AQA CHEMISTRY PAPER 2 – QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
• Core Domains *
•
o Rate and Extent of Chemical Change *
•
o Organic Chemistry *
•
o Chemical Analysis *
•
o Chemistry of the Atmosphere *
•
o Using Resources *
•
o Practical Skills and Data Analysis *
• Introduction *
• The purpose of this comprehensive assessment is to rigorously evaluate mastery of
the AQA Chemistry Paper 2 specification. This exam measures critical understanding
across foundational theory, organic mechanisms, environmental pathways, and
analytical methodologies. Candidates are assessed on their quantitative reasoning,
data interpretation, and practical experimentation protocols through multiple-choice
and scenario-based queries. The assessment emphasizes real-world industrial and
environmental applications, requiring advanced decision-making and critical thinking
to solve complex chemical problems. Candidates must demonstrate deep analytical
capacity to secure a verified passing standard. *
Section One: Questions 1–100
Question 1
A student monitors the rate of reaction between calcium carbonate and dilute hydrochloric
acid by measuring the volume of carbon dioxide gas produced. Which alteration will increase
the initial rate of reaction without changing the final volume of gas collected?
A. Increasing the mass of calcium carbonate while keeping the acid volume and
concentration constant
,B. Increasing the temperature of the hydrochloric acid solution
C. Decreasing the concentration of the hydrochloric acid solution
D. Using larger lumps of calcium carbonate
B. Increasing the temperature of the hydrochloric acid solution
Explanation: Increasing the temperature increases the kinetic energy of the particles,
leading to more frequent collisions and a higher proportion of collisions having energy
greater than or equal to the activation energy. This increases the rate of reaction without
affecting the yield, as the limiting reactant amounts remain unchanged.
Question 2
Which of the following statements correctly describes a system at dynamic equilibrium?
A. The mass of the products is exactly equal to the mass of the reactants
B. The forward and reverse reactions have completely stopped
C. The concentrations of reactants and products remain constant because the forward and
reverse reactions occur at the same rate
D. The activation energy of the forward reaction equals the activation energy of the reverse
reaction
C. The concentrations of reactants and products remain constant because the forward
and reverse reactions occur at the same rate
Explanation: Dynamic equilibrium is achieved in a closed system when the rate of the
forward reaction equals the rate of the reverse reaction, meaning chemical changes are still
occurring but concentrations show no net change.
Question 3
Industrial ethanol is widely produced by the hydration of ethene. What are the standard
reaction conditions required for this reversible industrial process?
A. 300°C, 60–70 atm, concentrated phosphoric acid catalyst
B. 450°C, 200 atm, iron catalyst
C. 200°C, 1 atm, nickel catalyst
D. 100°C, 250 atm, concentrated sulfuric acid catalyst
A. 300°C, 60–70 atm, concentrated phosphoric acid catalyst
Explanation: The industrial hydration of ethene to produce ethanol requires a
temperature of 300°C, a pressure of 60–70 atmospheres, and a solid phosphoric acid
,(𝐻3 𝑃𝑂4) catalyst to achieve an optimum compromise between reaction rate and equilibrium
yield.
Question 4
What is the functional group characteristic of carboxylic acids?
A. -OH
B. -COO-
C. -CHO
D. -COOH
D. -COOH
Explanation: Carboxylic acids contain the carboxyl functional group (-COOH), which
consists of a carbon atom double-bonded to an oxygen atom and single-bonded to a
hydroxyl group.
Question 5
A sample of an unknown hydrocarbon turns bromine water from orange-brown to colorless.
What does this observation signify about the structure of the hydrocarbon?
A. It is a saturated alkane
B. It contains at least one carbon-carbon double bond
C. It is a long-chain alcohol
D. It consists entirely of single covalent bonds
B. It contains at least one carbon-carbon double bond
Explanation: Alkenes undergo an addition reaction with bromine water because they are
unsaturated, containing a carbon-carbon double bond (C = C) that breaks to bond with
bromine atoms, decolorizing the solution.
Question 6
Which analytical test is correctly matched with its positive observation for identifying a
specific gas?
A. Hydrogen – relights a glowing splint
B. Oxygen – burns with a squeaky pop
C. Carbon dioxide – turns limewater cloudy
D. Chlorine – turns damp red litmus paper blue
, C. Carbon dioxide – turns limewater cloudy
Explanation: Carbon dioxide reacts with aqueous calcium hydroxide (limewater) to form
an insoluble precipitate of calcium carbonate, turning the solution cloudy or milky.
Question 7
During the fractional distillation of crude oil, which property determines the level at which a
specific hydrocarbon fraction condenses in the fractionating column?
A. Chemical reactivity
B. Boiling point
C. Density in the liquid phase
D. Solubility in water
B. Boiling point
Explanation: The fractionating column operates on a temperature gradient (hot at the
bottom, cooler at the top). Hydrocarbons condense at the height corresponding to their
specific boiling points, which depend on their molecular chain lengths.
Question 8
What was the primary gas responsible for forming the Earth’s early atmosphere according to
scientific theories regarding volcanic activity?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Methane
C. Carbon dioxide
Explanation: Intense volcanic activity in the Earth’s first billion years released large
amounts of carbon dioxide, along with water vapor and nitrogen, forming the early
atmosphere.
Question 9
Which statement accurately describes the environmental impact of sulfur dioxide (𝑆𝑂2)
emissions from burning fossil fuels?
