A. blue B. green C. red D. violet
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1 1. A chemistry class determines that each atom of a metallic element contains 26 protons and 30 neutrons. When the teacher asks the class what the element is, half the class says iron and half the class says zinc. What is the element? A. Iron, because iron s atomic number is 26. B. Zinc, because zinc s atomic number is 30. C. Iron, because the atomic weight of the substance is 66. D. Zinc, because the atomic weight of the substance is The diagram below shows two forms of lithium, labeled I and II: 4. Shown below is a model of the structure of atom X. Which is the atomic number of X? A. 4 B. 6 C. 12 D Which model best shows the structure of the atom? How are forms I and II different? A. They exist as ions with different oxidation states. B. They have the same number of protons but different reactivities. C. They have different numbers of neutrons and so exist as isotopes. D. They have different numbers of electrons and thus different charges. 3. What is the mass of an atom with 34 protons, 34 electrons, and 45 neutrons? A. 34 amu B. 68 amu C. 79 amu D. 113 amu A. B. C. D. 6. If an electron in a hydrogen atom falls from n = 6 to n = 2, what color of visible light will be emitted? A. blue B. green C. red D. violet
2 7. Which statement describes the differences between the visible and ultraviolet regions of the electromagnetic spectrum? A. The visible region has a lower frequency and wavelength than the ultraviolet region. B. The visible region has a higher frequency and wavelength than the ultraviolet region. C. The visible region has a higher frequency and a lower wavelength than the ultraviolet region. D. The visible region has a lower frequency and a higher wavelength than the ultraviolet region. 8. How does the Bohr model explain the source of the light produced by excited atoms? A. It is the energy absorbed by an electron that moves from a higher to a lower energy level. B. It is the energy absorbed by an electron that moves from a lower to a higher energy level. C. It is the energy given off by an electron that moves from a higher to a lower energy level. D. It is the energy given off by an electron that moves from a lower to a higher energy level. 9. Which is the order of the electromagnetic spectrum from lowest to highest frequency? A. gamma rays, infrared rays, microwaves, X rays B. infrared rays, gamma rays, microwaves, X rays C. microwaves, infrared rays, X rays, gamma rays D. X rays, gamma rays, infrared rays, microwaves 10. The reaction below represents a decay reaction Bi Tl +? Which nuclear particle will complete the equation? A. a proton B. a neutron C. a beta particle D. an alpha particle 11. Which particle is commonly used to initiate a fission chain reaction? A. a proton B. a neutron C. a beta particle D. an alpha particle 12. Iodine 131 is a radioactive isotope used in the treatment of thyroid disorders. A dose of 25.0 mg of iodine 131 is administered to a patient. Approximately how much of a 25.0 mg sample of Iodine 131 will remain after 2 half lives? A mg B mg C mg D mg 13. Which two elements from the periodic table will react most similarly to each other? A. two elements from the same row B. two elements from the same column C. two elements that are in neighboring columns D. two elements on opposite sides of the periodic table 14. Which of these elements is a metalloid? A. cobalt B. fluorine C. lithium D. silicon 15. Which atom has the greatest atomic radius? A. aluminum B. magnesium C. sodium D. sulfur
