True Statements about Processes

Question

For a particular process, q = -20 kJ and w = 15 kJ. Which of the following statements is true?

Question 4 options:

The surroundings did work on the system.

∆E = 35 kJ

Heat flows from the system to the surroundings.

All of the above is true.

None of the above is true.

Answer 1

Since heat (q) is negative (- 20 kJ) this means the system lost heat to the surroundings

Since work (w) is positive (+ 15 kJ), this means that the surroundings did work on the system

The net effect is a loss of 5 kJ by the system to the surroundings

So, the true statements would be:

1. The surroundings did work on the system.
2. Heat flows from the system to the surroundings.