English National Curriculum - Science
Mission Objectives
Describe how to balance chemical equations to show the correct ratios of reactants and products
Explain how the concept of moles links mass, molar mass, and the number of particles in a chemical reaction
Calculate the mass of a reactant or product using a balanced equation, molar mass, and the mole equation (moles = mass ÷ Mr)
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Words and meanings to learn
mole
the amount of substance that contains 6.02 × 10²³ particles, such as atoms, molecules or ions
molar ratio
the ratio of the number of moles of each substance in a balanced chemical equation
relative molar mass (Mr)
the sum of the relative atomic masses of all the atoms in a chemical formula
balanced equation
a chemical equation in which the number of atoms of each element is the same on both sides of the reaction
grid method
the organisational tool for working out moles, masses and ratios
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