Actual 2025 AQA GCSE CHEMISTRY 8462/1H
Paper 1 Higher Tier Merged Question Paper +
Mark S, Exams of Chemistry
nanoparticle
particles of 1-100 nanometers across - can modify properties of
materials
volume
The amount of space occupied by an object.
surface area
The total area of the surface of a three-dimensional object
mole
6.02x10²³ or Avogadro's number, it is a standard scientific unit for
measuring large quantities of very small entities such as atoms,
molecules, or other specified particles. It is the number of atoms
contained in 12 grams of carbon-12.
relative atomic mass
The weighted mean mass of an atom of an element compared with
one-twelfth of the mass of an atom of carbon-12
relative formula mass
The weighted mean mass of a formula unit compared with one-
twelfth of the mass of an atom of carbon-12
balanced equation
,A balanced chemical equation occurs when the number of the
different atoms of elements on the reactants side is equal to that of
the products side.
limiting reactant
The reactant that runs out first in the chemical reaction and limits
the amount of product created
yield
the mass of the product produced in a chemical reaction
percentage yield
(actual yield/theoretical yield) x 100
atom economy
(Molecular mass of the desired product / Sum of molecular masses
of all products) x 100
concentration
A measure of how much solute is dissolved in a specific amount of
solvent or solution. = Amount of solute (g)/Volume of solution (dm³)
titration
the process used to find the unknown molarity of an acid or a base
by adding measured volumes of an acid of known molarity to a
base of unknown molarity (or vice versa) until the equivalence point
or neutralization (pH 7) is reached
, burette
long, cylindrical, graduated tube of uniform bore fitted with a
stopcock and a small-bore exit
end point
The point in a titration that signals that equivalent quantities of
reactants have been added.
indicator
A substance that undergoes a color change to signal a change in
chemical conditions; acid-base indicators change color over
specified pH ranges.
neutralisation
The reaction between an acid and a base. Typically produces a salt
and water.
solute
the substance being dissolved into a solution, often in lesser
quantity
solution
Formed wh¹en substances (solute) dissolves in other substances
(solvent). Homogeneous mixture.
Paper 1 Higher Tier Merged Question Paper +
Mark S, Exams of Chemistry
nanoparticle
particles of 1-100 nanometers across - can modify properties of
materials
volume
The amount of space occupied by an object.
surface area
The total area of the surface of a three-dimensional object
mole
6.02x10²³ or Avogadro's number, it is a standard scientific unit for
measuring large quantities of very small entities such as atoms,
molecules, or other specified particles. It is the number of atoms
contained in 12 grams of carbon-12.
relative atomic mass
The weighted mean mass of an atom of an element compared with
one-twelfth of the mass of an atom of carbon-12
relative formula mass
The weighted mean mass of a formula unit compared with one-
twelfth of the mass of an atom of carbon-12
balanced equation
,A balanced chemical equation occurs when the number of the
different atoms of elements on the reactants side is equal to that of
the products side.
limiting reactant
The reactant that runs out first in the chemical reaction and limits
the amount of product created
yield
the mass of the product produced in a chemical reaction
percentage yield
(actual yield/theoretical yield) x 100
atom economy
(Molecular mass of the desired product / Sum of molecular masses
of all products) x 100
concentration
A measure of how much solute is dissolved in a specific amount of
solvent or solution. = Amount of solute (g)/Volume of solution (dm³)
titration
the process used to find the unknown molarity of an acid or a base
by adding measured volumes of an acid of known molarity to a
base of unknown molarity (or vice versa) until the equivalence point
or neutralization (pH 7) is reached
, burette
long, cylindrical, graduated tube of uniform bore fitted with a
stopcock and a small-bore exit
end point
The point in a titration that signals that equivalent quantities of
reactants have been added.
indicator
A substance that undergoes a color change to signal a change in
chemical conditions; acid-base indicators change color over
specified pH ranges.
neutralisation
The reaction between an acid and a base. Typically produces a salt
and water.
solute
the substance being dissolved into a solution, often in lesser
quantity
solution
Formed wh¹en substances (solute) dissolves in other substances
(solvent). Homogeneous mixture.
