Across

1. 5noun A liquid in which another substance is dissolved. (8)
2. 7verb To mix completely into a liquid, like sugar in water. (8)
3. 9noun It speeds up a reaction without being used up. (8)
4. 11noun The element in all living things. Its symbol is C. (6)
5. 14noun A substance with only one type of atom, like gold. (7)
6. 15noun The link that holds atoms together. (4)
7. 16verb To make something warmer. (4)

Down

1. 1adjective Having a pH lower than 7. (6)
2. 2noun A glass container used in the lab. (5)
3. 3noun Two or more atoms bonded together. (8)
4. 4adjective Poisonous or harmful. (5)
5. 6noun A tiny particle with a negative charge. (8)
6. 8verb To find the size, amount or weight of something. (7)
7. 10noun Two or more substances combined but not bonded. (7)
8. 12noun The smallest unit of an element. (4)
9. 13verb To change chemically when mixed with something. (5)