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An electron moves from one orbital to another only when it absorbs or emits energy.

The transfer of heat that occurs when energy moves from molecule to molecule by direct contact is called

Gasoline made primarily of straight-chain hydrocarbons has a low octane rating.

Atoms from an element in group VA are allowed to react with atoms from an element in group VIIIA. What type of compound is likely to form?

Which type of chemical bond is formed between two atoms by the sharing of two electrons, with one electron from each atom?

What is the formula weight of methane, C?

When you are moving toward a stationary source of a sound, its frequency will seem to be lower than it actually is.

Which of the following is NOT a SI unit of the property it measures?

When monochromatic light passes through two slits and arrives at a point on a screen out of phase,

Most elements are