Chem B Week 1 Unit 1a

Why does water appear blue?

• Because the sky is reflecting on the water.

• Because of the way the water molecules are moving.

• Because of blue-colored elements dissolved in the water.

What is different about the molecules of water at different temperatures?

• The type of molecules.

• The total number of molecules.

• The speed of molecules.

• The type of atoms in the molecules.

Temperature is the average ___ energy of the molecules in a substance.

Vibrations occur in the bonds between atoms.

• True

• False

____ describes the speed waves vibrate.

• Frequency

• Wavelength

• Amplitude

• Density

In water, the bonds between each oxygen and hydrogen atom vibrate at just the right frequency to absorb all colors of light except ___.

What are 3 phases of matter on Earth?

1 atm is the measure of air ___ at sea level.

• gravity

• density

• pressure

• force

The higher you go up a mountain, what happens to the boiling point of water?

• As pressure decreases, boiling point also decreases

• As pressure decreases, boiling point increases

• As pressure increases, boiling point decreases

• As pressure increases, boiling point increases

The presence of which type of intermolecular forces in a liquid will lead to the highest boiling point?

• Van der Waals forces

• Dipole-dipole forces

• Hydrogen bonding