Special Properties of Water

1.     Which of the following statements correctly explains why ice stays at the top of oceans instead of sinking to the bottom?

• Ice is colder than liquid water

• Ice is less dense than liquid water

• Ice is more dense than liquid water

• Ice is warmer than liquid water

1.     Which of these statements correctly explains why water is a good solvent for many ionic compounds?

• Water is a polar molecule

• Water is an ionic molecule

• Water molecules are nonpolar

• Water molecules ionize to H⁺ and OH^-

A florist places a bouquet of white carnations in water containing blue dye.  After a time, the flowers turn blue.  What process helped the carnations change color?

• Water's ability to form crystals

• Ability of H₂O to dissolve NaCl

• Cohesion and adhesion of water molecules

• Formation of hydrogen bond between hydrogen and oxygen molecules

Which property of water makes it an excellent solvent?

• It has a high heat capacity

• It has a low freezing point

• It is polar and forms hydrogen bonds

• Ice is less dense as a solid than as a liquid

Water has an uneven, or asymmetrical, distribution of electron density.  A diagram of a water molecule is shown on the right. What is the reason for this uneven distribution of electrons?

• Oxygen is larger than hydrogen

• Oxygen has a higher electronegativity than hydrogen

• Oxygen loses 1 electron to each hydrogen

• Oxygen is more abundant than hydrogen

Tags

NGSS.HS-PS1-2

1.     A strong interaction between a partially positive hydrogen atom of one water molecule and the partially negative oxygen atom of another water molecule allows water to be cohesive and have a high surface tension. What type of bond is this known as?

• Carbon

• ionic

• hydrogen

• oxygen

What forms the basis for nearly all fluids in living tissue because of which of its properties?

• The relationship between water's temperature and volume

• the absence of liquid water on most plants

• the versatility of water as a solvent

• The ability of water to change phase

Tags

NGSS.MS-LS1-2

Water has a much higher specific heat than most other covalent compounds.  What do you predict might happen if water had a low specific heat instead?

• Flooding would occur and animals would be forced to migrate

• Harmful organisms living in the water would reproduce at a rapid rate

• Organisms that are sensitive to changes in temperature would die

• Plants would not have enough water to effectively carry out photosynthesis

Which of the following is NOT a unique property of water?

• Water molecules stick together by cohesion

• Frozen water is less dense than liquid water

• Water molecules stick to other polar substances

• Hydrogen bonds allow water to heat and cool very quickly

Many fish and aquatic plants can survive a cold winter because the layer of ice that forms on top of the lake insulates the water below and prevents the lake from freezing solid. What unique property of water contributes to this effect?

• Water absorbs heat when it evaporates and forms a gas

• Water expands and becomes less dense when it freezes

• Water molecules completely separate into ions in solution

• Water forms hydrogen bonds with ions and other polar substance

Tags

NGSS.HS-ESS2-5