Across
- 2. A substance that speeds up a chemical reaction
- 4. A type of chemical bond where electrons are transferred
- 6. A measure of the acidity or basicity of a solution
- 7. A type of chemical bond where electrons are shared
Down
- 1. A substance made up of only one type of atom
- 3. The smallest unit of matter that retains the properties of an element
- 5. A substance made up of two or more different types of atoms