Isabella filled a glass with warm water. She measured the temperature, and it was 30�c. She left the glass on a table in a room that was 20�c. A few hours later, she measured the water temperature again, and it was 24�c. Which best explains why the water temperature changed?.

Compare and contrast physical changes with chemical changes.

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.