Question 1 of 3 · No calculator needed
An atom has atomic number 17 and mass number 37. How many neutrons does it contain?
The atomic number gives 17 protons. Neutrons = mass number − atomic number = 37 − 17 = 20.
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Question 2 of 3 · No calculator needed
Which sequence obtains dry crystals of a dissolved salt from its solution?
Partial evaporation makes a concentrated solution; cooling forms crystals, which are then filtered and dried. Strong heating to dryness may decompose some salts.
Question 3 of 3 · No calculator needed
How should pure dry copper(II) sulfate crystals be prepared from copper(II) oxide and dilute sulfuric acid?
Excess insoluble oxide uses up the acid; filtration removes unreacted oxide. Partial evaporation and cooling crystallise the salt without decomposing it.
These tiles show your answers to three questions. They are a starting point, not a mastery score or grade prediction.
Key concepts in chemistry
Correct answer: 20
The atomic number gives 17 protons. Neutrons = mass number − atomic number = 37 − 17 = 20.
States of matter and mixtures
Correct answer: Evaporate some water, cool to crystallise, filter and dry
Partial evaporation makes a concentrated solution; cooling forms crystals, which are then filtered and dried. Strong heating to dryness may decompose some salts.
Chemical changes
Correct answer: Add excess warm copper(II) oxide, filter, concentrate, cool, filter and dry crystals
Excess insoluble oxide uses up the acid; filtration removes unreacted oxide. Partial evaporation and cooling crystallise the salt without decomposing it.
For parents: look at the explanation together. A correct answer is encouraging; a missed answer gives you something specific to work on. Broader practice over time is needed to understand progress.
YOUR TOPIC MAP
9 areasFind your starting point.
01Key concepts in chemistry
Specification reference: C1
Most alpha particles passed through, showing atoms are mostly empty space, but rare large deflections required a tiny, dense, positively charged nucleus. Later work identified protons and neutrons in the nucleus.
Watch for: Do not describe Key concepts in chemistry only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
02States of matter and mixtures
Specification reference: C2
Two spots show the sample contains at least two soluble components. A matching Rf under the same conditions supports the presence of the reference dye, though additional evidence can strengthen identification.
Watch for: Do not describe States of matter and mixtures only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
03Chemical changes
Specification reference: C3
Drying and weighing the cathode before and after gives the mass of copper deposited. Current, time, electrode area and concentration should be controlled or measured for a valid comparison.
Watch for: Do not describe Chemical changes only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
04Extracting metals and equilibria
Specification reference: C4
Lower temperature favours exothermic ammonia formation but is slow. Higher pressure favours ammonia but requires costly strong equipment. Industrial conditions and an iron catalyst balance rate, yield, safety and cost.
Watch for: Do not describe Extracting metals and equilibria only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
05Separate chemistry 1
Specification reference: C5
Both use redox reactions to transfer chemical energy electrically. A chemical cell stops when a reactant is exhausted; a fuel cell operates while reactants are continuously supplied and produces water in the hydrogen–oxygen case.
Watch for: Do not describe Separate chemistry 1 only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
06Groups in the periodic table
Specification reference: C6
Chlorine dissolves in moisture, making the litmus acidic before bleaching the dye. The other observations test oxygen, carbon dioxide and hydrogen respectively.
Watch for: Do not describe Groups in the periodic table only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
07Rates of reaction and energy changes
Specification reference: C7
Exothermic products have lower energy than reactants. Activation energy is the minimum energy barrier from the reactant level to the profile peak; a catalyst lowers this barrier without changing the overall energy change.
Watch for: Do not describe Rates of reaction and energy changes only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
08Fuels and Earth science
Specification reference: C8
Volcanic outgassing supplied water vapour, carbon dioxide and nitrogen. Cooling condensed water to oceans; carbon dioxide decreased through dissolution, carbonate formation and photosynthesis, while photosynthetic organisms raised oxygen.
Watch for: Do not describe Fuels and Earth science only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
09Separate chemistry 2
Specification reference: C9
Polymer properties depend on chain forces, cross-links and additives. Sorting and contamination affect recycling; landfill persists, and incineration may release pollutants although energy can be recovered. Evaluation depends on the material and use.
Watch for: Do not describe Separate chemistry 2 only at the observable level. Use the correct particles, bonding, energy change or quantitative relationship where the question requires it.
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Pearson Edexcel · Chemistry · GCSE · Chemistry · 1CH0
Issue 4, March 2024
Source checked: 2026-07-30. The current official specification controls assessment requirements and option choices.
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