Atomic Origins Multiple Choice Slides 2015-10-27 www.njctl.org - - PDF document

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Atomic Origins

Multiple Choice Slides

2015-10-27 www.njctl.org

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1 What was the first particle discovered inside an atom? A Proton B Neutron C Electron D Nucleus

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1 What was the first particle discovered inside an atom? A Proton B Neutron C Electron D Nucleus

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Answer C

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2 What characteristic of cathode rays led scientists to believe that they were negatively charged? A They were small B They were easily deflected C The were deflected towards a positive electrode D They moved quickly

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2 What characteristic of cathode rays led scientists to believe that they were negatively charged? A They were small B They were easily deflected C The were deflected towards a positive electrode D They moved quickly

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Answer C

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3 Millikan discovered the charge of this subatomic particle by calculating the charge of small oil droplets. A Electron B Neutron C Proton D Nucleus

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3 Millikan discovered the charge of this subatomic particle by calculating the charge of small oil droplets. A Electron B Neutron C Proton D Nucleus

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Answer A

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4 Of the three types of radioactivity characterized by Rutherford, which are particles? A α-rays, β-rays, and γ-rays B γ-rays C α-rays and γ-rays D α-rays and β-rays

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4 Of the three types of radioactivity characterized by Rutherford, which are particles? A α-rays, β-rays, and γ-rays B γ-rays C α-rays and γ-rays D α-rays and β-rays

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Answer D

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5 Which form of radiation has a positive charge? A α B β C γ D δ

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5 Which form of radiation has a positive charge? A α B β C γ D δ

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Answer A

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6 The gold foil experiment __________. A confirmed the plum-pudding model of the atom B led to the discovery of the atomic nucleus C was the basis for Thomson's model of the atom D utilized the deflection of beta particles by gold foil

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6 The gold foil experiment __________. A confirmed the plum-pudding model of the atom B led to the discovery of the atomic nucleus C was the basis for Thomson's model of the atom D utilized the deflection of beta particles by gold foil

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Answer B

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7 The nucleus of an atom does not contain __________. A subatomic particles B protons or neutrons C neutrons D electrons

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7 The nucleus of an atom does not contain __________. A subatomic particles B protons or neutrons C neutrons D electrons

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Answer D

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8 Which subatomic particle has the smallest mass? A Proton B Neutron C Electron D Nucleus

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8 Which subatomic particle has the smallest mass? A Proton B Neutron C Electron D Nucleus

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Answer C

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9 Which subatomic particle has a positive charge? A Proton B Neutron C Electron D Nucleus

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9 Which subatomic particle has a positive charge? A Proton B Neutron C Electron D Nucleus

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Answer A

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10 The atomic number indicates __________. A the number of neutrons in a nucleus B the total number of neutrons and protons in a nucleus C the number of isotopes of an element D the number of protons in an atom

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10 The atomic number indicates __________. A the number of neutrons in a nucleus B the total number of neutrons and protons in a nucleus C the number of isotopes of an element D the number of protons in an atom

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Answer D

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X 6

11 In the symbol, C, x is __________. A the number of neutrons B the atomic number C the mass number D the isotope number

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X 6

11 In the symbol, C, x is __________. A the number of neutrons B the atomic number C the mass number D the isotope number

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Answer C

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12 There are ________electrons, _________protons, and ________neutrons in an atom of Cs. A 132, 132, 54 B 54, 54, 132 C 78, 78, 54 D 55, 55, 78

133 55

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12 There are ________electrons, _________protons, and ________neutrons in an atom of Cs. A 132, 132, 54 B 54, 54, 132 C 78, 78, 54 D 55, 55, 78

133 55

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Answer D

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13 How many electrons are in an Iron atom? A 23 B 26 C 27 D 28

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13 How many electrons are in an Iron atom? A 23 B 26 C 27 D 28

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Answer B

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238 92 232 90 4 2

14 In balancing the nuclear reaction U # E + He, the identity of element E is A Pu B Np C Th D Pa

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238 92 232 90 4 2

14 In balancing the nuclear reaction U # E + He, the identity of element E is A Pu B Np C Th D Pa

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Answer C

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210 84 206 82

15 This reaction Po # Pb + _____ is an example of _______. A alpha decay B beta emission C gamma emission D positron emission

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210 84 206 82

15 This reaction Po # Pb + _____ is an example of _______. A alpha decay B beta emission C gamma emission D positron emission

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Answer A

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16 The missing product from this reaction is __________. I # Te + _____

4 2

• 1

1 1

A He B e C n D e

121 53 121 52

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16 The missing product from this reaction is __________. I # Te + _____

4 2

• 1

1 1

A He B e C n D e

121 53 121 52

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Answer D

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17 This reaction is an example of __________. A alpha decay B beta decay C positron decay D electron capture E gamma emission

41Ca → 19K + _____ 20 41

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17 This reaction is an example of __________. A alpha decay B beta decay C positron decay D electron capture E gamma emission

41Ca → 19K + _____ 20 41

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Answer C

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18 Which isotope has 45 neutrons?

80 36 80 35 78 34 34 17

A Kr B Br C Se D Cl

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18 Which isotope has 45 neutrons?

