CHEM126 – CHAPTER 19 – BASIC HOMEWORK / NUCLEAR CHEMISTRY I

 

CHAPTER 19 BASIC HOMEWORK:

NUCLEAR CHEMISTRY I

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Question 1

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Question 2

 

What is the mass number?

 

 

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Question 3

 

What is the number of neutrons?

 

 

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Question 4

 

What is the number of electrons?

 

 

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Question 5

 

What is the atomic number?

 

 

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Question 6

 

Which of the following statements is INCORRECT regarding nuclear reactions?

Comparison of Chemical and Nuclear Reactions

 

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Question 7

 

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Question 8

 

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Question 9

 

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Question 10

 

The positively charged protons in the nucleus are held together by the strong force made possible by the presence of neutrons. Based on the graph in the supplement, which of the following statements are correct?

Graph on Nuclear Stability

 

 

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Question 11

 

Predict the mode of decay and the product for 32Si. (You need your periodic table for this and the following questions.)

Predicting Nuclear Reactions

 

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Question 12

 

Predict the mode of decay and the product for 227Ac.
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Question 13

 

Predict the mode of decay and the product for 22Na.
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Explanation

Hint, there may be more than one mode of decay.

Question 14

 

To get to a stable nucleus, there may be a series of decays involving alpha and beta particles. How many alpha particles are emitted in the decay series that begins with 237Np and finally produces the stable isotope 209Bi?

Hint, take the time to write and balance the equation using Z and A.

 

 

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Question 15

 

How many beta particles are emitted?

 

 

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Question 16

 

130I decays by emission of beta particles to form stable 130Xe. A 3.00 g iodine sample containing some I-130 was recorded as having 1829 disintegrations per min. k = 0.00094 min -1. How many radioactive I-130 atoms are present in the sample?

Nuclear Decay is First Order

 

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Explanation

Hint, just use R = kN and solve for N.

Question 17

 

The radioactive decay of a sample containing an unknown radioactive isotope produced 8898 disintegrations per minute. 10.17 days later, the rate of decay was found to be 2898 disintegrations per minute. Calculate the half-life in days for the unknown radioactive isotope.

Half Life Calculation

 

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Question 18

 

A certain radioactive element has a half life of 7403 years. How much of a 7.76 g sample is left after 8663 years?
Half life calculation 2
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Question 19

 

The half-life of carbon-14 is 5,730 years. An artifact produces 13.9 disintegrations of 14C per minute per gram of carbon in the sample. Estimate the age of this sample assuming that its original radioactivity was 15.3 disintegrations per minute per gram of carbon.

Half Life Calculation 3

 

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Question 20

 

What is the energy released when 0.771 g are converted to energy? Express your answer in joules. For self-consistent units you must use kg because 1 J = 1 kg m2/s2.

Mass and Energy

 

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Question 21

 

What is the mass defect of 27Al in u? The mass of 1 atom of Al-27 is 26.9815 u.

Mass Defect

 

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Question 22

 

What is the nuclear binding energy per mole if the mass defect of a certain isotope is 0.0800 u per atom or 0.0800 g per mol? Express your answer in joules. Remember to use self-consistent units.

Nuclear Binding Energy

 

 

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