Chemistry Paper 1 | Calculations
Chemistry Paper 1
Exam-Style Calculations [Grade 7-9]
★ Includes 2-3 exam-style questions for each topic.
★ Answers with step-by-step working out at the end.
★ Equations to memorise
★ This will help prepare you for your Chemistry Paper 1.
★ Aiming for Grade 7-9.
★ If you are struggling to answer these questions, watch Freesciencelessons on his
playlist “9-1 GCSE Chemistry Paper 1 Quantitative Chemistry”.
Topics covered include:-
❏ Calculating Moles of an Element
❏ Calculating Moles of a Compound
❏ Calculating Mass of a Number of Moles
❏ Using Moles to Balance Equations
❏ Avogadro’s Constant 1
❏ Avogadro’s Constant 2
❏ Reacting Masses 1
❏ Reacting Masses 2
❏ Limiting Reactant
❏ Concentration of Solutions
❏ Calculating Percentage Yield [Triple]
❏ Atom Economy [Triple]
❏ Using Concentration of Solutions 1 [Triple]
❏ Using Concentration of Solutions 2 [Triple]
❏ Using Gas Volumes 1 [Triple]
❏ Using Gas Volumes 2 [Triple]
❏ Titration Calculations 1 [Triple]
❏ Titration Calculations 2 [Triple]
❏ Bond Energy Calculations
Made by Saleha Begum
If you have any questions, contact me on my email: s
, Chemistry Paper 1 | Calculations
Chemistry Paper 1 | Equations to Memorise
moles = mass (g) / Mr
Avogadro’s constant = 6.02 x 1023
concentration (g/dm3) = mass (g) / volume (dm3)
concentration (mol/dm3) = number of moles / volume (dm3)
percentage yield (%) = [mass of product actually made / maximum theoretical mass of product] x 100
atom economy (%) = [Mr of desired products / sum of Mr of all reactants] x 100
volume (dm3) = number of moles x 24
energy change (kJ/mol) = breaking bonds energy - making bonds energy
, Chemistry Paper 1 | Calculations
1. Calculating Moles of an Element
1.1. You are given a sample of sulfur with a mass of 4064 grams.
Calculate the number of moles of sulfur in the sample. Ar for sulfur = 32.
____________________ [2 marks]
1.2. A sample of rock contains 252 grams of iron.
Calculate the number of moles of iron in the sample. Ar for iron = 56.
____________________ [2 marks]
Chemistry Paper 1
Exam-Style Calculations [Grade 7-9]
★ Includes 2-3 exam-style questions for each topic.
★ Answers with step-by-step working out at the end.
★ Equations to memorise
★ This will help prepare you for your Chemistry Paper 1.
★ Aiming for Grade 7-9.
★ If you are struggling to answer these questions, watch Freesciencelessons on his
playlist “9-1 GCSE Chemistry Paper 1 Quantitative Chemistry”.
Topics covered include:-
❏ Calculating Moles of an Element
❏ Calculating Moles of a Compound
❏ Calculating Mass of a Number of Moles
❏ Using Moles to Balance Equations
❏ Avogadro’s Constant 1
❏ Avogadro’s Constant 2
❏ Reacting Masses 1
❏ Reacting Masses 2
❏ Limiting Reactant
❏ Concentration of Solutions
❏ Calculating Percentage Yield [Triple]
❏ Atom Economy [Triple]
❏ Using Concentration of Solutions 1 [Triple]
❏ Using Concentration of Solutions 2 [Triple]
❏ Using Gas Volumes 1 [Triple]
❏ Using Gas Volumes 2 [Triple]
❏ Titration Calculations 1 [Triple]
❏ Titration Calculations 2 [Triple]
❏ Bond Energy Calculations
Made by Saleha Begum
If you have any questions, contact me on my email: s
, Chemistry Paper 1 | Calculations
Chemistry Paper 1 | Equations to Memorise
moles = mass (g) / Mr
Avogadro’s constant = 6.02 x 1023
concentration (g/dm3) = mass (g) / volume (dm3)
concentration (mol/dm3) = number of moles / volume (dm3)
percentage yield (%) = [mass of product actually made / maximum theoretical mass of product] x 100
atom economy (%) = [Mr of desired products / sum of Mr of all reactants] x 100
volume (dm3) = number of moles x 24
energy change (kJ/mol) = breaking bonds energy - making bonds energy
, Chemistry Paper 1 | Calculations
1. Calculating Moles of an Element
1.1. You are given a sample of sulfur with a mass of 4064 grams.
Calculate the number of moles of sulfur in the sample. Ar for sulfur = 32.
____________________ [2 marks]
1.2. A sample of rock contains 252 grams of iron.
Calculate the number of moles of iron in the sample. Ar for iron = 56.
____________________ [2 marks]