80 36 80 35 78 34 34 17

A Kr B Br C Se D Cl

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Answer B

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19 Bombardment of uranium-235 with a neutron generates tellurium-135, 3 neutrons, and __________. A zirconium-98. B krypton-101. C krypton-103. D strontium-99.

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19 Bombardment of uranium-235 with a neutron generates tellurium-135, 3 neutrons, and __________. A zirconium-98. B krypton-101. C krypton-103. D strontium-99.

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Answer A

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20 The reaction shown below is responsible for creating 14C in the atmosphere. What is the bombarding particle? A alpha particle B electron C neutron D positron

147N + ____ → 146C + 11H

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20 The reaction shown below is responsible for creating 14C in the atmosphere. What is the bombarding particle? A alpha particle B electron C neutron D positron

147N + ____ → 146C + 11H

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Answer D

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21 What happens to the mass number and the atomic number of an element when it undergoes beta decay? A Neither the mass number nor the atomic number change. B The mass number decreases by 4 and the atomic number decreases by 2. C The mass number does not change and the atomic number increases by 1. D The mass number does not change and the atomic number decreases by 2.

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21 What happens to the mass number and the atomic number of an element when it undergoes beta decay? A Neither the mass number nor the atomic number change. B The mass number decreases by 4 and the atomic number decreases by 2. C The mass number does not change and the atomic number increases by 1. D The mass number does not change and the atomic number decreases by 2.

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Answer C

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22 Which one of the following is a correct representation of a beta particle?

4 2 1

• 1

2 4

A e B e C e D β

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22 Which one of the following is a correct representation of a beta particle?

4 2 1

• 1

2 4

A e B e C e D β

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Answer C

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23 Which one of the following processes results in an increase in the atomic number? A gamma emission B positron emission C beta emission D alpha emission

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23 Which one of the following processes results in an increase in the atomic number? A gamma emission B positron emission C beta emission D alpha emission

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Answer C

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24 Of the following processes, which one changes the atomic number? A alpha emission B beta emission C electron capture D positron emission

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24 Of the following processes, which one changes the atomic number? A alpha emission B beta emission C electron capture D positron emission

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Answer B

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25 In what type of radioactive decay does the atomic number of the product increase by one? A alpha B beta C gamma D positron emission

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25 In what type of radioactive decay does the atomic number of the product increase by one? A alpha B beta C gamma D positron emission

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Answer B

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26 Which type of radioactive decay results in no change in mass number and atomic number for the starting nucleus? A alpha B beta C positron emission D gamma ray

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26 Which type of radioactive decay results in no change in mass number and atomic number for the starting nucleus? A alpha B beta C positron emission D gamma ray

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Answer D

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27 What happens to the mass number and the atomic number of an element when it emits an alpha particle? A The mass number remains unchanged while the atomic number decreases by one. B The mass number decreases by four and the atomic number decreases by two. C The mass number increases by four and the atomic number increases by two. D The mass number remains unchanged while the atomic number increases by one.

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27 What happens to the mass number and the atomic number of an element when it emits an alpha particle? A The mass number remains unchanged while the atomic number decreases by one. B The mass number decreases by four and the atomic number decreases by two. C The mass number increases by four and the atomic number increases by two. D The mass number remains unchanged while the atomic number increases by one.

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Answer B

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28 Different isotopes of a particular element contain the same number of __________. A protons B neutrons C protons and neutrons D subatomic particles

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28 Different isotopes of a particular element contain the same number of __________. A protons B neutrons C protons and neutrons D subatomic particles

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Answer B

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29 Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given below. The average atomic mass of the element is __________ amu. A 43.26 B 39.68 C 39.07 D 38.64 E 33.33

• 1. Isotope % Mass
• 2. 40X 13.01 40.10
• 3. 41X 6.98 41.00
• 4. 44X 79.99 43.98

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29 Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given below. The average atomic mass of the element is __________ amu. A 43.26 B 39.68 C 39.07 D 38.64 E 33.33

• 1. Isotope % Mass
• 2. 40X 13.01 40.10
• 3. 41X 6.98 41.00
• 4. 44X 79.99 43.98

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Answer A

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30 The beta decay of cesium-137 has a half-life of 30.0 years. How many years must pass to reduce a 25 mg sample of cesium-137 to 8.7 mg? A 46 B 32 C 3.2 D 52

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30 The beta decay of cesium-137 has a half-life of 30.0 years. How many years must pass to reduce a 25 mg sample of cesium-137 to 8.7 mg? A 46 B 32 C 3.2 D 52

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Answer D

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31 The half-life for beta decay of strontium-90 is 28.8

• years. A milk sample is found to contain 10.3 ppm

strontium-90. How many years would pass before the strontium-90 concentration would drop to 1.0 ppm? A 92.3 B 0.112 C 186 D 96.9

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31 The half-life for beta decay of strontium-90 is 28.8

• years. A milk sample is found to contain 10.3 ppm

strontium-90. How many years would pass before the strontium-90 concentration would drop to 1.0 ppm? A 92.3 B 0.112 C 186 D 96.9

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Answer D

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32 The half-life of I is 0.220 years. How much of a 500.0 mg sample remains after 24 hours? A 496 mg B 560 mg C 219 mg D 405 mg

131

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32 The half-life of I is 0.220 years. How much of a 500.0 mg sample remains after 24 hours? A 496 mg B 560 mg C 219 mg D 405 mg

131

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Answer B

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