AQA GCSE COMBINED SCIENCE: TRILOGY
8464/C/1H HIGHER TIER CHEMISTRY
PAPER 1H PAPER & MARK SCHEME
COMPREHENSIVE STUDY GUIDE 2026 FULL
QUESTIONS AND SOLUTIONS GRADED A+
◍ What forms Whilst the particles are constantly moving between the mobile
and stationary phases in chromatography?.
Answer: An equilibrium
◍ Le Chatelier's Principle - Changes to Temperature.
Answer: 1. If you decrease the temperature = the equilibrium will move in
the exothermic direction to produce more heat = more products for the
exothermic reaction than the endothermic reaction.2. If you increase the
temperature = the equilibrium will move in the endothermic direction to try
& decrease it = more products for the endothermic reaction than the
exothermic reaction.
◍ test for oxygen.
Answer: relights a glowing splint
◍ fraction.
Answer: Made up of hydrocarbons with similar boiling points separated
from crude oil.
◍ Will molecules that have a higher solubility and are less attracted to the
paper carry further or shorter up the paper?.
Answer: Further
◍ Why do you have to use nitric acid in the halide ions test and not
, hydrochloride acid?.
Answer: Hydrochloride acid would introduce chloride ions to the solution,
so a white precipitate would be formed regardless of whether the solution
originally contained chloride ions or not
◍ creating waste - landfills.
Answer: waste contributes to CO2 build up
◍ What happens when a carbonate reacts with a dilute acid?.
Answer: Produces salt, water and carbon dioxide
◍ Rf =.
Answer: distance moved by substance ÷ distance moved by solvent
◍ test for carbon dioxide.
Answer: limewater turns milky
◍ What colour precipitate does the negative ion chloride produce when used in
the halide test?.
Answer: White
◍ 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
◍ Examples of chemical reactions.
Answer: 1. Slowest speed - Rusting of Iron2. Slow - Chemical weathering
like Acid rain damage 3. Moderate speed - Metal Magnesium reacting with
acid to produce steam of bubbles4. Fast speed - Burning 5. Fastest -
Explosions
◍ baseline.
Answer: the starting point where substances are placed in chromatography
◍ What are the two phases of chromatography?.
Answer: 1) Mobile phase: where the molecules can move (liquid or gas)2)
8464/C/1H HIGHER TIER CHEMISTRY
PAPER 1H PAPER & MARK SCHEME
COMPREHENSIVE STUDY GUIDE 2026 FULL
QUESTIONS AND SOLUTIONS GRADED A+
◍ What forms Whilst the particles are constantly moving between the mobile
and stationary phases in chromatography?.
Answer: An equilibrium
◍ Le Chatelier's Principle - Changes to Temperature.
Answer: 1. If you decrease the temperature = the equilibrium will move in
the exothermic direction to produce more heat = more products for the
exothermic reaction than the endothermic reaction.2. If you increase the
temperature = the equilibrium will move in the endothermic direction to try
& decrease it = more products for the endothermic reaction than the
exothermic reaction.
◍ test for oxygen.
Answer: relights a glowing splint
◍ fraction.
Answer: Made up of hydrocarbons with similar boiling points separated
from crude oil.
◍ Will molecules that have a higher solubility and are less attracted to the
paper carry further or shorter up the paper?.
Answer: Further
◍ Why do you have to use nitric acid in the halide ions test and not
, hydrochloride acid?.
Answer: Hydrochloride acid would introduce chloride ions to the solution,
so a white precipitate would be formed regardless of whether the solution
originally contained chloride ions or not
◍ creating waste - landfills.
Answer: waste contributes to CO2 build up
◍ What happens when a carbonate reacts with a dilute acid?.
Answer: Produces salt, water and carbon dioxide
◍ Rf =.
Answer: distance moved by substance ÷ distance moved by solvent
◍ test for carbon dioxide.
Answer: limewater turns milky
◍ What colour precipitate does the negative ion chloride produce when used in
the halide test?.
Answer: White
◍ 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
◍ Examples of chemical reactions.
Answer: 1. Slowest speed - Rusting of Iron2. Slow - Chemical weathering
like Acid rain damage 3. Moderate speed - Metal Magnesium reacting with
acid to produce steam of bubbles4. Fast speed - Burning 5. Fastest -
Explosions
◍ baseline.
Answer: the starting point where substances are placed in chromatography
◍ What are the two phases of chromatography?.
Answer: 1) Mobile phase: where the molecules can move (liquid or gas)2)
