If crown b is more dense than crown a then which is pure gold

The grooves or folds of the brain are called

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?

Once similarity and one difference between a mixture of elements and a mixture of compounds