5witch of these is a covalent compound? no2 b licl c aici3 d na2s

What does x represent in the formula for the compound xcl4?

Which best describes how johannes kepler developed his laws of planetary motion

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?