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GCSE Chemistry · key term
The principle that atoms are not created or destroyed in a chemical reaction, so the total mass is conserved.
Used by AQA, Edexcel and OCR
Specification 4.3.1.3 · Paper 1
The principle that atoms are neither created nor destroyed in a chemical reaction, so the total mass of reactants equals the total mass of products.
Revise: Mass Changes in Gas ReactionsThe law of conservation of mass says that no atoms are made or destroyed during a chemical reaction. The atoms in the reactants are rearranged to form the products, so the total mass of all the reactants equals the total mass of all the products.
Specification 1.44 · Paper 1, Paper 2
The principle that the total mass remains constant during a chemical reaction if no substances enter or leave the system.
Revise: Empirical Formulae CalculationUse conservation of mass to find the mass gained from the other element.
The principle that matter is not created or destroyed in a chemical reaction, so total mass remains constant when every reactant and product is included.
Specification C3.1b, CM3.4i, CM4.1i · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The principle that mass is not created or destroyed in a chemical reaction because atoms are rearranged rather than created or destroyed.
Revise: Writing Balanced EquationsConsequently, the number of atoms of each element is the same before and after the reaction. This particle explanation underlies the conservation of mass: in a closed system, the total mass of the products equals the total mass of the reactants.
The principle that atoms are neither created nor destroyed in a chemical reaction, so the total mass is conserved.
The principle that atoms are rearranged rather than created or destroyed in an ordinary chemical reaction, so total mass is conserved in a closed system.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The principle that mass is not created or destroyed during a chemical reaction, so the total mass of the products equals the total mass of the reactants for the complete reaction system.
Revise: Writing balanced equationsConsequently, every atom present among the reactants must also be present among the products. This is the particle-level explanation of the conservation of mass: the total mass of the products equals the total mass of the reactants for the complete reaction system.
The principle that atoms are not created or destroyed in a chemical reaction; they are rearranged into products.
The principle that atoms are not created or destroyed in a chemical reaction, so the total mass of reactants equals the total mass of products.
The rule that atoms are not created or destroyed in a chemical reaction, so each element must have the same number of atoms on both sides of an equation.
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