Chemistry

2. A substance that is able to increase the rate of a chemical reaction without itself being consumed or changed by the reacting chemicals.
4. A material that does not let heat and electricity travel through it easily.
6. The tiny particles that are the basic building blocks of all matter.
7. A chemical compound that tastes sour and forms a water solution which turns blue litmus paper red.
9. A very small particle that has a negative charge of electricity and travels around the nucleus of an atom.

1. Air-like substances that can move around freely. They are all around us in the air that we breathe.
2. The substances that let an electric charge to pass through it without difficulty.
3. A substance made of two or more metals or of a metal and nonmetallic materials.
5. A unit in the SI system that measures the work being done.
8. A glass container with a flat bottom and a small spout for pouring.