KS3 Chemical Reactions Crossword

123456789101112131415161718192021
Across
  1. 3. A reaction that transfers energy to the surroundings.(10)
  2. 5. A physical change from one state of matter to another. For example, when a solid changes to a liquid.(6,2,5)
  3. 7. A substance that increases the rate of a chemical reaction.(8)
  4. 9. The average kinetic energy of the particles in a substance, measured in degrees Celsius (°C).(11)
  5. 11. A substance that is formed in a chemical reaction.(7)
  6. 12. A force that holds atoms together in molecules.(8,4)
  7. 13. An equation that uses only the names of the reactants and products to model a chemical reaction.(4,8)
  8. 17. A reaction in which the products can react to produce the original reactants. Represented by: A + B ⇌ C + D.(10,8)
  9. 18. A process that involves rearrangement of atoms to produce new substances.(8,8)
  10. 19. No atoms are lost or made during a chemical reaction so the mass of the products equals the mass of the reactants.(12,2,4)
  11. 20. A reaction that takes in energy from the surroundings.(11)
  12. 21. The loss of electrons from a substance or the gain of oxygen by a substance.(9)
Down
  1. 1. When bubbles are observed due to the production of a gas in a chemical reaction.(13)
  2. 2. A substance made of more than one atom held together by covalent bonds.(8)
  3. 4. The smallest part of an element that can exist.(4)
  4. 6. Stores energy in a chemical store which it can release as heat.(4)
  5. 8. A reaction in which a single reactant breaks down when heated, forming two or more products.(7,13)
  6. 10. A reaction between a substance and oxygen in the air. The scientific word for burning.(10)
  7. 14. A substance that takes part in a chemical reaction.(8)
  8. 15. To mix a solute with a solvent to form a solution.(8)
  9. 16. A measure of how quickly a reactant is used up or a product is formed in a chemical reaction.(4,2,8)