True or False: At room temperature and 1 atm, covalent crystals are solid.
a. True
b. False

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?

Which change to the system wood cause the freely-moving piston to lower?

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2