If a substance has a half life of 45 days, how much of the original substance would be left after 90 days?

Just as earth moves around the sun, the moon revoles around the earth. About how many earth days does it take for the moon to travel around the earth?

What will happen to the particles of a gas if the gas is transferred from a small container to a much larger container

I have 2 questions: Sulfur has an atomic number of 16 and belongs in Group 6 on the periodic table. Calcium has an atomic number of 20 and belongs in Group 2 on the periodic table.

After reaching equilibrium, the rate of formation of products is less than the rate of formation of reactants. After reaching equilibrium, the rate of forming products and reactants is the same. Equilibrium is obtained prior to Te.

The decomposition of nitramide, O 2 NNH 2, O2NNH2, in water has the chemical equation and rate law O 2 NNH 2 (aq) ⟶ N 2 O (g) + H 2 O (l) rate = k [ O 2 NNH 2 ] [ H + ] O2NNH2 (aq) ⟶N2O (g) + H2O (l) rate=

How many atoms are in this formula? 4 O2 A 2 B 4 C 6 D 8

How many O2 moles are needed to react with 12.5 mol of SO2

What is nitrogen classified as

Give 2 examples of how rocks color provides rocks mineral composition

A fluorescent light tube usually contains A. a vacuum. B. oxygen. C. mercury vapor. D. light-emitting diodes.