Question 1

Question

A)Which fact is true during a fission chain reaction?(1 point)
Responses

The total number of protons will decrease over time.
The total number of protons will decrease over time.

The number of freely-moving neutrons decreases over time.
The number of freely-moving neutrons decreases over time.

The number of freely-moving neutrons increases over time.
The number of freely-moving neutrons increases over time.

The total number of protons will increase over time.
The total number of protons will increase over time.
Question 2
A)A neutron strikes an atom of uranium-235 to start a fission reaction. A student expresses this situation as 01n+235 92U
. Which statement describes why the expression is incorrect?(1 point)
Responses

The atomic number for uranium-235 is in the wrong location.
The atomic number for uranium-235 is in the wrong location.

The mass number for uranium-235 is in the wrong location.
The mass number for uranium-235 is in the wrong location.

A neutron should be expressed as 11H
, not 01n
.
A neutron should be expressed as 1 to the 1th power cap h, not 1 to the 0 power n.

A neutron should be expressed as 10n
, not 01n
.
A neutron should be expressed as 0 to the 1th power n, not 1 to the 0 power n.
Question 3
A)It is possible to make a model of a fission chain reaction with mousetraps and table tennis balls, with the balls placed on an armed trap. Which statement best explains why this is a good model?(1 point)
Responses

The table tennis balls represent nuclei that are split by neutrons and release energy.
The table tennis balls represent nuclei that are split by neutrons and release energy.

The table tennis balls represent neutrons that are released when the nucleus splits and cause other nuclei to split.
The table tennis balls represent neutrons that are released when the nucleus splits and cause other nuclei to split.

The table tennis balls represent protons that are released when the nucleus splits and cause other nuclei to split.
The table tennis balls represent protons that are released when the nucleus splits and cause other nuclei to split.

The table tennis balls represent nuclei that are split by protons and release energy.
The table tennis balls represent nuclei that are split by protons and release energy.
Question 4
A)A student writes out an equation to represent a fission reaction. How can the student check that the equation is correctly written?(1 point)
Responses

The number of atoms of each element should be the same in the products and reactants.
The number of atoms of each element should be the same in the products and reactants.

The total number of atoms in the products should be equal to the number of atoms in the reactants.
The total number of atoms in the products should be equal to the number of atoms in the reactants.

The total mass number of the reactants should equal the total mass number of the products.
The total mass number of the reactants should equal the total mass number of the products.

The mass number of the products should be equal to the atomic number of the products.
The mass number of the products should be equal to the atomic number of the products.
Question 5
A)Which change will always take place during nuclear fission?(1 point)
Responses

A nucleus will take in energy in large amounts, increasing its mass.
A nucleus will take in energy in large amounts, increasing its mass.

Nuclei will be produced with much larger mass numbers.
Nuclei will be produced with much larger mass numbers.

Several nuclei will combine into one nuclei.

Answer 1

Here are the answers based on the questions provided:

Question 1:
Which fact is true during a fission chain reaction?

• Response: The number of freely-moving neutrons decreases over time.

Question 2:
Which statement describes why the expression is incorrect?

• Response: The atomic number for uranium-235 is in the wrong location.

Question 3:
Which statement best explains why this is a good model?

• Response: The table tennis balls represent neutrons that are released when the nucleus splits and cause other nuclei to split.

Question 4:
How can the student check that the equation is correctly written?

• Response: The total mass number of the reactants should equal the total mass number of the products.

Question 5:
Which change will always take place during nuclear fission?

• Response: (This question appears to be incomplete based on the provided options; however, the expected change during nuclear fission would typically involve) nuclei being produced with much smaller mass numbers rather than larger ones.

Since the provided response options do not include this option about smaller mass numbers, please review the options again or provide them so that the correct answer can be clarified.