Practice Test: Chapters 4 and 25
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1 Name: Class: Date: Practice Test: Chapters 4 and 5 Matching a. Cathode Ray d. Isotopes b. Ion e. Electrons c. Neutrons. An atom that has lost or gained an electron. A beam of light composed of electrons 3. Particles in the nucleus with no charge 4. Particles inside an atom that have very little mass and take up most of the volume 5. Atoms that have the same number of protons but a different number of neutrons. a. Alpha particles d. Ion b. Periodic Law e. Atomic Mass c. Atomic Mass Unit 6. An atom that has gained or lost electrons 7. The apporximate mass of a proton or neutron 8. The weighted average of all of an elements isotopes 9. Helium nuclei 0. When elements are arranged in order of increasing atomic number, there is a periodic pattern of their physical and chemical properties Multiple Choice Identify the choice that best completes the statement or answers the question.. ) Which statement is true about the discovery of electrons? a. Electrons were discovered when an electric current was passed through gases at low pressures. c. Electrons were discovered after the TV tube was invented. b. Electrons were discovered in a tube filled with helium d. Electrons were discovered when anode rays were identified in an anode ray tube.
2 Name:. Rutherford s experiment produced which of the following results: a. All alpha rays passed through the gold foil. b. Some alpha rays passed through the gold foil in a straight line while most bounced back from the direction that they came. c. Most alpha rays passed through the gold foil in a straight line, some scattered as they passed through the foil and some bounced back from the direction that they came. 3. Which radioactive emission will not alter the mass of an atom? a. alpha c. gamma b. beta 4. Radon- decays by alpha emission, what element is produced? a. Ra-6 c. Pb-8 b. Po-8 d. Rn-6 5. The nucleus of an atom is _. a. Negatively charged and has a low c. Positively charged and has a low density. b. Positively charged and has a high density. 6. Chlorine-3 undergoes beta decay. What will be one of the products? a. Sulfur-3 c. Phosphorus-8 b. Argon-3 d. Chlorine All atoms are. a. positively charged, because they have more protons than electrons b. neutral, with the number of protons equaling the number of neutrons, which is equal to half the number of electrons density. d. Negatively charged and has a high density. c. negatively charged d. neutral, because they have the same number of protons and electrons. 8. In which of the following is the number of neutrons correctly represented? 4 75 a. Mg has 4 neutrons d. 33 As has 08 neutrons b. c. 9 9 F has 0 neutrons e. 38 9U has 46 neutrons Au has 79 neutrons 9. One atomic mass unit (amu) is exactly equal to... a. the mass of a helium nucleus c. one gram b. / the mass of a carbon- atom d. the mass of an electron
3 Name: 0. What kind of radiation is emitted when an unstable Uranium-38 isotope changes to a Thorium-34 isotope? a. Alpha particle c. Gamma ray b. Beta particle d. Positron. A cm thick piece of cardboard would be most effective in protecting against what type of radiation? a. alpha c. gamma b. beta d. x-rays. Consider and element Z that has two naturally occurring isotopes with the following % abundances: the isotope with a mass # of 0 is 5.0% abundant; the isotope with a mass of is 75.0% abundant. What is the average atomic mass for element Z? a..0 amu d..5 amu b. 0.5 amu e. 4.0 amu c..0 amu 3. How many neutrons are in an atom of Sulfur-34 a. 34 c. 8 b. 6 d The illustration above shows the gold-foil experiment conducted by Ernest Rutherford. According to the drawing, most of the positively charged particles that were shot at the foil went straight through the gold foil without changing course. After analyzing the results of this test, Rutherford concluded that a. atoms are completely solid c. an atom had a solid, positively charged nucleus surrounded by electrons b. atoms are made of positive and negative charges all mixed together d. gold atoms are more loosely packed than most other metal atoms 5. The splitting of a nucleus into smaller nuclei is known as... a. Fission c. Hydrolysis b. Fusion 6. Matter is made up of atoms that have positive centers of neutrons and protons surrounded by a cloud of negatively charged electrons.this statement is a... a. theory c. inference b. hypothesis d. observation 3
