Bio Formative Q 1 - SC.912.L.18.12

Multiple Choice

Identify the choice that best completes the statement or answers the question. Do not write on this test.

1.Water molecules have the ability to dissolve many solutes associated with cells. Of the following choices, which property allows water to dissolve solutes?

a. / polarity / c. / high heat capacity
b. / non-polarity / d. / cohesive properties

2.Water is essential for life. Its special properties make water the single most important molecule in plant life. Which of the following properties of water enable it to move from the roots to the leaves of plants?

a. / Water expands as it freezes. / c. / Water exhibits cohesive behavior.
b. / Water is an excellent solvent. / d. / Water is able to moderate temperature.

3.Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?

a. / Water is an acid. / c. / Water acts as a buffer.
b. / Water is a versatile solvent. / d. / Water has a high heat capacity.

4.Water makes up approximately 60% of the human body and plays a vital role in regulating body temperature. Which property of water makes it good at regulating temperature?

a. / Water is a good solvent. / c. / Water has a high capacity for heat.
b. / Water exhibits strong cohesion. / d. / Water has an unusual crystalline structure.

5.You place a bottle of water in the freezer. The next morning, you open the freezer and find that the bottle has burst. Which property of water explains what happened?

a. / Water molecules are polar. / c. / Water is a universal solvent.
b. / Water molecules are cohesive. / d. / Water molecules expand upon freezing.

6.Most solids will sink if placed in a liquid, however, ice reacts differently by floating in liquid

water. Which property of water explains this occurrence?

a. / A lower pH makes the water more acidic, resulting in the neutral ice floating. / c. / The cohesion of the water keeps the particle close together, therefore, increasing the density of the icy state of the water.
b. / The hydrogen bonds of water expand during the freezing process, creating more volume and decreasing density of the ice. / d. / The covalent bonds, between the water atoms, break expanding the ice molecules so that liquid water can fill the spaces in between the water molecules.

7.Insects called “skate bugs” can actually “walk” on the surface of water in a pond or lake. What property of water enables the bug to be able to float?

a. / The high specific heat capacity of water allows this. / c. / The hydrogen bonds in water clings to the legs of the bugs and keeps them afloat.
b. / pH of the water must be very low, allowing the surface of water to be calm. / d. / Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay afloat.

Short Answer

8.Draw two water molecules. Show their polarity and hydrogen bonding.

9.Examine the image of the water molecules, above. Considering the charges on each of the molecules, explain why or how they interact with each other.

Bio Formative Q 1 - SC.912.L.18.12

Answer Section

MULTIPLE CHOICE

1.ANS:ASTA:SC.912.L.18.12TOP:polarity

2.ANS:CSTA:SC.912.L.18.12TOP:Cohesive

3.ANS:DSTA:SC.912.L.18.12TOP:Specific Heat

4.ANS:CSTA:SC.912.L.18.12TOP:Specific Heat

5.ANS:DSTA:SC>912.L.18.12TOP:Water expands

6.ANS:BSTA:SC>912.L.18.12TOP:Hydrogen bonds- water expands

7.ANS:DSTA:SC.912.L.18.12TOP:Cohesive property

SHORT ANSWER

8.ANS:

Draw two molecules and show polarity/bonding.

9.ANS:

Polarity, hydrogen bonding.