Question 1

The image above shows a water molecule. Which property of water is best explained by the unequal sharing of electrons between oxygen and hydrogen atoms, as indicated by the arrows?

Accepted Answer

Polarity, leading to hydrogen bonding

Question 2

Given the partial charges (δ+ and δ−) shown in the water molecule, what type of bond forms between two water molecules?

Accepted Answer

Hydrogen bond

Question 3

Which statement best describes why water is an excellent solvent for ionic compounds?

Accepted Answer

The polarity of water allows it to surround and dissociate ions.

Question 4

Which of the following best describes the bond between the oxygen and hydrogen atoms within a single water molecule?

Accepted Answer

Polar covalent bond

Question 5

The partial negative charge (δ−) on the oxygen atom in water is a result of which property?

Accepted Answer

Oxygen has a higher electronegativity than hydrogen.

Question 6

Which property of water, resulting from its molecular structure, is most important for the transport of nutrients and waste in living organisms?

Accepted Answer

Excellent solvent properties

Question 7

If a molecule has the structure shown in the image, which of the following best describes its behavior in an electric field?

Accepted Answer

It will align with the field due to its dipole moment.

Question 8

Which of the following equations best represents the dissociation of water?

Accepted Answer

$$2\ \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{H}_3\mathrm{O}^+ + \mathrm{OH}^-$$

Question 9

Which property of water is most directly responsible for its ability to moderate temperature changes in living organisms?

Accepted Answer

High specific heat

Question 10

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds cause water molecules to be more spread out in ice.

Chapter 2: Chemical Principles – Microbiology Study Guide

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