3 16. The table compares the ionization energies of four elements in the same period and shows the resulting change in radius for each. 20. Which correctly names the chemical formula, Fe 2 (SO 4 ) 3? A. iron sulfide B. iron sulfate C. iron(ii) sulfate D. iron(iii) sulfate 21. What is the formula for the compound vanadium(vi) phosphate? Which element is most likely an alkali metal? A. 1 B. 2 C. 3 D Which represents the electron configuration for a noble gas? A. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 7 B. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4 C. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 3 D. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p The configuration below represents an element. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 5 Which element is being represented? A. arsenic B. bromine C. germanium D. krypton 19. Which of these elements has the most d electrons in its outermost shell? A. chromium B. iron C. scandium D. zinc A. V(PO 4 ) 2 B. V 3 (PO 4 ) 6 C. V 2 PO 4 D. V 6 PO Which formula has a name that includes trioxide? A. SO 3 B. Al 2 O 3 C. Fe 2 O 3 D. NaNO Which name is given to the compound with the chemical formula CuCl2? A. Copper(II) chloride B. Copper(IV) chloride C. Cupric(IV) dichloride D. Cuprous(IV) dichloride 24. Which is the chemical formula for magnesium phosphate? A. MgPO 4 B. Mg 3 PO 4 C. Mg(PO 4 ) 3 D. Mg 3 (PO 4 ) Which chemical formula is written correctly? A. Al 2 SO 4 B. MgNO 3 C. (NH 4 ) 3 CO 3 D. Ca(C 2 H 3 O 2 ) 2
4 26. An atom of an element with atomic number 48 and mass number 120 contains: A. 48 protons, 48 electrons, and 72 neutrons B. 72 protons, 48 electrons, and 48 neutrons C. 120 protons, 48 electrons, and 72 neutrons D. 72 protons, 72 electrons, and 48 neutrons 27. According to the equation: X Pb He The nucleus correctly represented by X is A Hg B Po C Bi D Pb 28. A radioactive element has a half-life of 2 days. Which fraction represents the amount of an original sample of this element remaining after 6 days? A. 1/2 B. 1/3 C. 1/4 D. 1/8 29. If an electron in a hydrogen atom falls from n = 2 to n = 1, what type of electromagnetic radiation will be emitted? A. infrared B. visible C. ultraviolet D. X-ray 30. How many milligrams are in 2.5 kg? 31. What is the volume of 60.0 g of ether if the density of ether is 0.70 g/ml? A. 86 ml B. 1.2 x 10-2 ml C. 2.4 x 10-2 ml D. 42 ml 32. Chlorine boils at 239 K. What is the boiling point of chlorine expressed in degrees Celsius? A. 93 C B. 34 C C. -61 C D. -34 C 33. Which is an example of a chemical change? A. sugar dissolving in water B. water boiling when heated C. iron rusting from oxidation D. gallium melting in the palm of a person s hand 34. Which statement indicates a chemical property? A. Magnesium has a silver color. B. The boiling point of alcohol is 89.3 F. C. Sodium metal reacts violently with water. D. Water is found in three phases: solid, liquid, and gas. 35. Which process is a chemical change? A. boiling water B. melting snow C. shredding paper D. burning a matchstick A. 2.5 x 10-4 mg B. 2.5 x 10 1 mg C. 2.5 x 10 2 mg D. 2.5 x 10 6 mg
5 35. The diagram represents a reaction that occurs between concentrated sulfuric acid and table sugar. Based on the diagram, how is it evident that a chemical reaction is occurring? A. The sugar has dissolved in the sulfuric acid. B. A precipitate formed in the bottom of the beaker. C. The temperature of the test tube has decreased greatly. D. The steam given off indicates that a gas is being released.
6 Answer Key Question Answer Standard 1 A NCES.9_12.SC.CH C NCES.9_12.SC.CH C NCES.9_12.SC.CH B NCES.9_12.SC.CH D NCES.9_12.SC.CH D NCES.9_12.SC.CH D NCES.9_12.SC.CH C NCES.9_12.SC.CH C NCES.9_12.SC.CH D NCES.9_12.SC.CH B NCES.9_12.SC.CH B NCES.9_12.SC.CH B NCES.9_12.SC.CH D NCES.9_12.SC.CH C NCES.9_12.SC.CH D NCES.9_12.SC.CH D NCES.9_12.SC.CH B NCES.9_12.SC.CH D NCES.9_12.SC.CH D NCES.9_12.SC.CH A NCES.9_12.SC.CH A NCES.9_12.SC.CH A NCES.9_12.SC.CH.1.2.4
7 24 D NCES.9_12.SC.CH D NCES.9_12.SC.CH A NCES.9_12.SC.CH B NCES.9_12.SC.CH D NCES.9_12.SC.CH C NCES.9_12.SC.CH D NCES.9_12.SC.CH. 31 A NCES.9_12.SC.CH. 32 D NCES.9_12.SC.CH. 33 C NCES.9_12.SC.CH C NCES.9_12.SC.CH D NCES.9_12.SC.CH D NCES.9_12.SC.CH NCES.9_12.SC.CH. 38 NCES.9_12.SC.CH. 39 NCES.9_12.SC.CH. 40 NCES.9_12.SC.CH. 41 NCES.9_12.SC.CH. 42 NCES.9_12.SC.CH. 43 NCES.9_12.SC.CH. 44 NCES.9_12.SC.CH. 45 NCES.9_12.SC.CH.
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C101 Chapters 1 and 2 90 representative questions from old exams The questions are grouped by topic. Do these problems as homework to prepare for Exam 1. 1. Carbon is a metal/nonmetal that has the symbol.