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jolli1 [7]
3 years ago
11

When a substance dissolves, it undergoes a _____.

Chemistry
2 answers:
babunello [35]3 years ago
7 0
A physical change.  chemical changes require the molecule itself to change.  If you put NaCl into solution, the NaCl is still there which is evident by the fact that if you lower the amount of water, NaCl precipitates out.
Viefleur [7K]3 years ago
7 0

The answer is a physical change. Hope this helps and have an amazing day. :)

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3 years ago
If a system performs 147 kJ of work while receiving 47 kJ of heat, what is change in its internal energy?
Verdich [7]

Answer:

-100 kJ

Explanation:

We can solve this problem by applying the first law of thermodynamics, which states that:

\Delta U = Q-W

where:

\Delta U is the change in internal energy of a system

Q is the heat absorbed/released by the system (it is positive if absorbed by the system, negative if released by the system)

W is the work done by the system (it is positive if done by the system, negative if done on the system)

For the system in this problem we have:

W = +147 kJ is the work done by the system

Q = +47 kJ is the heat absorbed by the system

So , its change in internal energy is:

\Delta U = +47 - (+147) =-100 kJ

6 0
2 years ago
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Answer:

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Explanation:

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