Across
- 4. a charge of negative electricity
- 6. an optical instrument used for viewing very small objects
- 8. a set of chemical symbols showing the elements present in a compoun
- 9. any chemical compound formed from the reaction of an acid
- 10. a substance or matter in a state in which it will expand freely
- 12. more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances
- 14. the basic unit of a chemical element
- 15. a charge of positive electricity
- 16. a subatomic particle of about the same mass as a proton but without an electric charge
- 18. to measure weight
- 20. a lipped cylindrical glass container for laboratory use
Down
- 1. an instrument for measuring the density of liquid
- 2. the chemical element of atomic number 29
- 3. a molecule or other entity that can donate a proton or accept an electron pair in reactions
- 5. close-fitting eyeglasses with side shields
- 7. a soft silvery-white reactive metal
- 11. a liquid mixture
- 13. an instrument for measuring and indicating temperature
- 17. the chemical element of atomic number 16
- 19. a thing that is composed of two or more separate element