If the Universe is now expanding, why must it once have been a point?

Draw the lewis dot structure for each of the following polyatomic ions

The biosphere of the earth is made up of what compound? organic or inorganic?

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.