AQA GCSE COMBINED SCIENCE: TRILOGY
8464/C/1F CHEMISTRY PAPER 1F PAPER
& MARK SCHEME PRACTICE
EXAMINATION 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ unsaturated hydrocarbon.
Answer: A hydrocarbon containing a C=C double bond (and not as many
hydrogens as possible).
◍ Rate of reaction graphs.
Answer: - Graph 1, 2 and 3 converge at same levell = produce same amount
of product.- Graph 4 = more product and faster action (this can only happen
if more reactants are added to the start.
◍ Freezing.
Answer: When a liquid cools, the particles have less energy, so move around
lessThere's not enough energy to overcome the attraction between the
particles, so more bonds form between themAt the melting point, so many
bonds have formed between the particles that they're held in place - the
liquid becomes a solid
◍ What is the test for hydrogen?.
Answer: Holding a lit splint of the open end of a test tube containing a gas
◍ What is the relative mass of an electron?.
Answer: Very small
◍ Measuring rate of reaction - Volume of gas given off.
Answer: - A gas syringe is used to measure vol of gas being produced- The
, more gas given off in a given time interval = faster rate
◍ mobile phase.
Answer: substances travel in this phase (usually a solvent)
◍ What is a pure substance?.
Answer: A substance where nothing has been added to it, so it's in its natural
state (contains only one compound or element throughout)
◍ The shorter the hydrocarbon chain....
Answer: - The less viscous (more runny, less gloopy)- The more volatile
(low boiling points = more easily evaporated)- The more flammable
◍ Equation for Number of Moles.
Answer: Number of moles (mol) = Mass (g) of an element/compound / Mr
of the element/compound
◍ What happens in an electrochemical cell?.
Answer: The chemical reactions between the electrodes & the electrolyte set
up a charge difference between the electrodesIf the electrodes are connected
by a wire, the charge is able to flow & electricity is producedA voltmeter
can be connected to the circuit to measure the voltage of the cell
◍ Complete combustion.
Answer: - During combustion both the hydrogen and the carbon are
oxidised.- Hydrocarbons are used as fuels due to the amount of energy
releases after the completion of combustion
◍ What do alkalis form in water?.
Answer: Negative hydroxide ions
◍ State Symbols.
Answer: solid - sliquid - lgas - gaqueous - aq
◍ What's the difference between a burette and a pipette?.
Answer: 1) A burette measures varying volumes2) A pipette measures fixed
volumes
◍ Magnesium and HCl react to produce H2 gas.
, Answer: 1. Add a set volume of dilute HCL to a conical flask and place on
mass balance.2. Add a magnesium ribbon to acid and quickly plug the flask
with cotton wool.3. Start stopwatch and record mass of balance at regular
intervals.4. Plot results in a table and work out mass lost for each reading ->
plot results on a graph.5. Repeat with more concentrated acid solutions.
(Keep control variables like volume of acid and amount of magnesium
ribbon same each time)
◍ Le Chatelier's Principle - Changes to Pressure.
Answer: 1. Changing pressure only effects equilibrium involving gases. 2.
Increase pressure = equilibrium moves in the direction where there are fewer
molecules of gas in attempt to reduce pressure.3. Decrease pressure =
equilibrium moves in the direction where there are more molecules of gas in
attempt to increase pressure.4. You can use a balanced equation to see
which side has more molecules of gas.
◍ test for carbon dioxide.
Answer: limewater turns milky
◍ saturated hydrocarbon.
Answer: A hydrocarbon that contains as many hydrogens as possible in each
molecule.
◍ Measuring rate of reaction - Change in mass.
Answer: - Put reaction on a measuring scale- If a gas is produced, the mass
will decrease- The quicker the mass decreases, the faster the reaction
◍ Paint is a formulation. What four components is it composed from?.
Answer: Pigment, solvent, binder and additives
◍ What is pH?.
Answer: A measure of the concentration of positive hydrogen ions in the
solution
◍ Examples of strong acids.
Answer: Sulfuric acidHydrochloric acidNitric acid
, ◍ Why might the number of spots formed on the chromatography paper
change in different solvents?.
Answer: The distribution of some chemicals may be the some in some
solvents but different in others
◍ Position of Equilibrium.
Answer: - Equilibrium doesn't mean amounts of reactants and products are
equal- If Equilibrium lies to right = higher conc. of products- If Equilibrium
lies to left = higher conc. of reactantsPosition of equilibrium depends on -
Temperature - Pressure - Concentration
◍ Properties of alkenes.
Answer: - Unsaturated- c=c bond can open to bond to other atoms- much
more reactive than alkanes
◍ What is the product of the reaction of a Group 1 metal with oxygen?.
Answer: A metal oxide, depending on the Group 1 metal-Lithium + oxygen
--> lithium oxide-Sodium + oxygen --> sodium oxide + sodium
peroxide-Potassium + oxygen --> potassium peroxide + potassium
superoxide
◍ Collision theory in rate of reaction.
Answer: 1. Collision frequency of reacting particles is how often they
collide -- more collisions = faster rate2. Energy transferred during a
collisionparticles need to collide with enough energy to be successful
◍ What is a negative ion?.
Answer: Anion
◍ What is an electrolyte?.
Answer: A liquid that contains ions which react with electrodes
◍ Will molecules that have a higher solubility and are less attracted to the
paper carry further or shorter up the paper?.
