Practice test 1-2

1. Which of the following is not a physical property of water? a. It is a liquid at room temperature b. It has a boiling point of 100 C c. Potassium metal will ignite when placed in water d. It is transparent 2. Which of the following is indicative of a chemical reaction? a. Color change b. Release of heat c. Formation of a precipitate or gas d. All of the above 3. The chemical potential energy is stored in the form of a. Elements b. Chemical bonds c. Wavelengths d. Calories 4. In our atmosphere at 50  C iron is a solid, water is a liquid and nitrogen is a gas. Which comparisons would you expect to be true of a sample with the same number of molecules of each of the listed substances. a. The nitrogen molecules would have the largest volume and water molecules would be moving the most quickly. b. The iron atoms would have the largest volume and be moving the most quickly. c. The nitrogen molecules would have the largest volume and be moving the most quickly. d. The water molecules would have the largest volume and be moving the most quickly. 5. If 4 grams of hydrogen react with 32 grams of oxygen to form water, what mass of water is formed? a. 36 g b. 28 g c. 8 g d. 6 g 6. The number 0.0006010 when written in scientific notation is a. 6.010 x 10 -4

b. 0.601 x 10 -3 c. 60.1 x 10 -5 d. 6.01 x 10 -3 7. The metric prefix that is equivalent to 1000 is: a. Milli b. Nano c. Mega d. Kilo 8. The metric prefix micro is equivalent to: a. 10 1 b. 10 -9 c. 10 -6 d. 10 6 9. Which of the following descriptions of a subatomic particle is correct? a. An electron has a positive charge and very small mass compared to a proton and neutron. b. A neutron has no charge and a mass of 1 amu. c. A proton has a positive charge and a very small mass compared to that of an electron and neutron. d. An electron has a negative charge and a mass of 1 amu. 10. Which element's name is correctly matched with its symbol? a. Iron, Pb b. Gold, Au c. Sodium, S d. Potassium, P 11. Which element's name is correctly matched with its symbol? a. Sodium, Na b. Arsenic, Ar c. Manganese, Mg d. Carbon, Ca 12. Which element's name is correctly matched with its symbol? a. Iodine, K b. Lead, Ld c. Tungsten, T d. Oxygen, O

a. 1 b. 2 c. 3 d. 4 e. 5 19. Which unknowns are isotopes of the same element? a. 2 and 5 b. 2 and 4 c. 1 and 3 d. 1 and 4 20. You have and unknown element with 3 isotopes with the following mass numbers 72, 74, and 77. The masses of the isotopes are 72.0 amu, 74.0 amu, and 77.0 amu. The percent composition of isotopes in your sample is 25.0% (for mass number 72), 27.0% (for mass number 74), and 48.0% (for mass number 77). What is the atomic weight of this element? a. 74.3 amu b. 74.9 amu c. 75.2 amu d. 76.0 amu 21. Which of these elements is a halogen? a. Ar b. Na c. O d. Br 22. Which of these elements is not a metal? a. Potassium b. Aluminum c. Beryllium d. Krypton 23. Which of these elements is not a metal? a. Calcium b. Sulfur c. Sodium d. Galium 24. The total number of electrons that can occupy the third shell of an atom is? a. 2 b. 8 c. 10 d. 18

25. The maximum number of electrons that can occupy the 2p subshell is: a. 2 b. 3 c. 6 d. 10 26. Which of the following is the electron configuration for copper? a. [Ar]4s 2 3d 9 b. [Ar]4s 1 3d 10 c. [Ar]4s 2 4d 9 d. [Ar]4s 0 3d 8 27. The electron configuration for K + is: a. 1s 2 2s 2 2p 4 3s 2 3p 6 4s 2 b. 1s 2 2s 2 2p 4 3s 2 3p 6 4s 1 c. 1s 2 2s 2 2p 6 3s 2 3p 6 d. 1s 2 2s 2 2p 6 3s 2 3p 5 28. The electron configuration for S 2- is: a. 1s 2 2s 2 2p 4 3s 2 3p 6 4s 2 b. 1s 2 2s 2 2p 4 3s 2 3p 6 c. 1s 2 2s 2 2p 6 3s 2 3p 6 d. 1s 2 2s 2 2p 6 3s 2 3p 2 29. Which electron configuration is not correct? a. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 6 ; Fe b. 1s 2 2s 2 2p 6 3s 2 3p 5 ; Cl c. 1s 2 2s 2 2p 1 ; B 30. How many valence electrons are represented in the electron configuration: 1s 2 2s 2 2p 5 ? a. 5 b. 9 c. 7 d. 2 31. Which of these ions does not have the same electron configuration as krypton? a. K + b. Sr 2+ c. Br - d. Se 2-

27. C 28. C 29. A 30. C 31. A 32. B 33. C