An airplane flies 2100 miles in 3hours. What is it’s average speed in miles per hour?

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

What is the difference between a substance "getting wet" and "being dissolved" in a liquid at the particulate level?

Asample of sea water contains 6.28g of sodium chloride per litre of solution. how many milligrams of sodium chloride would be contained in 15.0ml of this solution?