Study resource
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations key terms
Study Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations with curriculum-aligned Key Terms resources, practice links, and exam-focused support.
At a glance
key terms
Resource type
Topic
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations
Key terms
Conservation of mass
The principle stating that no atoms are lost or created during a chemical reaction.
Chemical reaction
A process in which substances (reactants) are transformed into different substances (products) without any loss of mass.
reactant
A substance that undergoes a chemical change in a reaction. In Conservation of mass and balanced chemical equations, this term helps explain explain that the mass of the products equals the mass of the reactants in a chemical reaction for AQA GCSE Chemistry 8462 Unit 4.3.
product
A substance that is formed as a result of a chemical reaction. In Conservation of mass and balanced chemical equations, this term helps explain explain that the mass of the products equals the mass of the reactants in a chemical reaction for AQA GCSE Chemistry 8462 Unit 4.3.
balanced symbol equation
A representation of a chemical reaction where the number of atoms for each element is the same on both sides of the equation.
reactants
Substances that undergo a chemical change in a reaction, found on the left side of a balanced symbol equation.
symbol equation
A representation of a chemical reaction using symbols and formulae to show the reactants and products.
balancing
The process of ensuring that the number of atoms of each element is the same on both sides of a chemical equation.
multiplier
A number placed before a chemical formula in an equation indicating how many molecules or moles of that substance are involved in the reaction.
balanced chemical equation
An equation that shows the same number of each type of atom on both sides, representing the conservation of mass during a chemical reaction.
subscript
A small number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.
balanced chemical equation
An equation that shows the reactants and products of a chemical reaction with equal numbers of each type of atom on both sides.
multiplier
A number placed before a chemical formula in a balanced equation indicating the number of units of that substance.
subscript
A number written below and to the right of a chemical symbol in a formula indicating the number of atoms of that element in a molecule.
conservation of mass
The principle stating that no atoms are lost or made during a chemical reaction, meaning the mass of reactants equals the mass of products.
balanced chemical equation
A representation of a chemical reaction where the number of atoms for each element is the same on both sides of the equation, supporting the conservation of mass.
relative formula mass
The sum of the relative atomic masses of atoms in the numbers shown in a chemical formula.
Mr
The symbol used to represent relative formula mass in chemistry. In Relative formula mass, this term helps explain define relative formula mass, Mr, as the sum of the relative atomic masses of atoms in the numbers shown in a formula for AQA GCSE Chemistry 8462 Unit 4.3.
Relative Formula Mass
The sum of the relative atomic masses of all atoms in a chemical formula. In Relative formula mass, this term helps explain calculate the relative formula mass of a compound from its chemical formula and relative atomic masses for AQA GCSE Chemistry 8462 Unit 4.3.
Chemical Formula
A representation of a substance using symbols for its constituent elements and numbers to indicate the ratio of atoms.
relative formula mass
The sum of the relative atomic masses of atoms in the numbers shown in a chemical formula.
subscript
A number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.
relative formula mass
The sum of the relative atomic masses of atoms in the numbers shown in a chemical formula.
reactants
The starting substances in a chemical reaction that undergo change to form products. In Relative formula mass, this term helps explain explain that in a balanced chemical equation the total relative formula mass of reactants in the stated quantities equals that of the products for AQA GCSE Chemistry 8462 Unit 4.3.
relative formula mass
The sum of the relative atomic masses of atoms in the numbers shown in a chemical formula.
percentage by mass
The mass contribution of an element in a compound expressed as a percentage of the total relative formula mass.
relative formula mass
The sum of the relative atomic masses of all atoms in a chemical formula. In Relative formula mass, this term helps explain use formulae and Ar values accurately when completing percentage-by-mass calculations for AQA GCSE Chemistry 8462 Unit 4.3.
percentage by mass
The mass contribution of an element in a compound expressed as a percentage of the total mass of the compound.
relative formula mass
The sum of the relative atomic masses of atoms in the numbers shown in a chemical formula.
relative atomic mass
The mass of an atom of an element compared to one-twelfth of the mass of a carbon-12 atom.
Related topics