select the particle or particles that account for more than 99.99% of the mass of atoms other than hydrogen

What mass of naturally occurring uranium is closer to 238 u, 235 u or 234 u?

How does Newton's law of universal gravitation apply to Earth and the moon?

Write equations that show the dissociation of the following compounds in water. Include states in your answer. Fecl3 potassium phosphate

A balloon has a volume of 2.5 L and contains 0.100 moles of Helium. Another balloon has a volume of 5.0 L. They are at the same temperature and pressure. How many moles of gas does the second balloon contain?

In a closed system, If a gas is transported to a container with double the volume of the previous container, the gas was held in, what is the gases' new volume ?

List two things you know about nonrenewable energy

Does a mole of hydrogen have the same mass as a mole of oxygen? explain your answer.

A 0.500-L sample of H₂SO₄ solution was analyzed by taking a 100.0mL aliquot and adding mL of. After the reaction occurred, an excess of ions remained in the solution. The excess base required mL of for neutralization.

Ammonia can be prepared by the reaction of magnesium nitride with water. The products are ammonia and magnesium hydroxide. Write and balance the equation.

Which period is the shortest in the long form of the periodic table? Name all the elements in this period.