Is BaSO3 a poly atomic covalent

What material does not melt at any temperature

How have the greenhouse gasses increased from the year 2000 to 2018

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?