Bioportal Ch. 2 Study Guide Essay

1417 Words Jan 18th, 2012 6 Pages
1. Polar molecules A. have bonds with an unequal distribution of electric charge.
B. must form ions in water solution.
C. have bonds with an equal distribution of electrical charge.
D. have bonds with an overall negative charge.
E. have bonds with an overall positive charge.

Correct
See Section 2.2: How Do Atoms Bond to Form Molecules? Points Earned: 1/1
Correct Answer: A
Your Response: A
2. Hydrocarbons are _______ and _______, whereas salts are _______ and _______. A. nonpolar; hydrophobic; polar; hydrophilic
B. nonpolar; hydrophilic; polar; hydrophobic
C. polar; hydrophilic; nonpolar; hydrophobic
D. polar; hydrophobic; nonpolar ; hydrophilic
E. None of the above

Correct
See Section 2.2: How Do Atoms Bond to
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C. Frozen water is more dense than liquid water.
D. Frozen water is less dense than liquid water.
E. Water forms hydrogen bonds.

Correct
See Section 2.4: What Makes Water So Important for Life? Points Earned: 1/1
Correct Answer: D
Your Response: D
11. Water is essential to life. Which of the following physical properties of water affect(s) life in some beneficial way? A. Cohesiveness
B. High heat capacity
C. High heat of vaporization
D. Ice is less dense than liquid water
E. All of the above

Correct
See Section 2.4: What Makes Water So Important for Life? Points Earned: 1/1
Correct Answer: E
Your Response: E
12. Which of the following interactions between atoms is the strongest? A. Hydrophobic
B. Ionic
C. Covalent
D. van der Waals
E. Hydrogen bonds

Correct
See Section 2.2: How Do Atoms Bond to Form Molecules? Points Earned: 1/1
Correct Answer: C
Your Response: C
13. Given that Avagadro's number is 6.02 × 1023, how many molecules of KCl would there be in 10–13 liter of a 1 M KCl solution? A. 6.02 × 1036
B. 6.02 × 1010
C. 6.02 × 10–10
D. 6.02 × 103
E. 6.02 × 1013

Correct
See Section 2.4: What Makes Water So Important for Life? Points Earned: 1/1
Correct Answer: B
Your Response: B
14. For a covalent bond to be polar, the two atoms that form the bond must have A. differing atomic weights.
B. differing numbers of neutrons.
C. differing melting points.
D. differing electronegativities.

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