In a chemical reaction an oxidising agent will …
A lose protons - NSC Physical Sciences - Question 1 - 2016 - Paper 2
Question 1
In a chemical reaction an oxidising agent will …
A lose protons.
B gain protons.
C lose electrons.
D gain electrons.
Worked Solution & Example Answer:In a chemical reaction an oxidising agent will …
A lose protons - NSC Physical Sciences - Question 1 - 2016 - Paper 2
Step 1
In a chemical reaction an oxidising agent will …
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Answer
An oxidising agent is a substance that gains electrons during a chemical reaction and, in the process, causes another substance to be oxidised. Thus, the correct answer is D: gain electrons.
Step 2
Which ONE of the following statements about the effect of the catalyst is FALSE?
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Answer
The role of the catalyst is to increase the rate of a chemical reaction without undergoing any permanent change itself. Therefore, the false statement is B: The rate of the reverse reaction increases.
Step 3
What product will be formed when an alkene reacts with water vapour (H₂O) in the acid catalyst?
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Answer
The reaction of an alkene with water vapour in the presence of an acid catalyst forms an alcohol. Therefore, the answer is C: Alcohol.
Step 4
Which ONE of the following represents a SUBSTITUTION REACTION?
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Answer
A substitution reaction occurs when a molecule replaces another molecule in a compound. The correct option is B: CH₂=CH₂ + H2O → CH3CH2OH.
Step 5
Which ONE of the following represents the homologous series to which compound I and compound II belong?
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Answer
Compound I and II belong to the alcohol series which is characterized by the presence of the hydroxyl functional group. The answer is D: Aldehydes and Alcohols.
Step 6
Which of the above reactions form(s) part of the Ostwald process?
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Answer
The Ostwald process primarily involves the oxidation of ammonia to form nitric acid, which corresponds to reaction II. Therefore, the answer is B: II only.
Step 7
Which ONE of the following pairs is NOT a conjugate acid-base pair?
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Answer
A conjugate acid-base pair consists of two species that differ by the presence of a proton. The incorrect pair is D: H₂CO₃ and HCO₃⁻, as they do form a conjugate pair.
Step 8
Which ONE of the graphs below shows the relationship between the amount of H₂(g) at equilibrium and the pressure in the container at constant temperature?
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Answer
According to Le Chatelier's principle, increasing pressure favors the side with fewer moles. Therefore, for the reaction at equilibrium, the correct graph is A.
Step 9
Consider the following statements regarding these two reactions:
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Answer
The statement concerning the reactions should be analyzed:
I is true. The initial rate in test tube Y will equal that in test tube X.
II is also true, as more magnesium remains in test tube X.
III is false since different amounts of hydrogen gas will be formed in each tube due to different acid concentrations. Thus, the correct statements are A: I only.
