Properties of Water

Why does ice float?

• As water freezes, the molecules move farther apart and its density decreases.

• As water freezes, it takes up more hydrogen from the atmosphere

• As water freezes, air becomes trapped between the water molecules

• As water freezes, it takes up more oxygen from the atmosphere

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Why can water striders walk across the surface of water without falling through?

• They are light enough so they don't break the hydrogen bonds holding the water molecules together

  
  

• The insects actually use their wings to hover slightly above the water’s surface

• The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.

• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

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Which end of the water molecule has a slightly positive charge?

• the oxygen end

• both ends are slightly positive

• the hydrogen end

• neither end is positive

Large bodies of water do not quickly fluctuate in temperature. Why?

• Water is a solvent.

• Water has a high heat capacity.

• Water acts as a buffer.

• Water is non-polar.

Water is a universal solvent because it...

• It can be found anywhere

• It freezes when it gets cold

• floats when frozen

• Dissolves most substances

The fact that ice floats on liquid water is due to the fact that ice is ___________ than it's liquid form.

• less polar

• more polar

• less dense

• more dense

Which statement explains why water molecules stick together?

• both sides are negative

• one side has a positive charge and the other side has a negative charge

• one side has a negative charge and the other side has a neutral charge

• both sides are positive

What property of a water molecule that allows it to stick to other substances.

• adhesion

• cohesion

• specific heat

• universal solvent

What property of water allows one water molecule to stick to other water molecules?

• Adhesion

• Specific Heat Capacity

• Universal Solvent

• Cohesion

Which statement correctly describes how the charges are arranged?

• Oxygen is carries a negative charge, and Hydrogen atoms carries a positive charge.

• Oxygen carries a positive charge, and Hydrogen carries a negative charge.

• All atoms in the water molecule carry a positive charge.

• All atoms in the water molecule carry a negative charge.

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