Question

In which of these samples do the atoms have the least kinetic energy? bromine gas (75°C) bromine gas (60°C) liquid bromine (45°C) liquid bromine (10°C)

Answer 1

Gases have high kinetic energy: the molecules are moving much more than in a liquid or solid. You can cut out A and B. In the liquids, the difference is temperature. If a lower temperature is closer to being solid, and a solid has lower kinetic energy than a liquid, then C is the answer. Hope this helps.

Answer 2

The answer would be liquid bromine (10°C) because it has the lowest temperature. Hope this helps and have a great rest of your day!