AQA GCSE COMBINED SCIENCE: TRILOGY
8464/C/2H HIGHER TIER CHEMISTRY
PAPER 2H PAPER & MARK SCHEME
PRACTICE EXAMINATION 2026
QUESTIONS WITH ANSWERS GRADED A+
◍ What are titrations used for?.
Answer: Finding out exactly how much acid is needed to neutralise a
quantity of alkali - or vice versa
◍ Describe the structure of a metal.
Answer: Metals consist of a giant structure of atoms arranged in regular
layers, the electrons in the outer energy level of each atom are delocalised
◍ Where are elements shown?.
Answer: Elements are shown in the Periodic table
◍ What is silicon dioxide?.
Answer: Sand. Each grain of sand is one giant structure of silicon and
oxygen.
◍ When a group 7 element reacts with a metal what charges does the group 7
element have?.
Answer: When a group 7 element reacts with a metal the group 7 element
gains and electron and forms a 1- ion
◍ What is the charge of an electron?.
Answer: -1
◍ How many centimeters is one decimetre?.
Answer: 1000 cm = 1 dm
,◍ How is a chemical formula presented?.
Answer: Each element symbol starts with a capital letter, if there is a second
letter it is in lower case
◍ What are coarse particles?.
Answer: Particles that have a diameter between 2,500 nm and 10,000 nm -
also known as dust
◍ What are electrolytes?.
Answer: Electrolytes are liquids or solutions that can conduct electricity
they are the solution being broken down
◍ Anode.
Answer: Positive electrodeNegative ions move towards itElectrons are
lostOxidation happens
◍ List the main properties of ionic compounds.
Answer: 1) High melting and boiling points - many strong bonds between
the ions2) They can't conduct electricity when they're solid - the ions are
held in a fixed arrangement therefore they can't pass on the electrical
current.3) They can conduct electricity when they're liquids because the ions
are free to move therefore they can pass on the electrical current.4) They
dissolve easily in water - they are free to move in the solution and can carry
electrical current.
◍ Uses of Fullerenes.
Answer: 1) To 'cage' other molecules - the fullerene structure forms around
another atom/molecule, which is then trapped inside - used to deliver drugs
into the body2) Make good industrial catalysts due to their large surface
area3) Make good lubricants
◍ Can a molten ionic compound be electrolysed?.
Answer: Yes, because the ions can move freely and conduct electricity
◍ What is needed for a displacement reaction?.
Answer: The element being displaced need to be less reactive than the
, element that is displacing it
◍ Why are energy changes shown as positive in endothermic reactions?.
Answer: In an endothermic reaction energy changes are shown as positive
because energy has been gained
◍ Where are transition metals located?.
Answer: Transition metals are located in the centre of the periodic table
◍ Do nanoparticles have a high or low surface area to volume ratio?.
Answer: Very high surface area to volume ratio - the surface area is very
large compared to the volume, therefore, they make good catalysts
◍ What colour is iodine?.
Answer: A dark grey crystalline solid or a purple vapour
◍ What is the Relative Atomic Mass (Ar)?.
Answer: Relative Atomic Mass is the final mass that takes in consideration
all the isotopes of an element
◍ What ions do Group 1, 2, 3, 5, 6 and 7 elements form?.
Answer: Group 1/ 1+Group 2/ 2+Group 3/ 3+Group 5/ 3-Group 6/ 2-Group
7/ 1-
◍ What is a positive ion?.
Answer: Cation
◍ Do metals have a low or high melting and boiling point?.
Answer: Metals have a high melting and boiling point
◍ What is formed when hydrochloric acid reacts with magnesium?.
Answer: Hydrochloric Acid + Magnesium → Magnesium Chloride +
Hydrogen
◍ What is the energy value?.
Answer: The energy value tells us the energy required to break that bond
◍ What is the charge of a proton?.
Answer: +1
, ◍ What are non-rechargeable batteries?.
Answer: Batteries which contain cells which use irreversible reactions -
once one of the reactants is used up, they don't produce any more charge,
therefore you have to replace themE.g. alkaline batteries
◍ What causes the charge difference (voltage) in an electrochemical cell?.
Answer: Different metals react differently with the same electrolyte
◍ Why does silicon dioxide have a high melting and boiling point?.
Answer: Silicon dioxide has a high melting and boiling point because it is
made up of strong covalent bonds and a lot of heat energy is required to
break its bonds
◍ What are delocalised electrons?.
Answer: Delocalised electrons are electrons that can move meaning they can
conduct heat and electricity
◍ Where are unreactive metals such as gold found?.
Answer: Unreactive metals such as gold are found in the Earth
◍ What were the early ideas of the structure of atoms?.
Answer: Early ideas of the structure of atoms stated that they are tiny
spheres that cannot be divided
◍ What is formed when an acid reacts with an alkali?.
Answer: Acid + Alkali → Salt + Water
◍ Why is graphite soft and slippery?.
Answer: Graphite is soft and slippery because graphite is made up of
hexagonal rings in on top of each other and there are no covalent bonds
between the layers so the layers can slide making graphite soft and slippery
◍ How is a battery formed?.
Answer: By connecting two or more cells together in series - the voltages
are combined so there is a bigger voltage overall for the battery
◍ What is oxidation?.
