Across
- 2. A medicine containing an alkali used to cancel out some of the acid in the stomach to treat heat burn
- 4. Another word for irritant
- 6. Substances that attack metals, stonework and skin are called this
Down
- 1. Something made of particles that are very spread out and have no bonds between them
- 2. A substance that turns blue, and has a PH level of more than 7
- 3. Substance that is not acid or alkali. It has a PH level of 7
- 5. A substance that turns red and has a PH of less than 7