enthalpy change.)
- Rate of reactions: analysis and interpretation of graphs (Drawing of graphs and charts.)
- Equilibrium: general principle (Explanation of reversible and irreversible reactions. Reversible reaction i.e. dynamic equilibrium. Equilibrium constant K must be treated qualitatively. It must be stressed that K for a system is constant at constant temperature. Simple experiment to demonstrate reversible reactions.)
- Equilibrium: Le Chatelier's principle (Prediction of the effects of external influence of concentration, temperature, pressure and volume changes on equilibrium systems.)
Syllabus content © The West African Examinations Council (WASSCE (harmonised West African syllabus)).
WAEC (WASSCE) Chemistry questions on Chemical kinetics and equilibrium system
- WAEC 2024According to the collision theory of reaction rates, which of the following conditions is not required for two molecules to react? The molecules must
- WAEC 2024Catalysts alter reaction rates by
- WAEC 2023Which of the following statements about the collision theory is correct?
- WAEC 2023Species that occur in a reaction pathway but not in the overall reaction are known as
- WAEC 2022Before a reaction could take place, there should be
- WAEC 2022Consider the following reaction equation N 2 (g) + 3H 2(g) ⇌ 2NH3(g) ∆H = -92kJ Increasing the temperature of the reaction would
- WAEC 2022If 5.0 g of marble reacts with 25.0 cm3 hydrochloric acid, which of the following combinations has the fastest reaction rate?
- WAEC 2022Which of the following statements about an equilibrium system is correct?
- WAEC 2020Which of the following statements is correet for a reaction at equilibrium?
- WAEC 2020Equal masses of calcium trioxocarbonate(iv) were added to dilute hydrochloric acid at the temperature specified. Under which of the following conditions would…
- WAEC 2019consider the reaction represented by the following equation: 2SO 2 + O 2 ⇌ 2SO 3 A decrease in the pressure of the reaction would
- WAEC 2019If a catalyst is added to a system, the temperature and the pressure remain constant, there would be no effect on the?
- WAEC 2018The position of equilibrium in a reversible reaction is affected by
- WAEC 2018Consider the following equilibrium reaction: 2AB 2 (g) + B 2 (g) 2AB 3 (g) . H= -X kJmol^ -1 . The backward reaction will be favored by
- WAEC 2017The property of a chemical reaction that is affected by the presence of a catalyst is
- WAEC 2017Chemical reactions occurs when the colliding reactants have energy that is
- WAEC 2016The minimum amount of energy required for effective collisions between reacting particles is known as
- WAEC 2016Which of the following factors will affect the rate of the reaction represented by the following equation? 2HCl(aq) + CaCO3(s) CaCl2(aq) + H2O(1) + CO2(g) I…
- WAEC 2016Chemical equilibrium is attained when
- WAEC 2015Consider the following equilibrium system: 2SO2(g) + O2(g) 2SO3(g) The addition of more O2(g) to the system will shift the equilibrium position to the
- WAEC 2014Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆Hϴ = -xkJ mol^ -1 . Which of the following conditions would increase the…
- WAEC 2014Which of the following statements about a chemical system in equilibrium is correct/ The
- WAEC 2014Which of the following factors would affect the equilibrium constant?
- WAEC 2013Consider the reaction represented by the equation: N 2 O 4 (g) ⇌ 2NO 2 (g) ; ∆H = + x kJ mol^ -1 What happens when the temperature is reduced at equilibrium?
- WAEC 2012Consider the reaction represented by the following equation: CuO (s) + H 2 SO 4(aq) → CuSO 4(aq) + H 2 O (l) . Which of the following factors will not affect…
- WAEC 2011Consider the following reaction equation: X(g) + Y(g) ⇌ XY(g); ∆H = + 220KJ mol^ -1 If the temperature of the system is increased, the
- WAEC 2010The rate of chemical reaction of solids are not affected by
- WAEC 2010The minimum amount of energy required for effective collisions between reacting particles is known as
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