Water Chemistry

In order for evaporation to occur, liquid water must change state into a ___________.

• gas

• solid

• plasma

Tags

NGSS.MS-PS1-4

NGSS.MS-ESS2-4

A water molecule is held together by this type of bond

• Ionic

• Non polar covalent

• Hydrogen

• Polar covalent

Why can water have no net charge but have slight charges in different parts of the molecule?

• The oxygen end is slightly negative and the hydrogen end is slightly positive

• The hydrogen end is slightly negative and the oxygen end is slightly positive

• The hydrogen and oxygen ends change in polarity

• Because it is hydrophobic

Water is a universal solvent because it...

• It can be found anywhere

• It freezes when it gets cold

• floats when frozen

• Dissolves most substances

Pure water has a

• Neutral pH 

• Negative pH

• Positive pH

• Both Negative and Positive pH

As liquid water becomes ice, the space between water molecules increases.

Which property of water does this change describe?

• Water has a high boiling point

• Water has a high specific heat capacity.

• Water molecules have adhesive properties.

• Water is less dense as a solid than a liquid.

Water has a boiling point of 100.0∘C, which is unusually high compared to many other liquids.

Which of the following properties allows water to have a high boiling point?

• It contains only three atoms.

• It is a small, covalent molecule.

• It contains oxygen.

• It can form hydrogen bonds.

Tags

NGSS.MS-PS1-4

A water strider can skate along the top of a pond because:

• covalent bonds result in water cohesion

• hydrogen bonds result in water cohesion (surface tension)

• water striders have adapted to take advantage of water cohesion

• low surface tension of water

Which of the following is LEAST likely to dissolve in water?

• nonpolar fats and oils

• polar sugar molecules

• salt made of a positive sodium ion and a negative chloride ion

• all of the substances will dissolve easily in water

The property of water molecules being attracted to other water molecules is called _________.