Worksheet library · A Level
Chemistry A Level Sciences Worksheets, Questions and Revision
21 original Chemistry worksheet packs - 243 printable pages with full mark schemes. Atomic structure, bonding, chemical reactions, rates and the rest of the specification. View any pack in the browser or open the print-ready PDF.
See the method: Atomic Structure
Gallium exists as two isotopes, 69Ga (60.0% abundance) and 71Ga (40.0% abundance). Calculate the relative atomic mass of gallium, giving your answer to 1 decimal place.
- Convert each percentage abundance to a decimal: 60.0% = 0.600 and 40.0% = 0.400.
- Multiply each isotope's mass number by its decimal abundance: 69 x 0.600 = 41.4, and 71 x 0.400 = 28.4.
- Add the two products together: 41.4 + 28.4 = 69.8.
- Check the abundances sum to 100% (60.0 + 40.0 = 100), confirming no isotopes are missing.
- Final answer: relative atomic mass of gallium = 69.8
2.1 Atomic Structure6p + answers · 90 marks · PDF
2.1d Atomic Structure: Depth and Exam Drill5p + answers · 82 marks · PDF
2.2 Bonding and Structure6p + answers · 140 marks · PDF
2.2d Bonding and Structure: Depth and Exam Drill4p + answers · 94 marks · PDF
2.3 Energetics and Thermodynamics6p + answers · 103 marks · PDF
2.3d Energetics and Thermodynamics: Depth and Exam Drill4p + answers · 87 marks · PDF
2.4 Kinetics and Equilibria7p + answers · 126 marks · PDF
2.4d Kinetics and Equilibria: Depth and Exam Drill4p + answers · 88 marks · PDF
2.5 Redox and Electrochemistry5p + answers · 93 marks · PDF
2.5d Redox and Electrochemistry: Depth and Exam Drill4p + answers · 78 marks · PDF
2.6 The Periodic Table and Inorganic Chemistry6p + answers · 115 marks · PDF
2.6d The Periodic Table and Inorganic Chemistry: Depth and Exam Drill4p + answers · 85 marks · PDF
2.7 Organic Chemistry6p + answers · 146 marks · PDF
2.7d Organic Chemistry: Depth and Exam Drill6p + answers · 100 marks · PDF
2.8 Analytical Techniques6p + answers · 118 marks · PDF
2.8d Analytical Techniques: Depth and Exam Drill5p + answers · 91 marks · PDF
2.10 Chemistry: Rate Equations and Equilibrium6p + answers · 113 marks · PDF
2.10d Chemistry: Rate Equations and Equilibrium: Depth and Exam Drill5p + answers · 95 marks · PDF
2.11 Chemistry: Aromatic Chemistry, Carbonyls and Amines6p + answers · 124 marks · PDF
2.12 Chemistry: Electrode Potentials and Transition Metals6p + answers · 129 marks · PDF
2.9 A-Level Chemistry: Required Practicals and Practical Skills11p + answers · 156 marks · PDF
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