AQA Paper 1 Selected Topics

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Across
  1. 2. A substance that is formed in a chemical reaction.
  2. 4. A pure substance made from only one type of atom.
  3. 7. The organelle where proteins are made in a cell.
  4. 10. A negatively charged particle found in energy levels around the nucleus.
  5. 12. The movement of water through a partially permeable membrane from a dilute to a concentrated solution.
  6. 13. A reaction that transfers energy to the surroundings, usually as heat.
  7. 15. A positively charged particle found in the nucleus of an atom.
  8. 18. Bonding in metals where positive ions are attracted to a sea of delocalised electrons.
  9. 19. A type of bonding formed when electrons are transferred from one atom to another.
Down
  1. 1. The minimum amount of energy needed for a reaction to occur.
  2. 3. Atoms of the same element with the same number of protons but different numbers of neutrons.
  3. 4. A reaction that takes in energy from the surroundings.
  4. 5. A particle with no charge found in the nucleus of an atom.
  5. 6. The movement of particles from an area of high concentration to low concentration.
  6. 8. The organelle in cells where aerobic respiration takes place.
  7. 9. A substance formed when two or more different elements are chemically bonded together.
  8. 11. The basic structural and functional unit of all living organisms.
  9. 14. A type of bonding where atoms share pairs of electrons.
  10. 16. A substance that is used up during a chemical reaction.
  11. 17. The smallest part of an element that can take part in a chemical reaction.