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# Five Radioactivity and Nuclear Chemistry Questions

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1- An injection containing 10.0pg 10 5 B was injected into a patient suffering from a brain tumor. The patient was irradiated by a neutron gun at the site of the tumor. Calculate the amount of energy released in megaelectronvolts given that 931 MeV is released for each 1 amu mass defect. To calculate the energy released, consider the isotopic masses as follows:

Element or particle = Isotopic mass (amu):
10 / 5 B = 10.0129
neutron= 1.0086
7 3 Li = 7.0160
alpha particle = 4.0026

2- Calculate the mass defect of the fluorine nucleus 19 /9 F. The mass of neutral 19 / 9 F is equal to 18.998403 atomic mass units. Express your answer in atomic mass units to four significant figures and u units

3- Calculate the binding energy E/ B of the fluorine nucleus 19 / 9 F .Express your answer in millions of electron volts to four significant figures and MeV units.

4-Calculate the binding energy per nucleon of the fluorine nucleus 19/ 9 F .Express your answer in millions of electron volts to four significant figures and MeV / nucleon units.

5- Calculate the mass defect of the helium nucleus 4 /2 He. The mass of neutral 4 /2 He is given by M/ He =4.002603u .Express your answer in atomic mass units to four significant figures and in u units.

#### Solution Preview

1. 10/5 B + 1/0 n ----> 4/2 He + γ + 7/3 Li

Mass defect = (4.0026 + 1.0086 + 7.0160) - (10.0129) = 2.0143 amu

Energy = 2.0143 amu x (931 MeV / 1 amu) = ...

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## Radioactivity and Nuclear Chemistry Questions

1. What is the correct name for the compound depicted in the skeletal structure below? (See attached file for diagrams)

2. Which of the following is a structural isomer of 2-methylpentane? Choose from:
cyclohexane
2-methyloctane
2,2-dimethylbutane
3-ethylheptane
n-butane

3. How many of the carbons in the molecule depicted below are chiral?

4. What kind of reaction converts an unsaturated hydrocarbon into a saturated one? Choose from:
substitution of a hydrogen with a halogen under high energy light
a hydrogenation reaction in the presence of a catalyst
addition of a halogen to an alkene
combustion reaction with oxygen

5. How would the compound shown below be classified?

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