Answer: Further
◍ deforestation.
8464/C/1F CHEMISTRY PAPER 1F PAPER
& MARK SCHEME PRACTICE
EXAMINATION 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ unsaturated hydrocarbon.
Answer: A hydrocarbon containing a C=C double bond (and not as many
hydrogens as possible).
◍ Rate of reaction graphs.
Answer: - Graph 1, 2 and 3 converge at same levell = produce same amount
of product.- Graph 4 = more product and faster action (this can only happen
if more reactants are added to the start.
◍ Freezing.
Answer: When a liquid cools, the particles have less energy, so move around
lessThere's not enough energy to overcome the attraction between the
particles, so more bonds form between themAt the melting point, so many
bonds have formed between the particles that they're held in place - the
liquid becomes a solid
◍ What is the test for hydrogen?.
Answer: Holding a lit splint of the open end of a test tube containing a gas
◍ What is the relative mass of an electron?.
Answer: Very small
◍ Measuring rate of reaction - Volume of gas given off.
Answer: - A gas syringe is used to measure vol of gas being produced- The
, more gas given off in a given time interval = faster rate
◍ mobile phase.
Answer: substances travel in this phase (usually a solvent)
◍ What is a pure substance?.
Answer: A substance where nothing has been added to it, so it's in its natural
state (contains only one compound or element throughout)
◍ The shorter the hydrocarbon chain....
Answer: - The less viscous (more runny, less gloopy)- The more volatile
(low boiling points = more easily evaporated)- The more flammable
◍ Equation for Number of Moles.
Answer: Number of moles (mol) = Mass (g) of an element/compound / Mr
of the element/compound
◍ What happens in an electrochemical cell?.
Answer: The chemical reactions between the electrodes & the electrolyte set
up a charge difference between the electrodesIf the electrodes are connected
by a wire, the charge is able to flow & electricity is producedA voltmeter
can be connected to the circuit to measure the voltage of the cell
◍ Complete combustion.
Answer: - During combustion both the hydrogen and the carbon are
oxidised.- Hydrocarbons are used as fuels due to the amount of energy
releases after the completion of combustion
◍ What do alkalis form in water?.
Answer: Negative hydroxide ions
◍ State Symbols.
Answer: solid - sliquid - lgas - gaqueous - aq
◍ What's the difference between a burette and a pipette?.
Answer: 1) A burette measures varying volumes2) A pipette measures fixed
volumes
◍ Magnesium and HCl react to produce H2 gas.
, Answer: 1. Add a set volume of dilute HCL to a conical flask and place on
mass balance.2. Add a magnesium ribbon to acid and quickly plug the flask
with cotton wool.3. Start stopwatch and record mass of balance at regular
intervals.4. Plot results in a table and work out mass lost for each reading ->
plot results on a graph.5. Repeat with more concentrated acid solutions.
(Keep control variables like volume of acid and amount of magnesium
ribbon same each time)
◍ Le Chatelier's Principle - Changes to Pressure.
Answer: 1. Changing pressure only effects equilibrium involving gases. 2.
Increase pressure = equilibrium moves in the direction where there are fewer
molecules of gas in attempt to reduce pressure.3. Decrease pressure =
equilibrium moves in the direction where there are more molecules of gas in
attempt to increase pressure.4. You can use a balanced equation to see
which side has more molecules of gas.
◍ test for carbon dioxide.
Answer: limewater turns milky
◍ saturated hydrocarbon.
Answer: A hydrocarbon that contains as many hydrogens as possible in each
molecule.
◍ Measuring rate of reaction - Change in mass.
Answer: - Put reaction on a measuring scale- If a gas is produced, the mass
will decrease- The quicker the mass decreases, the faster the reaction
◍ Paint is a formulation. What four components is it composed from?.
Answer: Pigment, solvent, binder and additives
◍ What is pH?.
Answer: A measure of the concentration of positive hydrogen ions in the
solution
◍ Examples of strong acids.
Answer: Sulfuric acidHydrochloric acidNitric acid
, ◍ Why might the number of spots formed on the chromatography paper
change in different solvents?.
Answer: The distribution of some chemicals may be the some in some
solvents but different in others
◍ Position of Equilibrium.
Answer: - Equilibrium doesn't mean amounts of reactants and products are
equal- If Equilibrium lies to right = higher conc. of products- If Equilibrium
lies to left = higher conc. of reactantsPosition of equilibrium depends on -
Temperature - Pressure - Concentration
◍ Properties of alkenes.
Answer: - Unsaturated- c=c bond can open to bond to other atoms- much
more reactive than alkanes
◍ What is the product of the reaction of a Group 1 metal with oxygen?.
Answer: A metal oxide, depending on the Group 1 metal-Lithium + oxygen
--> lithium oxide-Sodium + oxygen --> sodium oxide + sodium
peroxide-Potassium + oxygen --> potassium peroxide + potassium
superoxide
◍ Collision theory in rate of reaction.
Answer: 1. Collision frequency of reacting particles is how often they
collide -- more collisions = faster rate2. Energy transferred during a
collisionparticles need to collide with enough energy to be successful
◍ What is a negative ion?.
Answer: Anion
◍ What is an electrolyte?.
Answer: A liquid that contains ions which react with electrodes
◍ Will molecules that have a higher solubility and are less attracted to the
paper carry further or shorter up the paper?.
Answer: Further
◍ deforestation.
