PL HELP 1. Why is water a universal solvent?

A. It covers 75% of the Earth.

B. It easily dissolves polar molecules.

C. It makes up a high percent of most organisms.

D. It coheres and adheres to surfaces.

2. Why is water called the molecule of life?

A. It covers 75% of the Earth.

B. It easily dissolves polar molecules.

C. It makes up a high percent of most organisms.

D. It is a bi-polar phospholipid.

3. Which of the following is true regarding the covalent bonds in a water molecule?

A. They are easy to break.

B. The shared electrons are held closer to the oxygen atom.

C. They occur between the hydrogen atoms.

D. All of these choices are correct.

4. Which of the following is true of hydrogen bonds in water?

A. They are between water molecules.

B. They cause cohesion.

C. They are much easier to break than covalent bonds.

D. All of these choices are correct.

5. Why are drops of water round?

A. Water molecules cohere to each other.

B. The air compresses the water molecules into a drop.

C. Due to its polarity, water molecules surround air creating a bubble.

D. All of these choices are correct.

6. Why is there less variation in temperature along the coast?

A. The ocean absorbs heat when it is hot.

B. The ocean releases heat when it is cold.

C. The ocean maintains a pretty constant temperature, even as it absorbs and releases heat.

D. All of these choices are correct.

7. Why can a barge carry a larger load than a speed boat?

A. Its streamlined shape cuts through the water.

B. It is spread out over more water molecules and supported by surface tension.

C. The bottom of the barge repels water molecules.

D. None of these choices is correct.

8. How does water defy gravity?

A. Water molecules cling to each other causing cohesion.

B. Water molecules tend to adhere to other surfaces.

C. Water molecules are polar, creating hydrogen bonds.

D. All of these choices are correct.