Chemistry Review

2. any substance that forms hydroxide ions (OH-) in a water solution
4. solid turning into gas
7. the number of electrons that are required to have a stable outer electron shell
8. trioxide, N2O3
11. tell you how many atoms of the element are contained in that compound
14. fluoride, NaF
16. variable, variable that is measured or observed
17. covalent, bonding with equal sharing of electrons
19. factor that does not change when the other variables change
20. have a fixed volume and a fixed shape
23. reaction, a hydrocarbon reacts with oxygen gas

1. positively charged ion
3. the atomic number of carbon
5. bond, formed when electrons are gained or lost in order to produce a stable ion
6. the number of neutrons in chlorine
9. when atoms of the same element have different numbers of neutrons
10. the number of valence electrons that fluorine has
11. method, an organized set of investigation procedures that scientists use to investigate a question that they have about the world
12. theory, explains how a natural phenomenon works and is supported by scientific evidence
13. positively charged particles in the nucleus of an atom
15. metals, group 1 on the periodic table
18. replacement reaction, when one element in a compound is replaced with the other single element
21. the smallest piece of matter that forms an element
22. gases, group 8 on the periodic table
24. graph, used to show the comparison between categories, groups, or types of similar things