Quantitative Chemistry Exam Questions
Questions on conservation of mass, relative formula mass, moles, percentage yield, atom economy, concentration calculations, and volumes of gases. Download free past paper questions organised by topic with mark schemes.
Frequently Asked Questions
How do you calculate relative formula mass (Mr)?
Add up the relative atomic masses (Ar) of all atoms in the formula. Example: H₂O = (2 × 1) + 16 = 18. Use the periodic table to find Ar values.
How do you calculate moles GCSE Chemistry?
Moles = Mass (g) ÷ Relative formula mass (Mr). Also: Moles = Volume (dm³) × Concentration (mol/dm³). And: Moles of gas = Volume (dm³) ÷ 24
What is percentage yield GCSE?
Percentage yield = (actual yield ÷ theoretical yield) × 100. It is always less than 100% due to: incomplete reactions, side reactions, and loss during purification.
What is atom economy GCSE Chemistry?
Atom economy = (Mr of desired product ÷ sum of Mr of all reactants) × 100. High atom economy means less waste. This is a Triple Science topic.
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