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