Answer:
answer is in the link because it says my answer contains inappropriate words
Explanation:
Yes: water can exist in solid (ice), liquid (water), and gas (water vapor) forms.
“If a glass of full water is placed by a window and 3 hours go by, then the water in the cup will be lower because the water will evaporate.”
Because of the characteristic of catalyst. The catalyst is used to accelerate the reaction rate and will not participate the reaction itself. The catalyst can not be changed or consumed during the reaction. So it does not need to be replaced.
