Across
- 2. A group of atoms bonded together
- 4. Reaction with oxygen that releases heat and light
- 7. Substance formed in a chemical reaction
- 11. Starting substance in a chemical reaction
- 12. Electrons in the outermost shell
- 15. Type of bonding with a ‘sea of electrons’
- 16. Scale used to measure acidity or alkalinity
- 17. A reaction that releases heat
- 19. base Reaction where an acid reacts with a base to form salt and water
- 20. A substance that can dissolve in a solvent
- 21. Process that uses electricity to split compounds
Down
- 1. Reaction where a compound breaks down into simpler substances
- 3. Substance that speeds up a reaction without being used up
- 5. where two or more substances combine to form one product
- 6. A charged particle
- 8. An insoluble solid formed in a reaction
- 9. Substance that reacts with acids to form salt and water
- 10. The smallest unit of matter
- 13. Mixture of metals or metals with other elements
- 14. Table that arranges elements by atomic number
- 18. Reaction between acid and base