Question

1. what does the first law of thermodynamics state? ___

Explanation:

The First Law of Thermodynamics is a statement of energy conservation. It states that the change in the internal energy of a closed - system is equal to the heat added to the system minus the work done by the system. Mathematically, $\Delta U = Q - W$, where $\Delta U$ is the change in internal energy, $Q$ is the heat transfer, and $W$ is the work done.

Answer:

The change in the internal energy of a closed - system is equal to the heat added to the system minus the work done by the system ($\Delta U = Q - W$).