GCSE CHEMISTRY QUANTITATIVE CHEMISTRY EXAM REVISION
QUESTIONS WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.
Avogadro's constant - ANSWER- the number of atoms, molecules, or ions in a mole of any
substance (i.e., 6.02 × 10-23 per mol)
Concentration - ANSWER- the amount of a substance dissolved in a given volume of liquid
Limiting reactant - ANSWER- the reactant in a chemical reaction that when used up causes the
reaction to stop
Mole - ANSWER- the amount of substance in the relative atomic or formula mass of a
substance in grams
Relative atomic mass Ar - ANSWER- the average mass of the atoms of an element compared
with carbon-12 (which is given a mass of exactly 12). The average mass must take into account
the proportions of the naturally occurring isotopes of the element
Relative formula mass Mr - ANSWER- the total of the relative atomic masses, added up in the
ratio shown in the chemical formula, of a substance
Balanced symbol equation - ANSWER- a symbol equation in which there are equal numbers
of each type of atom on either side of the equation
Law of conservation of mass - ANSWER- the total mass of the products formed in a reaction
is equal to the total mass of the reactants
Mass number - ANSWER- the number of protons plus neutrons in the nucleus of an atom
QUESTIONS WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.
Avogadro's constant - ANSWER- the number of atoms, molecules, or ions in a mole of any
substance (i.e., 6.02 × 10-23 per mol)
Concentration - ANSWER- the amount of a substance dissolved in a given volume of liquid
Limiting reactant - ANSWER- the reactant in a chemical reaction that when used up causes the
reaction to stop
Mole - ANSWER- the amount of substance in the relative atomic or formula mass of a
substance in grams
Relative atomic mass Ar - ANSWER- the average mass of the atoms of an element compared
with carbon-12 (which is given a mass of exactly 12). The average mass must take into account
the proportions of the naturally occurring isotopes of the element
Relative formula mass Mr - ANSWER- the total of the relative atomic masses, added up in the
ratio shown in the chemical formula, of a substance
Balanced symbol equation - ANSWER- a symbol equation in which there are equal numbers
of each type of atom on either side of the equation
Law of conservation of mass - ANSWER- the total mass of the products formed in a reaction
is equal to the total mass of the reactants
Mass number - ANSWER- the number of protons plus neutrons in the nucleus of an atom
