Thermodynamics and Nuclear Energy — Test Answers

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Which best describes the first law of thermodynamics as compared to the second law of thermodynamics?

The first law describes how thermal energy can be destroyed but not how it can be created.

The first law describes how thermal energy is conserved but not the direction it moves.

The first law describes the direction thermal energy moves but not how it is conserved.

The first law describes how thermal energy can be created but not how it can be destroyed.

How would the system change if the container were placed on a hot plate?

Some kinetic energy would be produced.

The kinetic energy of the molecules would decrease.

The kinetic energy of the molecules would increase.

Some kinetic energy would be destroyed.

Which change occurs when an atom undergoes alpha decay?

The nucleus loses energy and remains the same element.

The nucleus gains a proton and a new element is produced.

The nucleus loses mass and a new element is produced.

The nucleus loses a neutron and remains the same element.

Which label belongs in the area marked Y?

Occurs when molecules are in direct contact

Must involve temperature differences between substances or objects

Involves the movement of fluids based on density differences

Can occur where there is little or no matter

Question text not available

Answer:

conserved

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