Why is a depletion of the ozone layer harmful?

a) it increases chlorofluorocarbons (cfcs).

b) it allows increased amounts of uv radiation to reach earth’s surface.

c) it increases crop yields.

d)it contaminates ground water.

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

How many atoms or molecules are there in a mole of a substance?