Aball is thrown in the air. the ball goes up, then changes direction and falls down. why does the ball fall down? gravity pushes the earth up. gravity makes the ball lighter. gravity stops working. gravity pulls it down.

Calculate the number of molecules present in 0.750 mol of mgo.

Will give ! what are the advantages and disadvantages of nuclear power? check all that apply. one advantage of nuclear energy is that it does not produce carbon dioxide emissions. storage of nuclear waste is a short-term problem associated with nuclear energy. the problem with uranium mining is that a large quantity of uranium must be extracted to meet energy needs because the energy release from uranium fission is so low. safe operation of a nuclear power plant can be jeopardized by a human mistake.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.