1. The mass of 12 C is 12 u where 1 u = 1.660 559 ´ 10 - 27 kg. This mass is equ
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Question
1. The mass of 12C is 12 u where 1 u = 1.660 559 ´ 10-27 kg. This mass is equal to: the mass of the 12C nucleus. the mass of the 12C nucleus plus 6 electrons. the mass of 6 protons and 6 neutrons. the mass of the 12C nucleus plus 12 electrons.2. reaction is exothermic atomic number of each reactant must be less than 80 atomic number of each reactant must be greater than 40 reaction is endothermic
3. The activity of sample #2 is greater than that of sample #1. The half-life exhibited for sample #2 is greater than that for sample #1 The activity of sample #1 is greater than that of sample #2. The half-life exhibited for sample #1 is greater than that of sample #2.
4. Atomic number increases by one. Atomic number decreases by one. Atomic mass number decreases by one. None of the above choices are valid. a. the mass of the 12C nucleus. b. the mass of the 12C nucleus plus 6 electrons. c. the mass of 6 protons and 6 neutrons. d. the mass of the 12C nucleus plus 12 electrons.
2. If the sum total mass of reactants in a nuclear reaction is greater than that of product particles, then which of the following statements best describes the conditions of the reaction?Answer a. reaction is exothermic b. atomic number of each reactant must be less than 80 c. atomic number of each reactant must be greater than 40 d. reaction is endothermic
3. Sample #1 is made from an isotope with decay constant and sample #2 is made from an isotope with decay constant , where . Which of the following statements must be true?Answer a. The activity of sample #2 is greater than that of sample #1. b. The half-life exhibited for sample #2 is greater than that for sample #1 c. The activity of sample #1 is greater than that of sample #2. d. The half-life exhibited for sample #1 is greater than that of sample #2.
4. A radioactive isotope that emits a gamma quantum will change in what respect?Answer a. Atomic number increases by one. b. Atomic number decreases by one. c. Atomic mass number decreases by one. d. None of the above choices are valid.
Explanation / Answer
1)c
2)A
3)B
4)D
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