What gas in the air is used by plants to make their own food? (2 points) Nitrogen
Water vapor
Carbon dioxide
Oxygen

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a gas.

What is the percent by mass of magnesium sulfate in mgso4.7h2o