When preparing a pure and dry sample of ammonium chloride, we cannot dry the sample of ammonium chloride by evaporating it to dryness. Explain why this is so.

Which of these will change if the air in aclosed bottle is heated? abcdthe mass of the airthe composition of the airthe air pressure in the bottlethe number of air molecules in the bottle

What layer of the atmosphere is directly above the troposphere?

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball