AQA GCSE Chemistry Revision Crossword 1

Across

1. An insoluble solid that emerges from a liquid solution during a chemical reaction.
4. The process of removing salt from seawater to make it potable (drinkable).
10. The minimum amount of energy that particles must have to react when they collide.
12. Using bacteria to produce soluble metal compounds from low-grade ores.
13. An experimental technique used to find the exact volume of an acid and alkali needed to neutralise each other.
16. The thermal decomposition of long-chain hydrocarbons into shorter, more useful alkanes and alkenes.
17. A "series" of organic compounds that have the same functional group and general formula.
18. The constant (6.02×1023) representing the number of particles in one mole of a substance.
22. A substance that increases the rate of reaction by providing an alternative pathway with lower activation energy.
23. Atoms of the same element with the same number of protons but a different number of neutrons.
25. The process of checking or adjusting an instrument to ensure its readings are accurate against a standard.
26. Ions that do not take part in a chemical reaction and remain unchanged in the solution.
33. The relationship between the relative quantities of substances taking part in a reaction (the molar ratio).
36. Different structural forms of the same element in the same physical state (e.g., diamond and graphite).
38. A type of reaction where a more reactive element takes the place of a less reactive element in a compound.
39. A liquid or solution that contains ions and can conduct electricity.
40. The loss of electrons or the gain of oxygen.
41. The maximum mass of a product that could possibly be produced in a reaction, calculated from the balanced equation.

Down

2. The strong force of attraction between oppositely charged ions in an ionic lattice.
3. A large molecule made of many repeating units called monomers.
5. A complex mixture designed as a useful product with specific properties (e.g., paint or fuel).
6. A reaction that transfers energy to the surroundings, usually as heat.
7. The tendency of a substance to vaporise or turn into a gas.
8. An atom or group of atoms that determine the chemical properties of an organic compound.
9. The reactant that is completely used up in a chemical reaction, determining the amount of product formed.
11. A reaction that takes in energy from the surroundings, resulting in a temperature decrease.
14. Particles that are between 1nm and 100nm in size, possessing a high surface-area-to-volume ratio.
15. A compound consisting of only hydrogen and carbon atoms.
19. The type of equilibrium where the forward and reverse reactions occur at the exact same rate.
20. Added to aluminium oxide to lower its melting point during electrolysis, saving energy.
21. Describes a substance that contains no water of crystallisation.
24. Polymers that do not melt when heated because they contain cross-links between polymer chains.
27. Organic compounds which are joined together in straight chains, branched chains, or non-aromatic rings (Higher context).
28. The principle stating that if a change is made to a system at equilibrium, the system shifts to counteract the change.
29. Molecules that naturally exist as pairs of atoms, such as N2, O2, or Cl2.
30. The physical result (the paper with spots) produced by a chromatography experiment.
31. A reaction where the products can react together to reform the original reactants.
32. Using plants to absorb metal compounds from the soil before harvesting and burning them.
34. The gain of electrons or the loss of oxygen.
35. The functional group −COOH found in organic acids like ethanoic acid.
37. The amount of substance in a certain volume of solution, measured in g/dm3 or mol/dm3.
42. The organic product formed when an alcohol reacts with a carboxylic acid.