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Fission and Fusion 4 questions

Fission and Fusion

New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.

Fission splits a heavy nucleus into smaller nuclei. Fusion joins light nuclei into a heavier nucleus. Balance total mass number A and total atomic number Z.

Question 1

Which description represents fission?

  1. A heavy nucleus splits into smaller nuclei.
  2. Two light nuclei join into a larger nucleus.
  3. A neutral atom loses a valence electron.
  4. Two molecules form a hydrogen bond.

Question 2

Explain why two hydrogen nuclei joining to produce a helium nucleus is an example of fusion.

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Question 3

Which values represent a neutron in an A and Z balance?

  1. A = 0, Z = 1
  2. A = 1, Z = 0
  3. A = 1, Z = 1
  4. A = 4, Z = 2

Question 4

Explain why each side of a nuclear equation can have a different number of individual particles while its total A and Z still balance.

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Sorting Nuclear Reaction Models 4 questions

Sorting Nuclear Reaction Models

Use the information below to answer the questions.

Use the following records. Each pair lists (A, Z), and a coefficient counts how many times that pair occurs.

ModelBeforeAfter
P(235, 92) + (1, 0)(141, 56) + (92, 36) + 3(1, 0)
Q(2, 1) + (3, 1)(4, 2) + (1, 0)

Question 5

Which model shows fusion?

  1. P only
  2. Q only
  3. Both P and Q
  4. Neither model

Question 6

Check the A balance for P, including the emitted neutrons.

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Question 7

What is the total Z on the product side of Q?

  1. 0
  2. 1
  3. 2
  4. 4

Question 8

Use the particle identities in P to explain why it is fission.

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