Calculate the mass of potassium in 500g of potassium sulfate?

Two like-charged particles are placed close to each other. how would the force of repulsion be affected if the charge on one of the particles is doubled and that on the other is reduced to half the original value?

The form of energy that can move from place to place across the universe is (answer) on earth, the main source of this energy is (2nd answer) first blank; a) gravitational potential energy b) radiant energy c)thermal energy d) vibrational energy second blank; a)lightning b) the moon c) the sun d) the wind

Rank the compounds below from slowest to fastest rate of hydration. 1) formaldehyde 2) 3,3-dimethyibutan-2-one 3) propanal 4)3-methylbutan-2-one 5) butan-2-one