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Question 16

A)
Use the equation to complete the activity.

21986
Rn→21584
Po+ Alpha

The nuclear equation shows the transmutation of a form of radon into polonium and an alpha particle. In one to two sentences, explain whether or not the reaction is balanced.

(1 point)
Responses

An alpha particle has 2 protons and 4 neutrons
An alpha particle has 2 protons and 4 neutrons

An alpha particle has 2 protons and neutrons
An alpha particle has 2 protons and neutrons

An alpha particle has 3 protons and 3 neutrons
An alpha particle has 3 protons and 3 neutrons

An alpha particle has 4 protons and 4 neutrons
An alpha particle has 4 protons and 4 neutrons
Question 17
A)
Use the equation to complete the activity.

21986
Rn + Beta→21985
As

The nuclear equation shows a form of radon into astatine and a beta particle. In one to two sentences, explain whether or not the reaction is balanced.

(1 point)
Responses

mass number is zero, and it is a neutron
mass number is zero, and it is a neutron

mass number is zero, it is a gamma.
mass number is zero, it is a gamma.

mass number is zero, it is a proton
mass number is zero, it is a proton

mass of beta is zero, and it is an electron
mass of beta is zero, and it is an electron
Question 18
A)Nuclear reactions can be written out in equation form with information about the nuclei that take place in the fusion reaction and the nuclei that are produced. Choose 2 answer choices below that best explain how you would identify the reaction as fusion.(2 points)
Responses

one or more nuclei must be coming together on the right side of the reaction
one or more nuclei must be coming together on the right side of the reaction

There will be a nucleus with a large number of protons on the right side of the reaction
There will be a nucleus with a large number of protons on the right side of the reaction

The largest mass number is present on the left side
The largest mass number is present on the left side

The largest number is present on the right side of the reaction
The largest number is present on the right side of the reaction
Question 19
A)
Use the equation to answer the prompt.

106
C→ 105
B + 0+1
e

A student claims that the equation models beta-minus decay because the atomic number of the nucleus decreases by one. In one or two sentences, explain the error in the student’s reasoning.

(2 points)
Responses

This equation models a beta plus decay
This equation models a beta plus decay

The equation models a beta-minus
The equation models a beta-minus

The student is correct
The student is correct

The student is incorrect because in beta-minus decay, the atomic number of the nucleus increases by one

1 answer

Question 16 Response:
The reaction is balanced because both the mass numbers and atomic numbers on either side of the equation are equal. The left side has a mass number of 219 and atomic number of 86 for radon, which balances with the mass number of 215 and atomic number of 84 for polonium plus the mass number of 4 and atomic number of 2 for the alpha particle.

Question 17 Response:
The reaction is balanced because the beta particle, which has a mass number of zero and is an electron, accounts for the decrease in atomic number from radon to astatine. Since the overall mass number remains unchanged and the atomic number decreases by one, the equation correctly reflects the process.

Question 18 Response:

  • One or more nuclei must be coming together on the right side of the reaction.
  • There will be a nucleus with a large number of protons on the right side of the reaction.

Question 19 Response:
The student is incorrect because in beta-minus decay, the atomic number of the nucleus increases by one, not decreases. The equation represents beta-plus decay, where a positron is emitted, thus reducing the atomic number.