An average sample of coal contains 3.0% sulfur by mass. calculate the moles of sulfur present in 2.40 ' 103 kg of coal.

Question 5 why does grinding solid crystals increase the rate of dissolving for a solid solute in water? smaller crystals are more polar. smaller crystals are more nonpolar. smaller crystals have more energy. smaller crystals have more surface area.

The volume of an air bubble at the bottom of a lake is 1.35 mL. If the pressure at the bottom of the lake is 125 kPa and the air pressure at the top of the lake is 105 kPa, what will the volume of the bubble be when it rises to the surface?

Hydroelectric energy comes from

Lead has a density of 11.3 grams/cm cubed. What mass of lead will fit in a 20 cm cubed container?

How might we create the best possible solution to a problem?

Which of the following radioactive emissions is the least penetrating, aloha particles, beta particles or gamma rays

The three major groups p On the periodic table are the

Which of the following has the greatest mass, in grams? a. 1 atom of lead (Pb) b. 0.5 mol copper (Cu) atoms c. 0.3 mol gold (Au) atoms d. 25 atoms of mercury (Hg)

Which one is not a sedimentery rock a.) sandstone b.) limestone c.) quartz d. (coal

Which group is more reactive than the alkaline earth metals?