That do you know about gravity

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

1. list three scientific reasons cockroaches may fly.

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?