Properties of Water

Which is NOT a unique property of water?

• Frozen water floats on liquid water.
• Water covers most of the Earth’s surface and retains a large amount of heat.
• Water molecules stick to each other through hydrogen bonds.
• Water cools very rapidly.

What property of water helps to moderate earth's temperature?

• adhesion
• chohesion
• Specific heat capacity
• Latent heat of vaporization

What word describes when a molecule is attracted to water?

• hydrophobic
• hydrophilic
• bipolar
• solvent

When you mix salad oil and water they immediately separate because:

• Salad oil is hydrophobic
• Hydrogen bonds reform between water molecules
• Salad oil is too heavy
• It depends on what kind of oil you are using

Why does ice float?

• As water freezes, hydrogen bonds stabilize and keep the molecules of ice farther apart.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Water is polar because...

• The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
• The molecule has two poles, at which the it is colder than other regions of the molecule.
• The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.
• The water molecule is neutral.

Why does water move from the roots to the leaves of plants?

• Water is pushed by solutes
• Capillary action pulls the water molecules like a chain
• Water is pulled by gravity
• Gravity causes it to “pull” towards the leaves

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

Attractions between water molecules are due to ..

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

Pure, freshly-distilled water has a pH of 7.  This means ...

• The concentration of H+ ions in the water equals the concentration of OH- ions in the water.
• The concentration of H+ ions is 7 times the concentration of OH- ions in the water.
• The concentration of OH- ions in the water is 7 times the concentration of H+ ions in the water.