Chemistry

4. a variable whose variation does not depend on that of another.
8. a part or aspect of something abstract.
9. firm and stable in shape.
10. an airlike fluid substance which expands freely to fill any space available.
12. the measurement or extent of something from end to end.
13. a group of atoms bonded together, representing the smallest unit of a chemical compound that can take part in a chemical reaction.
15. branch of science that deals with identification of substances of which matter is composed, the investigation of their properties and the ways in which they interact, combine, and change, and the use of these processes to form new substances.
17. variable whose value depends on that of another.
19. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

1. relating to or denoting chemical bonds formed by the sharing of electrons between atoms.
2. a proposed explanation made on the basis of limited evidence.
3. energy that a body possesses by virtue of being in motion.
5. an amount of space between two things or people.
6. an electron in the outer shell of an atom which can combine with other atoms to form molecules.
7. safety precautions taken to prevent injury in laboratories.
11. study of the structure and behavior of the physical and natural world through observation and experiment.
13. a large body of matter with no definite shape.
14. having a consistency like that of water or oil.
16. physical substance in general, as distinct from mind and spirit that which occupies space and possesses rest mass.
18. the amount of space that a substance or object occupies.