How many atoms for each element in this compound:
Pb3(PO4)2
Pb =
P=
O=

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?

What best discribes the relationship between wavelength and frequency in a electromagnetic wave

Which of the following is a physical property flammability heat of combustion solubility and toxicity