Name: ______

1)____ Which particle has the least mass?

2)____ Which nuclide is used to investigate humanthyroid gland disorders?

a)carbon-14

b)potassium-37

c)cobalt-60

d)iodine-131

3)____ A change in the nucleus of an atom that convertsthe atom from one element to another elementis called

a)combustion

b)neutralization

c)polymerization

d)transmutation

4)____ Which particle is emitted from a hydrogen-3nucleus when it undergoes radioactive decay?

Base your answers to questions 5 through 7 on the information below.

Cobalt-60 is commonly used as a source of radiation for the prevention of food spoilage.Bombarding cobalt-59 nuclei with neutrons produces the nuclide cobalt-60. A foodirradiation facility replaces the cobalt-60, a source of gamma rays, when the radioactivitylevel falls to of its initial level. The nuclide cesium-137 is also a source of radiation forthe prevention of food spoilage.

5)Identify one emission spontaneously released by a cobalt-60 nucleus. ______

6)Determine the total number of years that elapse before an

original cobalt-60 source inan irradiation facility must be replaced.

7)Complete the nuclear equation provided for the decay of cesium-137.Your response must include the symbol, atomic number, and mass number of themissing particle.

8)____ What is the half-life of a radioisotope if 25.0 gramsof an original 200.-gram sample of the isotoperemains unchanged after 11.46 days?

a)2.87 d

b)3.82 d

c)11.46 d

d)34.38 d

Base your answers to questions 80 and 81 on the information below.

Scientists are investigating the production of energy using hydrogen-2 nuclei(deuterons) and hydrogen-3 nuclei (tritons). The balanced equation below represents onenuclear reaction between two deuterons.

9)State, in terms of subatomic particles, how a deuteron differs from a triton.

10)Identify the type of nuclear reaction represented by the equation.______

11)____ Which nuclear emission has the greatest massand the least penetrating power?

a)an alpha particle

b)a beta particle

c)a neutron

d)a positron

12)____ Which radioisotope has an atom that emits aparticle with a mass number of 0 and a charge of1?

a)3H

b)16N

c)19Ne

d)239Pu

13)____ In which type of reaction do two lighter nucleicombine to form one heavier nucleus?

a)combustion

b)reduction

c)nuclear fission

d)nuclear fusion

14)____ Which radioisotope is used to treat thyroiddisorders?

a)Co-60

b)I-131

c)C-14

d)U-238

15)Determine the total time that must elapse until only ¼ of an original sample of theradioisotope Rn-222 remains unchanged.______

Base your answers to questions 16 through 18 on the information below.

Hydrocarbons and fissionable nuclei are among the sources used for the production ofenergy in the United States. A chemical reaction produces much less energy than a nuclearreaction per mole of reactant.

The balanced chemical equation below represents the reaction of one molecule of ahydrocarbon with two molecules of oxygen.

The nuclear equation below represents one of the many possible reactions for onefissionable nucleus. In this equation, X represents a missing product.

16)Identify the type of organic reaction represented by the chemical equation. ______

17)On the labeled axes provided, draw a potential energy diagram for thereaction of the hydrocarbon with oxygen.

18)Write an isotopic notation for the missing product represented by X in the nuclearequation.

Regents Review _ Nuclear Energy1-2Created: February 2010