Water Properties

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

• the oxygen end

• the hydrogen end

• both ends are slightly positive

• neither end is positive

Water is a universal solvent because it...

• It can be found anywhere

• It freezes when it gets cold

• floats when frozen

• Dissolves most substances

Because of the unique properties of water associated with hydrogen bonding, water evaporates from pores on the leaves of plants and draws water molecules in a continuous chain from the roots up through the vascular tissues of plants. Which of these groups of terms describes the process and the properties of water that explain this?

• adhesion, cohesion, and translocation

• adhesion, cohesion, and transcription

• cohesion, adhesion, and transpiration

• cohesion, hybridization, and transpiration

Which of the following does not result from hydrogen bonding in water molecules?

• Cohesion

• Adhesion

• Surface Tension

• Dissolving fats

Why is water considered polar?

• Nonpolar covalent bonds in structure

• Ionic bonds in structure

• Polar covalent bonds in structure

• Hydrophobic interaction in structure

Which of the following describes why lipids are hydrophobic?

• Lipids are composed mostly of hydrocarbons which are nonpolar

• Lipids have hydrogen bonds that repel the hydrogen bonds in water

• Lipids have more neutrons in their atoms, making the compound neutral

• Lipids are gaseous materials that do not dissolve in water

Some insects can stand on 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
  

If the intracellular concentration is 1.0 M and extracellular concentration is 0.4M. Which direction does water flow?

• Both in and out (equilibrium)

• Into the cell

• Out of the cell

In a turgid plant cell, which describes pressure potential of cell water

• Negative

• Positive

What property of water allows it to dissolve many substances?

• Cohesion

• Adhesion

• Polarity

• Viscosity