4 Name: 7. Which of the following ordered pairs of elements shows an increase in atomic number but a decrease in atomic mass? a. Ag to Pd c. Ge to Sn b. Co to Ni d. Cr to Mo 8. The above diagram shows a cathode ray being deflected by an electric field. Which plate is positively charged? a. A c. Neither one is charged b. B 9. Who was the man who lived from 460B.C. 370B.C. and was among the first to suggest the idea of atoms? a. Atomos c. Democritus b. Dalton d. Thomson 30. The smallest particle of an element that retains the properties of that element is a(n). a. atom c. proton b. electron d. neutron 3. Which of the following is true about subatomic particles? a. Electrons are negatively charged and are the heaviest subatomic particle. b. Protons are positively charged and the lightest subatomic particle. c. Neutrons have no charge and are the lightest subatomic particle. d. The mass of a neutron nearly equals the mass of a proton. 3. The particles that are found in the nucleus of an atom are. a. neutrons and electrons c. protons and neutrons b. electrons only d. protons and electrons 33. The atomic number of an element is the total number of which particles in the nucleus? a. neutrons c. electrons b. protons d. protons and electrons 34. An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are. a. 5 protons and 76 electrons c. 38 protons and 38 electrons b. 76 protons and 0 electrons d. 76 protons and 76 electrons 35. The sum of the protons and neutrons in an atom equals the. a. atomic number c. atomic mass b. nucleus number d. mass number 4
5 Name: 36. What does the number 84 in the name krypton-84 represent? a. the atomic number c. the sum of the protons and electrons b. the mass number d. twice the number of protons 37. Isotopes of the same element have different. a. positions on the periodic table c. atomic numbers b. chemical behavior d. mass numbers 38. The mass number of an element is equal to. a. the total number of electrons in the nucleus b. the total number of protons and neutrons in the nucleus c. less than twice the atomic number d. a constant number for the lighter elements 39. How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 5 contain? a. 50 protons, 50 electrons, 75 neutrons c. 0 neutrons, 50 protons, 75 electrons b. 75 electrons, 50 protons, 50 neutrons d. 70 neutrons, 75 protons, 50 electrons 40. Which of the following statements is NOT true? a. Atoms of the same element can have different masses. b. Atoms of isotopes of an element have different numbers of protons. c. The nucleus of an atom has a positive charge. d. Atoms are mostly empty space. 4. Which of the following isotopes has the same number of neutrons as phosphorus-3? a. 3 P c. Si 5 4 b. 3 S d. Si An unstable nucleus. a. increases its nuclear mass by fission c. emits energy when it decays b. increases its half-life d. expels all of its protons 43. The charge on a gamma ray is. a. + c. 0 b. d. 44. What particle is emitted in alpha radiation? a. electron c. helium nucleus b. photon d. hydrogen nucleus 45. A beta particle is a(n). a. photon c. helium nucleus b. electron d. hydrogen nucleus 46. The least penetrating form of radiation is. a. beta radiation c. alpha radiation b. gamma radiation d. X rays 47. What is the change in atomic number when an atom emits a beta particle? a. decreases by c. increases by b. decreases by d. increases by 48. Which symbol is used for an alpha particle? a. He c. He b. He d. He 5
6 Name: 49. What particle decomposes to produce the electron of beta radiation? a. proton c. electron b. neutron d. positron 50. What symbol is used for beta radiation? a. 0 e c. e 0 0 b. 0 e d. e 5. What particle is needed to complete this nuclear reaction? Rn Po + _ a. 4 He c. H b. 0 e d. n 0 5. When radium-6 (atomic number 88) decays by emitting an alpha particle, it becomes. a. polonium- c. radium- b. polonium-4 d. radon- 53. What particle does argon-39 (atomic number 8) emit when it decays to potassium-39 (atomic number 9)? a. neutron c. proton b. electron d. alpha particle 54. What particle is needed to complete the following nuclear equation? 56 Mn + 0 e 5 a. 56 Co c. 7 6 b. 7 Mn d Fe 58 Cr 6
7 Practice Test: Chapters 4 and 5 Answer Section MATCHING. ANS: B PTS:. ANS: A PTS: 3. ANS: C PTS: 4. ANS: E PTS: 5. ANS: D PTS: 6. ANS: D PTS: 7. ANS: C PTS: 8. ANS: E PTS: 9. ANS: A PTS: 0. ANS: B PTS: MULTIPLE CHOICE. ANS: A PTS:. ANS: C PTS: 3. ANS: C PTS: 4. ANS: B PTS: 5. ANS: B PTS: 6. ANS: B PTS: 7. ANS: D PTS: 8. ANS: C PTS: 9. ANS: B PTS: 0. ANS: A PTS:. ANS: A PTS:. ANS: D PTS: 3. ANS: C PTS: 4. ANS: C PTS: 5. ANS: A PTS: 6. ANS: A PTS: 7. ANS: B PTS: 8. ANS: B PTS: 9. ANS: C PTS: DIF: L REF: p. 0 OBJ: ANS: A PTS: DIF: L REF: p. 0 p. 0 OBJ: ANS: D PTS: DIF: L REF: p. 04 p. 05 p. 06 OBJ: 4.. STA: Ch..a 3. ANS: C PTS: DIF: L REF: p. 06 p. 07 OBJ: STA: Ch..a
8 33. ANS: B PTS: DIF: L REF: p. 0 OBJ: 4.3. STA: Ch..a 34. ANS: D PTS: DIF: L REF: p. 0 OBJ: 4.3. STA: Ch..a 35. ANS: D PTS: DIF: L REF: p. OBJ: 4.3. STA: Ch..a 36. ANS: B PTS: DIF: L REF: p. OBJ: 4.3. STA: Ch..a Ch..c 37. ANS: D PTS: DIF: L REF: p. p. 3 OBJ: 4.3. STA: Ch..c 38. ANS: B PTS: DIF: L REF: p. OBJ: 4.3. STA: Ch..a 39. ANS: A PTS: DIF: L REF: p. OBJ: 4.3. STA: Ch..a 40. ANS: B PTS: DIF: L REF: p. 0 p. p. 3 OBJ: 4.3. STA: Ch..c 4. ANS: B PTS: DIF: L3 REF: p. OBJ: 4.3. STA: Ch..c 4. ANS: C PTS: DIF: L3 REF: p. 800 OBJ: 5.. STA: Ch..c Ch..d 43. ANS: C PTS: DIF: L REF: p ANS: C PTS: DIF: L REF: p ANS: B PTS: DIF: L REF: p ANS: C PTS: DIF: L REF: p. 80 OBJ: 5.. STA: Ch..e 47. ANS: D PTS: DIF: L REF: p ANS: D PTS: DIF: L REF: p ANS: B PTS: DIF: L REF: p ANS: B PTS: DIF: L REF: p ANS: A PTS: DIF: L REF: p. 80 OBJ: 5.. STA: Ch..d 5. ANS: D PTS: DIF: L REF: p. 800 p. 804 OBJ: STA: Ch..d 53. ANS: B PTS: DIF: L REF: p. 80 OBJ: 5.. STA: Ch..d 54. ANS: C PTS: DIF: L3 REF: p. 803 p. 804 OBJ: 5.. STA: Ch..d
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