4A Review

Which part of a water molecule has a Positive Charge?

• The Hydrogen

• The Oxygen

• The Top

• The Bottom

Which part of a water molecule has a Negative Charge?

• The Hydrogen

• The Oxygen

• The Left

• The Right

Which of the following can water NOT dissolve?

• Salt

• Sugar

• Oil

• Baking Soda

Water is polar. What does that mean?

• it is a molecule with opposite charges on opposite ends

• it is a molecule with no charge

• it is a molecule with identical charges on opposite ends

• it is a molecule with too many protons

Why does ice float?

• water expands when it freezes, making ice less dense than water

• water compacts when it freezes, making ice more dense than water

• hydrogen bonds in water push the ice to the surface

• ice is afraid of water, and avoids it

At what temperature does water Freeze?

• 0^o C

• 100^o C

• 32^o C

• -273^o C

What are the bonds called between a slightly positive hydrogen in a polar molecule and a negatively charged atom?

• Hydrogen Bonds

• Water Bonds

• Covalent Bonds

• Bail Bonds

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

• covalent bonds result in water cohesion (surface tension)

• hydrogen bonds result in water cohesion (surface tension)

• water striders have adapted to take advantage of water cohesion

• water striders are afraid of water and avoid it

At what temperature does water Boil?

• 0^o C

• 100^o C

• 32^o C

• 212^o C

What type of bond is found BETWEEN water molecules?

• hydrogen bonds

• ionic bonds

• nonpolar covalent bonds

• polar covalent bonds