CHEMISTRY TEST REVIEW

1. Label the parts of the atom below. electron neutron proton nucleus

2. All matter is made up of a. cells b. atoms c. molecules d. compounds

3. Which of the following is not an element? a. oxygen c. sodium chloride b. hydrogen d. nitrogen

4. A positively charged particle is a. an electron c. a neutron b. a proton d. an isotope

5. Which of the following would be found outside the nucleus of an atom? a. protons b. electrons c. neutrons d. protons and neutrons

6. A chemical formula like CO 2 represents a. an elementc. an atom b. an electron d. a compound

7. A substance made up of two or more elements that have chemically combined is a. a mixture c. an atom b. a compound d. an element

8. A substance that cannot be changed into simpler substances by a chemical change is called a (an) a. element. c. liquid. b. solid. d. mixture.

9. Al, Cu, N, and O are symbols for a. compounds. c. elements. b. mixtures. d. molecules.

10. The elements oxygen, sulfur, selenium and tellurium are all found in the same group (16) on the table. What do we know about the elements in that family? The have similar but not identical properties Periodic Table of Elements

11. In what family is neon found? Group What do we call those elements in that group? Noble Gases 13. Describe a property of those elements. Very nonreactive/inert

14. What element is in Group 16, Period 3? S 15. How many protons does an atom of this element have? What kind of element is it? nonmetal

17. Which element is a metalloid? a. S (Sulfur) c. Si (Silicon) b. Ba (Barium) d. Br (Bromine)

18. What are the physical properties of metals? Ductile (wires) Malleable (hammer) Good conductors of heat and electricity Have luster

19. What are the physical properties of nonmetals? Brittle (break) No luster Poor conductors of heat and electricity.

20. Identify the following: A. Atomic # 6 B. Atomic mass C. Mass # 12 D. # of protons 6 E. # of electrons 6 F. # of neutrons 12-6 = 6

5 B Boron He Helium Na Sodium Cl Chlorine What is the atomic number for Chlorine? 22. What is the atomic mass for Boron? 23. How many protons are in an atom of Na? 24. How many neutrons are in an atom of He? Use the information provided to answer the questions.

25. I am a member of the Boron family with 49 protons. 26. I have a total of 74 electrons in an atom. 27. I have an atomic mass of I have 8 neutrons in an atom. In W Fe O Use a periodic table to help you identify each element. Give its symbol for the answer.

29. Elements that are ductile, malleable and good conductors of heat are known as a. Nonmetals c. Metals b. Noble Gasesd. Metalloids

30. Elements brittle are known as a. Nonmetals c. Metals b. Noble Gasesd. Metalloids

31. Elements that have luster are known as a. Nonmetals c. Metals b. Noble Gasesd. Metalloids

32. Elements in the periodic table are arranged by a.atomic number b.atomic weight c.number of neutrons d.chemical reactivity

33. Elements at the left of the periodic table are known as a. Nonmetals c. Metals b. Noble Gasesd. Metalloids

34. Elements at the right of the periodic table are known as a. Nonmetals c. Metals b. Noble Gasesd. Metalloids

35. In sweetened tea, the sugar is called the a. solute.c. solvent. b. colloid. d. solution.

36. Which of the following would help sugar dissolve faster in water? a. stirring the water b. decreasing the solubility of sugar c. using larger particles of sugar d. decreasing the water temperature

37. Describe the difference between a soluble and insoluble substance. Soluble: can dissolve Insoluble: cannot be dissolved

38. Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles? a. Use tweezers to separate them. b. Add water to the mixture. c. Use a magnet to separate them. d. Pour the mixture into a filter.

39. What is the solubility of KCl at 40°C? 40 g salt/100g water 40. What is the solubility of NaCl at 10°C? 35 g salt/100g water 41. What is the solubility of K 2 Cr 2 O 7 at 80°C? 58 g salt/100g water Solubility Curves

42. PHYSICAL OR CHEMICAL CHANGE? PHYSICAL

43. PHYSICAL OR CHEMICAL CHANGE? CHEMICAL

44. PHYSICAL OR CHEMICAL CHANGE? CHEMICAL

45. PHYSICAL OR CHEMICAL CHANGE? PHYSICAL

46. Identify the solid, liquid and gas! Support your answer. Gas Molecules very far apart Solid Molecules packed close together Liquid Molecules a little farther apart

Heat (thermal energy) Temperature º C A B C D E melting freezing condensing boiling 47. Label the phase changes in the heating curve below:

48. The particles of a substance are closest together in a. a solid b. a liquid c. a gas d. plasma

49. The particles of a substance move most readily in a. a solid b. a liquid c. a gas

50. The particles of a substance that does not have a definite volume or shape is a. a solid c. a liquid b. a gas d. plasma

51. When a liquid becomes a solid, energy a. does not change b. is released c. is absorbed d. is first absorbed, then released

52. _______ is the process in which liquid changes to gas. a. Sublimation c. Condensation b. Evaporationd. Melting

53. The change of a liquid to a solid is called a. freezing c. melting b. sublimationd. vaporization

54. During which of the following processes is there a decrease in the heat content of the form of water indicated? a. Ice as it forms on a lake b. Water droplets as they fall to the ground c. Water as it evaporates from a pond d. Snow as it melts on a mountainside

55. When substances go directly from the solid phase to the gas phase, the phase change is called a. sublimationc. condensation b. evaporationd. vaporization

Click on the links below to review : Phases of Matter f_matter/ Mixtures mixture.html

gas liquid solid condensation Freezing evaporation melting sublimation

temperature heat It increases Stays the same Its melting 0 and 100 degrees Celsius Stays the same

80°C 20°C liquid The move faster and farther apart. No, because the melting point of water is 0°C and the boiling point is 100°C

The slow down and come closer together. Heat must be removed/released. Temperature does not change during a phase change. 0°C solid freezing liquid condensatio n gas