Chemistry

6. The process in which a liquid changes into a gas at the surface
8. The study of the composition, structure, and properties of matter
9. The chemical symbol for gold
13. The process in which two or more substances combine to form a new substance
15. The state of matter in which the substance has no definite shape but has a definite volume
18. A substance that cannot be broken down into simpler substances
19. The number of protons in an element
22. A substance made up of only one kind of atom
23. The basic building block of matter
24. A substance that speeds up a chemical reaction
25. A substance formed by the combination of two or more elements
27. The sum of the protons and neutrons in an element
28. The state of matter in which the substance has a definite shape and volume
29. A compound that has a pH less than

1. The ability of an atom to attract electrons to itself in a chemical bond
2. A measure of the amount of heat energy required to raise the temperature of a substance
3. The amount of a substance that can dissolve in a given amount of solvent at a given temperature
4. A measure of the amount of matter in an object
5. A measure of the amount of space occupied by an object
7. The number of protons plus neutrons in an element
10. The state of matter in which the substance has no definite shape or volume
11. A type of chemical bond in which electrons are shared between atoms
12. The number of electrons in an atom's outermost energy level
14. A measure of the average kinetic energy of the particles in a substance
16. A compound that has a pH greater than
17. A type of chemical bond in which electrons are transferred between atoms SUBLIMATION A process in which a solid changes directly into a gas without passing through the liquid phase
20. The force of attraction between atoms that holds them together
21. The smallest unit of an element
26. The measure of acidity or alkalinity of a substance