1. When two or more elements join together chemically, a.the physical properties of the substances remain the same. b.a mixture is formed. c.a substance that is the same as the elements is formed. d.a compound is formed.

2. An atom of carbon with 6 protons, 6 electrons, and 6 neutrons would have a mass number of a.15.b. 18. c. 6.d. 12.

3. Physical science includes the study of ____________________ and ____________________.

4. What is the smallest particle into which an element can be divided and still be the same substance? a.electronc.proton b.neutrond.atom

5. Which of the following is the best definition of science? a. the process of memorizing answers about the natural world b. the process of gathering knowledge about the natural world c. the process of gathering knowledge about the ancient world d. the process of reading the knowledge of the known world

6. The horizontal row on the period table is called a(n) a.atomic number. b.group. c.period. d.family.

7. Boyle’s law states that for a fixed amount of gas a. at a constant temperature, the volume of the gas is inversely related to pressure. b. at a constant temperature, the volume of the gas is directly related to pressure. c. at a constant pressure, the volume of the gas is directly related to temperature. d. at a constant pressure, the volume of the gas is inversely related to temperature.

8. How would you describe the nucleus? a.tiny, negatively charged b.dense, negatively charged c.large, positively charged d.dense, positively charged

9. What happens when a liquid becomes a gas? a.The particles move closer together. b.The particles give off energy. c.The particles break away from each othe d.The particles slow down.

10. What are most of the elements in the periodic table?

11. What is physical science mainly about? a.the relationship between molecules and matter b.the relationship between matter and energy c.the relationship between light and energy d.the relationship between matter and light

12. How does a physical change differ from a chemical change? a.In a physical change new volumes are create b.In a physical change the change is reversible. c.In a physical change the composition is unchanged. d.In a physical change new materials are produced.

13. Which of the following is NOT true of compounds? a.They do not form randomly. b.They form after a physical change. c.They have their own physical properties. d.They contain two or more elements.

14. a charged atom that forms when the numbers of electrons and protons are not equal

15. According to Charles’s law a.decreasing the temperature of a gas causes the pressure on the molecules to decrease. b.increasing the temperature of a gas causes the volume of a gas to increase. c.increasing the temperature of a gas causes the pressure on the molecules to increase. d.decreasing the temperature of a gas causes the volume of a gas to increase.

16. The elements to the right of the zigzag line on the period table are called

17. How is a compound different from a mixture? a.Solids, liquids, and gases can form compounds. b.Compounds have two or more components. c.Each substance in a compound loses its characteristic properties. d.Compounds are commonly found in nature.

18. In a(n) ____________________ change, energy is added to a substance.

19. Why can salt dissolve in water? a.Salt is a solution. b.Salt is the solvent. c.Salt is an element. d.Salt is soluble.

20. the sum of the protons and neutrons in an atom

21. Where are electrons likely to be found? a.mixed throughout an atom b.paths, or energy levels c.the nucleus d.electron clouds

22. negatively charged particle

23. particle of the nucleus with no electrical charge

24. subatomic particle that has a positive charge

25. atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons

26. The number at the top is the

27. The number beneath carbon indicates the

28. Which letters on the graph represent the three states of matter: gas, solid, and liquid?

29. What happens if the number of electrons and protons are not equal?

30. State the periodic law.

31. Describe some of the signs that a chemical change is taking place. Provide everyday examples for each clue.