STUDY GUIDE: Unit 5 - Radioactivity

Match the following diagrams to the correct type of reaction and the overall energy change that occurs.

• In this reaction, energy is released.

• 
• The reaction is fission.

• 
• In this reaction, energy is absorbed.

• 
• The reaction is fusion.

• 

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NGSS.HS-PS1-4

Which type of reaction is shown in the diagram?

• A. fusion, because the reaction released energy

• B. fission, because the reaction absorbed energy

• C. fusion, because the reaction formed heavier nuclei

• D. fission, because the reaction formed lighter nuclei

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NGSS.HS-PS1-8

Which of the following BEST describes what occurs in a fusion reaction?

• Two low mass nuclei are joined to form one nucleus and gives off energy.

• A single nucleus divides into two or more nuclei and gives off energy.

• Electrons are shared between the nuclei.

• A chemical reaction occurs between the nuclei.

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NGSS.HS-PS1-8

• low temperature and high pressure

• high temperature and low pressure

• low temperature and low pressure

• high temperature and high pressure

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NGSS.HS-ESS1-1

NGSS.HS-PS1-8

How do nuclear fusion reactions differ from nuclear fission reactions?

• Nuclear fusion reactions convert all energy into mass.

• Nuclear fusion reactions follow the law of conservation of matter.

• Nuclear fusion reactions form lighter isotopes from heavier isotopes.

• Nuclear fusion reactions form heavier isotopes from lighter isotopes.

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NGSS.HS-PS1-8

A nuclear fission reaction and a nuclear fusion reaction are similar because both reactions

• form light nuclei from heavy nuclei.

• form heavy nuclei from light nuclei.

• absorb a large amount of energy.

• release a large amount of energy.

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NGSS.HS-PS1-8

The energy released during _____ reactions is much greater than the energy released during _____ reactions.

• endothermic; exothermic

• endothermic; chemical

• exothermic; nuclear

• nuclear; chemical

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NGSS.HS-PS1-4

Which nuclear equation represents a fusion reaction?

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NGSS.HS-ESS1-1

NGSS.HS-PS1-8

Radioactive elements each have their own predictable rate of decay, or​ (a)   , which is measured by the amount of time it takes ​ (b)   of the radioactive atoms to ​ (c)   .

• grow
• half-life
• decay
• half
• double
• double-life

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NGSS.HS-PS1-8

It takes (a)   half-lives for a radioactive substance to decay until only one quarter of the original substance remains.

• one
• two
• three
• four

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NGSS.HS-PS1-8