A. It causes global dimming by reflecting sunlight
B. It reacts with water vapor in clouds to form acid rain
ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
• Core Domains *
•
o Rate and Extent of Chemical Change *
•
o Organic Chemistry *
•
o Chemical Analysis *
•
o Chemistry of the Atmosphere *
•
o Using Resources *
•
o Practical Skills and Data Analysis *
• Introduction *
• The purpose of this comprehensive assessment is to rigorously evaluate mastery of
the AQA Chemistry Paper 2 specification. This exam measures critical understanding
across foundational theory, organic mechanisms, environmental pathways, and
analytical methodologies. Candidates are assessed on their quantitative reasoning,
data interpretation, and practical experimentation protocols through multiple-choice
and scenario-based queries. The assessment emphasizes real-world industrial and
environmental applications, requiring advanced decision-making and critical thinking
to solve complex chemical problems. Candidates must demonstrate deep analytical
capacity to secure a verified passing standard. *
Section One: Questions 1–100
Question 1
A student monitors the rate of reaction between calcium carbonate and dilute hydrochloric
acid by measuring the volume of carbon dioxide gas produced. Which alteration will increase
the initial rate of reaction without changing the final volume of gas collected?
A. Increasing the mass of calcium carbonate while keeping the acid volume and
concentration constant
,B. Increasing the temperature of the hydrochloric acid solution
C. Decreasing the concentration of the hydrochloric acid solution
D. Using larger lumps of calcium carbonate
B. Increasing the temperature of the hydrochloric acid solution
Explanation: Increasing the temperature increases the kinetic energy of the particles,
leading to more frequent collisions and a higher proportion of collisions having energy
greater than or equal to the activation energy. This increases the rate of reaction without
affecting the yield, as the limiting reactant amounts remain unchanged.
Question 2
Which of the following statements correctly describes a system at dynamic equilibrium?
A. The mass of the products is exactly equal to the mass of the reactants
B. The forward and reverse reactions have completely stopped
C. The concentrations of reactants and products remain constant because the forward and
reverse reactions occur at the same rate
D. The activation energy of the forward reaction equals the activation energy of the reverse
reaction
C. The concentrations of reactants and products remain constant because the forward
and reverse reactions occur at the same rate
Explanation: Dynamic equilibrium is achieved in a closed system when the rate of the
forward reaction equals the rate of the reverse reaction, meaning chemical changes are still
occurring but concentrations show no net change.
Question 3
Industrial ethanol is widely produced by the hydration of ethene. What are the standard
reaction conditions required for this reversible industrial process?
A. 300°C, 60–70 atm, concentrated phosphoric acid catalyst
B. 450°C, 200 atm, iron catalyst
C. 200°C, 1 atm, nickel catalyst
D. 100°C, 250 atm, concentrated sulfuric acid catalyst
A. 300°C, 60–70 atm, concentrated phosphoric acid catalyst
Explanation: The industrial hydration of ethene to produce ethanol requires a
temperature of 300°C, a pressure of 60–70 atmospheres, and a solid phosphoric acid
,(𝐻3 𝑃𝑂4) catalyst to achieve an optimum compromise between reaction rate and equilibrium
yield.
Question 4
What is the functional group characteristic of carboxylic acids?
A. -OH
B. -COO-
C. -CHO
D. -COOH
D. -COOH
Explanation: Carboxylic acids contain the carboxyl functional group (-COOH), which
consists of a carbon atom double-bonded to an oxygen atom and single-bonded to a
hydroxyl group.
Question 5
A sample of an unknown hydrocarbon turns bromine water from orange-brown to colorless.
What does this observation signify about the structure of the hydrocarbon?
A. It is a saturated alkane
B. It contains at least one carbon-carbon double bond
C. It is a long-chain alcohol
D. It consists entirely of single covalent bonds
B. It contains at least one carbon-carbon double bond
Explanation: Alkenes undergo an addition reaction with bromine water because they are
unsaturated, containing a carbon-carbon double bond (C = C) that breaks to bond with
bromine atoms, decolorizing the solution.
Question 6
Which analytical test is correctly matched with its positive observation for identifying a
specific gas?
A. Hydrogen – relights a glowing splint
B. Oxygen – burns with a squeaky pop
C. Carbon dioxide – turns limewater cloudy
D. Chlorine – turns damp red litmus paper blue
, C. Carbon dioxide – turns limewater cloudy
Explanation: Carbon dioxide reacts with aqueous calcium hydroxide (limewater) to form
an insoluble precipitate of calcium carbonate, turning the solution cloudy or milky.
Question 7
During the fractional distillation of crude oil, which property determines the level at which a
specific hydrocarbon fraction condenses in the fractionating column?
A. Chemical reactivity
B. Boiling point
C. Density in the liquid phase
D. Solubility in water
B. Boiling point
Explanation: The fractionating column operates on a temperature gradient (hot at the
bottom, cooler at the top). Hydrocarbons condense at the height corresponding to their
specific boiling points, which depend on their molecular chain lengths.
Question 8
What was the primary gas responsible for forming the Earth’s early atmosphere according to
scientific theories regarding volcanic activity?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Methane
C. Carbon dioxide
Explanation: Intense volcanic activity in the Earth’s first billion years released large
amounts of carbon dioxide, along with water vapor and nitrogen, forming the early
atmosphere.
Question 9
Which statement accurately describes the environmental impact of sulfur dioxide (𝑆𝑂2)
emissions from burning fossil fuels?
A. It causes global dimming by reflecting sunlight
B. It reacts with water vapor in clouds to form acid rain
