Which of the following would release the most heat upon cooling from 75°C to 50°C?
10g H2O(I)
15g Al(s)
25g Sa(s)
40g Sa(s)

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

Which characteristics can be used to differentiate star systems? check all that apply.