2.2 IB Water

Capillary action is the result of adhesion. Which aspect of water is responsible for this?

• Nonpolar covalent bonds that enable water to dissolve other substances
  
• Polar covalent bonds that join molecules of water to other substances
• Hydrogen bonds between water and another substance
• Ionic bonds that enable electrons to flow through water and into another substance

Which of the following properties of water enables it to move from the roots to the leaves of plants?

• Water expands as it freezes.

• Water is an excellent solvent.

• Water exhibits cohesive and adhesive behavior.

• Water moderates temperature.

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What property of water allows it to be such a versatile solvent that it is often called the "universal solvent?"

• Purity
• Polarity and cohesion
• High heat capacity
• Expansion upon freezing

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.

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Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

• The insects are light enough so they do not break the hydrogen bonds holding the water molecules together

• The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.

• 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 two elements make up water?

• Helium and oxygen

• Hydrogen and oxygen

• helium and carbon

• oxygen and carbon

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What word describes when water is attracted to other substances?

• cohesion
• adhesion
• capillary action
• surface tension

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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 - it's polar

• The hydrogen end is slightly negative and the oxygen end is slightly positive - it's polar

• The hydrogen and oxygen ends change in polarity - it's polar

• Because it is hydrophobic

How 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

• Water’s cohesion causes it to “pull” towards the leaves

Attractions between different water molecules is called ....

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds

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