Bio Exam

1. What is the chemical formula for water?

• CO2

• H2O

• O2

• H2CO3

2. Water is a ______ molecule.

• nonpolar

• polar

• ionic

• nonessential

10. In the scientific method, what should scientists do if their hypothesis is not supported by the data?

• Ignore the data and continue with the same hypothesis

• Modify the hypothesis and repeat the experiment

• Abandon the scientific method and start over

3. In a water molecule, what is the charge on the

• slight negative

• slight positive

• neutral

• both positive and negative

4. What is the term used to describe the tendency of water molecules to stick to each other due to
hydrogen bonding?

• adhesion

• solubility

• cohesion

• photosynthesis

5. Which of the following best explains why water molecules stick to the inside of a glass surface?

• adhesion

• solubility

• cohesion

• surface tension

6. Which of the following best explains why insects like water striders can walk on the surface of water
without sinking?

• adhesion

• solubility

• specific heat

• surface tension

7. Which substance typically takes longer to heat up when exposed to the same amount of heat energy?

• Metal

• Water

• Both heat up at the same rate

• Neither heat up

8. Why is ice less dense than water?

• Ice molecules have more kinetic energy than water molecules.

• Ice molecules form a hexagonal honeycomb structure with open spaces.

• Ice molecules have stronger hydrogen bonds compared to water.

• None of the above

9. Which of the following statements is true regarding a solution in biology?

• The solute dissolves in the solvent.

• The solvent is always a solid substance.

• The solute is always present in larger quantities than the solvent.

• The solvent dissolves in the solute