The entropy of a sample of co2 increases as the co2 changes from
(1) gas to liquid (3) liquid to solid
(2) gas to solid (4) solid to gas

The answer is (4) solid to gas. The entropy is the measurement of disorder. The entropy of CO2 under different status will increase from solid to liquid to gas. So the answer is (4).

Density because it’s holyyy

The real answer is keeping the world healthy so we won’t die