20 + points the law of conservation of mass states that matter can neither be nor in a chemical reaction.

The law of conservation of mass states that matter cannot be CREATED nor DESTROYED in a chemical reaction.

it is important to conserve water because there is very limited amount of freshwater here on earth and if we are not smart about how we use it we will only be runnning out of our supply faster than neccessarry.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.