A 2.00 mL sample of a substance A has a density of 18.4 g/mL and a 5.00 mL sample of substance B has a density of 35.5 g/mL. Do you have an equal mass of substances A and
B? Explain your answer.

Compare and contrast physical changes with chemical changes.

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?