Answer: Oxidation is loss of electrons
8464/C/2H HIGHER TIER CHEMISTRY
PAPER 2H PAPER & MARK SCHEME
PRACTICE EXAMINATION 2026
QUESTIONS WITH ANSWERS GRADED A+
◍ What are titrations used for?.
Answer: Finding out exactly how much acid is needed to neutralise a
quantity of alkali - or vice versa
◍ Describe the structure of a metal.
Answer: Metals consist of a giant structure of atoms arranged in regular
layers, the electrons in the outer energy level of each atom are delocalised
◍ Where are elements shown?.
Answer: Elements are shown in the Periodic table
◍ What is silicon dioxide?.
Answer: Sand. Each grain of sand is one giant structure of silicon and
oxygen.
◍ When a group 7 element reacts with a metal what charges does the group 7
element have?.
Answer: When a group 7 element reacts with a metal the group 7 element
gains and electron and forms a 1- ion
◍ What is the charge of an electron?.
Answer: -1
◍ How many centimeters is one decimetre?.
Answer: 1000 cm = 1 dm
,◍ How is a chemical formula presented?.
Answer: Each element symbol starts with a capital letter, if there is a second
letter it is in lower case
◍ What are coarse particles?.
Answer: Particles that have a diameter between 2,500 nm and 10,000 nm -
also known as dust
◍ What are electrolytes?.
Answer: Electrolytes are liquids or solutions that can conduct electricity
they are the solution being broken down
◍ Anode.
Answer: Positive electrodeNegative ions move towards itElectrons are
lostOxidation happens
◍ List the main properties of ionic compounds.
Answer: 1) High melting and boiling points - many strong bonds between
the ions2) They can't conduct electricity when they're solid - the ions are
held in a fixed arrangement therefore they can't pass on the electrical
current.3) They can conduct electricity when they're liquids because the ions
are free to move therefore they can pass on the electrical current.4) They
dissolve easily in water - they are free to move in the solution and can carry
electrical current.
◍ Uses of Fullerenes.
Answer: 1) To 'cage' other molecules - the fullerene structure forms around
another atom/molecule, which is then trapped inside - used to deliver drugs
into the body2) Make good industrial catalysts due to their large surface
area3) Make good lubricants
◍ Can a molten ionic compound be electrolysed?.
Answer: Yes, because the ions can move freely and conduct electricity
◍ What is needed for a displacement reaction?.
Answer: The element being displaced need to be less reactive than the
, element that is displacing it
◍ Why are energy changes shown as positive in endothermic reactions?.
Answer: In an endothermic reaction energy changes are shown as positive
because energy has been gained
◍ Where are transition metals located?.
Answer: Transition metals are located in the centre of the periodic table
◍ Do nanoparticles have a high or low surface area to volume ratio?.
Answer: Very high surface area to volume ratio - the surface area is very
large compared to the volume, therefore, they make good catalysts
◍ What colour is iodine?.
Answer: A dark grey crystalline solid or a purple vapour
◍ What is the Relative Atomic Mass (Ar)?.
Answer: Relative Atomic Mass is the final mass that takes in consideration
all the isotopes of an element
◍ What ions do Group 1, 2, 3, 5, 6 and 7 elements form?.
Answer: Group 1/ 1+Group 2/ 2+Group 3/ 3+Group 5/ 3-Group 6/ 2-Group
7/ 1-
◍ What is a positive ion?.
Answer: Cation
◍ Do metals have a low or high melting and boiling point?.
Answer: Metals have a high melting and boiling point
◍ What is formed when hydrochloric acid reacts with magnesium?.
Answer: Hydrochloric Acid + Magnesium → Magnesium Chloride +
Hydrogen
◍ What is the energy value?.
Answer: The energy value tells us the energy required to break that bond
◍ What is the charge of a proton?.
Answer: +1
, ◍ What are non-rechargeable batteries?.
Answer: Batteries which contain cells which use irreversible reactions -
once one of the reactants is used up, they don't produce any more charge,
therefore you have to replace themE.g. alkaline batteries
◍ What causes the charge difference (voltage) in an electrochemical cell?.
Answer: Different metals react differently with the same electrolyte
◍ Why does silicon dioxide have a high melting and boiling point?.
Answer: Silicon dioxide has a high melting and boiling point because it is
made up of strong covalent bonds and a lot of heat energy is required to
break its bonds
◍ What are delocalised electrons?.
Answer: Delocalised electrons are electrons that can move meaning they can
conduct heat and electricity
◍ Where are unreactive metals such as gold found?.
Answer: Unreactive metals such as gold are found in the Earth
◍ What were the early ideas of the structure of atoms?.
Answer: Early ideas of the structure of atoms stated that they are tiny
spheres that cannot be divided
◍ What is formed when an acid reacts with an alkali?.
Answer: Acid + Alkali → Salt + Water
◍ Why is graphite soft and slippery?.
Answer: Graphite is soft and slippery because graphite is made up of
hexagonal rings in on top of each other and there are no covalent bonds
between the layers so the layers can slide making graphite soft and slippery
◍ How is a battery formed?.
Answer: By connecting two or more cells together in series - the voltages
are combined so there is a bigger voltage overall for the battery
◍ What is oxidation?.
Answer: Oxidation is loss of electrons
