Nuclear Fission and Nuclear Fusion — Unit test Answers

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Which is most likely why many scientists reject the cold fusion theory?

There is too much waste involved in the process.

Cold fusion experiments have been conducted at room temperature only.

The process does not produce enough energy to meet the needs of modern humans.

The original results have not been replicated consistently and reliably.

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Why is it important for scientists to replicate each other’s experiments?

to determine if important scientific results are repeatable

to help the research of other scientists

to determine if slight alterations in the experiment can affect the result

to further their own research

In alpha decay, alpha particles are ejected from the nucleus. Which equation represents alpha decay?

Superscript 241 subscript 95 upper A m right arrow superscript 237 subscript 93 upper N p plus superscript 4 subscript 2 upper H e.

Superscript 18 subscript 9 upper F right arrow superscript 18 subscript 8 upper O plus subscript 0 subscript 1 e.

Superscript 14 subscript 6 upper C right arrow superscript 14 subscript 7 upper N plus superscript 0 subscript negative 1 e.

Superscript 152 subscript 66 upper D y right arrow superscript 152 subscript 66 upper D y plus y.

What can form as a result of a chemical reaction?

compounds

isotopes

alpha particles

beta particles

What is a key difference between chemical and nuclear reactions?

In chemical reactions, new compounds are formed. In nuclear reactions, compounds are destroyed.

Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.

Chemical reactions involve large changes in energy. Nuclear reactions absorb or release small amounts of energy.

In chemical reactions, only alpha radiation is emitted. In nuclear reactions, alpha, beta, and gamma decay may occur.

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