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Across 1. A substance after a chemical reaction. 6. 7 on the Ph scale. 11. A fuel containing H and C. 12. Material made of one type of atom. 13. A table of elements. 15. The left and larger side of the periodic table. 16. The tiny particles that build up all matter(i.e. stuff) around us 18. When something gets put into a flame. 19. A reaction that gets cooler. 20. The gas inside the gas taps. 21. two different types of atoms chemically bonded together.

Down 2. A gas we breathe in. 3. A compound gas that we breathe out. 4. 8-12 On the Ph Scale. 5. When two different substances join together to create a new substance. E.g. Copper + Oxygen -> Copper Oxide 6. The right and smaller side of the periodic table. 7. A substance before a chemical reaction. 8. A scale from 1-12 that rates acid, alkali and neutrals. 9. Another (more scientific) word for burning. 10. Mg on the periodic table. 14. A reaction that gets warmer. 16. 1-6 on the Ph Scale. 17. Something you burn that gives off energy