Hydrogen has one proton and one electron. it is in column 1 on the periodic table. how many valence electrons does hydrogen have? 0 1 2 3

The electromagnetic force acts between what

Matches the chemical name of each oxide of phosphorus to its chemical formula

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?