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1.1 A reaction in which products can be converted back to reactants is described as: A) Heterogeneous B) Homogeneous C) Reversible D) Spontaneous 1.2 Which ONE of the following reaction conditions applies to esterification? A) Heat reaction mixture mildly over a water bath B) Apply heat directly to the reaction mixture C) Add concentrated hydrochloric acid to the reaction mixture D) Apply mild heat directly to the reaction mixture 1.3 What NAME is given to the process of breaking down long chain hydrocarbons into more shorter chains? A) Hydrogentation B) Cracking C) Dehydrogenation D) Isomerisation 1.4 Which ONE of the following changes will increase the rate of production of H2(g) in the reaction: Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g) A) Increase in pressure by decreasing the volume B) Add water to the reaction mixture C) Increase the volume of the H2SO4(aq) D) Increase the concentration of the H2SO4(aq) 1.5 Consider the reversible reaction: 3 Y2(g) ⇌ 2 Y3(g) ΔH = -80 kJ If the activation energy for the reverse reaction is 180 kJ, then the activation energy for the forward reaction is … - NSC Physical Sciences - Question 1 - 2016 - Paper 2
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1.1 A reaction in which products can be converted back to reactants is described as: A) Heterogeneous B) Homogeneous C) Reversible D) Spontaneous 1.2 Which ONE of t... show full transcript
Worked Solution & Example Answer:1.1 A reaction in which products can be converted back to reactants is described as: A) Heterogeneous B) Homogeneous C) Reversible D) Spontaneous 1.2 Which ONE of the following reaction conditions applies to esterification? A) Heat reaction mixture mildly over a water bath B) Apply heat directly to the reaction mixture C) Add concentrated hydrochloric acid to the reaction mixture D) Apply mild heat directly to the reaction mixture 1.3 What NAME is given to the process of breaking down long chain hydrocarbons into more shorter chains? A) Hydrogentation B) Cracking C) Dehydrogenation D) Isomerisation 1.4 Which ONE of the following changes will increase the rate of production of H2(g) in the reaction: Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g) A) Increase in pressure by decreasing the volume B) Add water to the reaction mixture C) Increase the volume of the H2SO4(aq) D) Increase the concentration of the H2SO4(aq) 1.5 Consider the reversible reaction: 3 Y2(g) ⇌ 2 Y3(g) ΔH = -80 kJ If the activation energy for the reverse reaction is 180 kJ, then the activation energy for the forward reaction is … - NSC Physical Sciences - Question 1 - 2016 - Paper 2
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1.4 Which ONE of the following changes will increase the rate of production of H2(g) in the reaction: Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g)
Answer
The correct answer is D) Increase the concentration of the H2SO4(aq). This would provide more reactant per unit volume, thus increasing the reaction rate.
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1.5 Consider the reversible reaction: 3 Y2(g) ⇌ 2 Y3(g) ΔH = -80 kJ If the activation energy for the reverse reaction is 180 kJ, then the activation energy for the forward reaction is ….
Answer
The correct answer is B) 80 kJ. The activation energy of the forward reaction can be deduced by using the relationship between activation energies and the enthalpy change of the reaction.
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1.9 Consider the following reaction that is at equilibrium in a closed container: CoCl2(aq) + 6H2O(l) ⇌ Co(H2O)6²⁺(aq) + 4Cl⁻(aq) ΔH < 0 What will be observed when a few drops of concentrated hydrochloric acid are added to the equilibrium mixture?
Answer
The correct answer is A) The solution turns pink. Adding HCl will shift the equilibrium to the left due to the increased concentration of Cl⁻ ions.
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1.10 Distilled water ionizes according to the following equation: 2 H2O(l) ⇌ H3O⁺(aq) + OH⁻(aq) Which statement is TRUE about distilled water as temperature increases from 25 °C to 40 °C?
Answer
The correct answer is A) The water becomes acidic. As temperature increases, the ionization equilibrium shifts, increasing the concentration of H3O⁺.