12.1 Water

Multiple Choice

How many hydrogen atoms are in one water molecule?

• 1

• 2

• 3

• 4

Multiple Choice

Which is more electronegative?

• hydrogen

• oxygen

Multiple Choice

What kind of charge is on hydrogen atoms?

• positive

• negative

• north

• south

Multiple Choice

The water molecules are arranged

• by size

• with opposites away from each other

• with opposites next to each other

• randomly

Multiple Choice

Classify the following molecule.

• polar

• nonpolar

Multiple Choice

Classify the following molecule.

• polar

• nonpolar

Multiple Choice

Polar molecules

• have even charge density

• are symmetric

• form hydrogen bonds

• have 10 atoms per molecule

Multiple Choice

How do covalent bonds form?

• Donating & receiving valence e- between atoms.

• Opposite slight charges attract each other between compounds.

• Scientists are still not sure how they form.

• Sharing valence e- between nonmetal atoms.

Multiple Choice

Water beads up on the surface of a penny because of this property.

• Adhesion

• High Surface Tension

• Universal Solvent

• Changes in Density

Multiple Choice

What is a surfactant?

• A molecule that does not adsorb at surfaces

• A substance that prevent bubble formation

• A molecule that reduces surface tension of a liquid

• A substance that is always water soluble

Multiple Choice

Printers often use surfactants in the

printing of paper with ink. Why this might be?

• Reducing the surface tension of the liquid ink would allow

  it to wet the paper better, making the transfer of ink more

  complete.

• Increasing the surface tension of the liquid ink would allow

  it to wet the paper better, making the transfer of ink more

  complete.

• Reducing the surface tension of the liquid ink would allow

  it to remain balled up, making the transfer of ink more

  complete.

Multiple Choice

When a liquid reaches the temperatures of its ___, it can become a gas.

• melting point

• freezing point

• boiling point

• density

Multiple Choice

The weaker the intermolecular forces of a substance the _____________ the boiling point

• higher

• lower

Multiple Choice

Hydrogen fluoride (HF) has a lower

boiling point than water (H2O), even though fluoride (F) has a greater

electronegativity than oxygen (O). Why do you think that is?

• Hydrogen fluoride has two hydrogen involved in hydrogen

  bonding, while water has two.

• Hydrogen fluoride has only one hydrogen involved in hydrogen

  bonding, while water has two.

• Hydrogen fluoride has no hydrogen involved in hydrogen

  bonding, while water has two.

• Hydrogen fluoride has three hydrogen involved in hydrogen

  bonding, while water has two.

Multiple Choice

Why do ice cubes float in a  glass of water?

• the ice cubes are more dense than the water

• the liquid water is more dense than the solid ice cubes

• the water is more dense than the glass

• the ice is more dense than the glass

Multiple Choice

What is the formula for density?

• density = mass x volume

• density = mass / volume

• density = mass + volume

• density = mass - volume

Multiple Choice

The universal solvent is ______. 

• sodium 

• acid 

• water 

• wind 

Multiple Choice

The _____is the part that gets dissolved. 

• solute 

• solvent 

• solution 

• Sacajawea 

Multiple Choice

When one of the parts of the solution is water we call it _________. 

• water stuff 

• water mixture 

• aqua-man

• aqueous 

Multiple Choice

This is the part of the solution that causes the dissolving to occur.

• solute

• solvent

• salt water

• the saturant

Multiple Choice

What is it about the water molecule that makes it a great solvent?

• water demonstrates polarity; a partial charge on each side of the molecule

• due to its molecular formula

• it has a liner molecular shape

• due to it's non-polar molecular structure

Multiple Choice

____________ is the process whereby particles of a solvent completely surround the particles of a solute, disperse them throughout the solvent particles, and hold them in solution.

• solvation

• immisciblation

• dissolution

• saturation

Multiple Choice

What is the reason why oil and water don't mix?

• Oil is too heavy to mix with water

• Water can only mix with polar molecules 

• Water can only mix with non-polar molecules

• Oil is too light to mix with water 

Multiple Choice

Will MgSO4 (polar) dissolve in water?

• Yes

• No

Multiple Choice

Will C2H2 (nonpolar) dissolve in water?

• Yes

• No

Multiple Choice

A solid substance was tested in the laboratory. The test results are listed below.

• dissolves in water

• is an electrolyte

• melts at a high temperature

Based on these results, the solid substance could be

• Cu

• CuBr_{2 (polar)}

• C

• C₆H₁₂O_{6 (nonpolar)}

Multiple Choice

A substance that conducts an electrical current when dissolved in water is called

• catalyst

• metalloid

• electrolyte

• nonelectrolyte

Multiple Choice

What happens when BaF_2(s) is dissolved in water?

• F^- ions are attracted to the oxygen atoms of the water

• F^- ions are attracted to the hydrogen atoms of the water

• Ba²⁺ ions are attracted to the hydrogen atoms of the water

• No attractions are involved, the crystal just falls apart

Multiple Choice

A compound is a hydrate when it...

• is composed of only hydrogen and oxygen
• is a state of water
• contains water in the compound

• repels water from the compound