Matter and Materials

4. A paper used to test the pH of substances.
7. Subatomic particles with no charge.
8. The third element on the Periodic Table.
9. This element, along with chlorine, form table salt.
12. A pure substance that is not made up of any other, simpler substances.
14. The limited movement of the particles of a solid.
16. The smallest unit of matter.
18. Substances with a pH of less than 7.
19. The name used for all subatomic particles found in the nucleus of an atom.
22. The element with an atomic number of 1.
24. Metals that can be found in Groups 3-12 on the Periodic Table.
27. The filament in an electric light bulb is made from this metal.
28. This metal is used to cover metals during the process of galvanising.
29. The center of an atom.

1. The movement of particles of a gas/liquid from an area where there are many, to an area where there are few.
2. The gas that is most common in the atmosphere.
3. An acid that contains sulphur.
5. This element is the most common element in soil.
6. The element with a chemical symbol of Br.
10. When a solid changes to a liquid.
11. This metal, which is liquid at room temperature, is also known as 'quicksilver'.
12. The subatomic particles in an atom with a negative charge.
13. When a solid changes phase to a gas.
15. The hardest substance on Earth.
17. The compound that consists of two atoms of hydrogen and one atom of oxygen.
20. Two or more atoms that chemically react with each other.
21. The inert gas after which Superman's home planet is named.
23. When a liquid changes phase to a gas.
25. The common name for the product of iron reacting with oxygen.
26. The gas used to fill balloons.