What results when water is chemically decomposed?

Fish don't live very long in water that has been boiled and brought back to room temperature. Provide an explanation for this fact.

When a container of gas is heated, would you expect its molecules to speed up, slow down, or be unaffected?

Gas A is composed of diatomic molecules (two atoms to a molecule) of a pure element. Gas B is composed of monatomic molecules (one atom to a "molecule") of another pure element. Gas A has three times the mass of an equal volume of gas B at the same temperature and pressure. How do the atomic masses of elements $A$ and $B$ compare?

According to Richard Feynman when do atoms attract each other, and when do they repel?

To become a positive ion does an atom lose or gain an electron?

To become a negative ion, does an atom lose or gain an electron?

What is the evidence that dark matter exists?

How does an ion vary from an atom?

What occurs when a particle of matter and a particle of antimatter meet?

What element results if two protons and two neutrons are ejected from a radium nucleus?

How do matter and antimatter differ?

What element results if you add a pair of protons to the nucleus of mercury?

Compared with the energy it takes to separate oxygen and hydrogen from water, how much energy is released when they recombine?