Unit Test — Cumulative exam Answers

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Which statement describes the electron sea model for metallic bonding?

This model involves electrons held tightly between atoms.

This model explains all properties of metals.

This model involves electrons moving among bands of orbitals.

This model is the simplest model.

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Which statement best explains the change that occurs when gas particles move more slowly?

The temperature increases because the average kinetic energy decreases.

The temperature increases because the average kinetic energy increases.

The temperature decreases because the average kinetic energy decreases.

The temperature decreases because the average kinetic energy increases.

Which statement best describes the light that will cause emission of electrons from a given metal through the photoelectric effect?

light with a low enough intensity

light with a high enough frequency

light with a high enough intensity

light with a low enough frequency

Which is a property of covalent compounds?

They ionize in solution.

They tend to be very hard.

They have a low boiling point.

They have a high melting point.

Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to write out?

a set of quantum numbers for the last electron in the atom

a configuration with numbers, letters, and superscripts

a dot structure of the atom

an orbital notation of the atom

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