00:01
In question number nine, it's asking which of the following changes is accompanied by the most negative value of e.
00:12
Well, let's refer to our delta e equation, where it is the sum of work plus q, which is heat.
00:22
So if we are adding heat, warming something up, q is positive.
00:28
If we are doing work on the system, then work is positive.
00:34
So to find out which one has the most negative delta e, we need to have the scenario that describes a negative work, meaning energy is being released as work, or the system is doing work on the environment, and we need to have a negative q, or heat is being released from the system, to the environment.
01:01
In the case of a spring being compressed and then heated, if it's compressed, then work is being done on the system to compress it.
01:15
And if it's heated, then heat is being added to it...