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Einstein proposed that electrons on the surface of a metal gradually absorb energy from photons until they have enough energy to leave the surface.

Two students stand poised to leap off a high dive structure into a swimming pool below. Pat is twice as massive as Chris. Which of the following is true?

How many molecules are in an 8.0-g sample of oxygen gas, ?

The rule “like dissolves like” explains why liquids are generally soluble in other liquids.

The maximum number of valence electrons is eight.

A candle with a certain weight melts in an oven; compared to the weight of the solid wax, the weight of the melted wax is

Heisenberg’s uncertainty principle says that you cannot know the momentum or the position of an electron exactly.

The density of a 100-g piece of iron is twice as great as the density of a 50-g piece of iron.

Ionic bonds involve the transfer of electrons from one atom to another.

The subscript “2” in Mg(OH) tells you that the charge of the hydroxide ion is (-2).