Chemistry Review

2. a testable statement or prediction
4. a set of controlled observations that test a hypothesis
5. a judgement based on the information obtained
6. a pure substance that cannot be broken down into simpler substances by physical or chemical change
8. the amount of mass per unit volume
10. a vertical column of elements in the periodic table
11. the weighted average mass of the isotopes of that element
13. the energy-releasing process by which a gas or vapor becomes a liquid
15. the smallest particle of an element that retains all the properties of that element
16. the amount of product produced when a chemical reaction is carried out
17. negatively charged particle
18. atomic mass unit 1/12 of carbon-12
21. a solution that contains more hydrogen ions than hydroxide ions
22. a heterogeneous mixture of intermediate-sized particles
23. space around the nucleus of an atom where the electron is found
24. a solution that contains more hydroxide ions than hydrogen ions
25. a horizontal row of elements in the periodic table
26. a technique used to separate the components of a mixture based upon mass

1. positively charged particle
3. In a chemical equation, the number written in front to a reactant or product
7. neutrally charged particle
9. center of the atom where protons and neutrons are formed
12. the ion with a negative charge
14. the atomic number is the number of protons in an atom
15. group 1 elements except for hydrogen
16. equal volumes of gasses at the same temperature contain equal number of particles
19. Group 17
20. a form of matter that flows to conform to the shape of the container
22. a bond where electrons are shared
23. an ion that has a positive charge