Bioportal Ch. 2 Study Guide
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 Form Molecules? Points Earned: 1/1
Correct Answer: A
Your Response: A
3. The pH of coffee is close to 5 and that of pure water is 7. This means that A. coffee is more basic than water.
B. water is more acidic than coffee.
C. the H+ concentration of coffee is seven-fifths that of water.
D. the H+ concentration of water is one-one hundredth that of coffee.
E. the H+ concentration of water is one-hundred times that of coffee.
Correct
See Section 2.4: What Makes Water So Important for Life? Points Earned: 1/1
Correct Answer: D
Your Response: D
4. Which of the following statements best describes the difference between an element and a molecule? A. An element is composed of atoms; a molecule is not.
B. An element is composed of only one kind of atom; molecules can be composed of more than one kind of atom.
C. An element is unstable; molecules are stable.
D. Elements always have lower atomic weights than molecules.
E. Elements exist in nature only as parts of molecules.
Correct
See Section 2.1: How Does Atomic Structure Explain the Properties of Matter? Points Earned: 1/1
Correct Answer: B
Your Response: B
5. Solid salt, NaCl, is neutral. When dissolved in water, NaCl A. remains as NaCl (does not
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 Form Molecules? Points Earned: 1/1
Correct Answer: A
Your Response: A
3. The pH of coffee is close to 5 and that of pure water is 7. This means that A. coffee is more basic than water.
B. water is more acidic than coffee.
C. the H+ concentration of coffee is seven-fifths that of water.
D. the H+ concentration of water is one-one hundredth that of coffee.
E. the H+ concentration of water is one-hundred times that of coffee.
Correct
See Section 2.4: What Makes Water So Important for Life? Points Earned: 1/1
Correct Answer: D
Your Response: D
4. Which of the following statements best describes the difference between an element and a molecule? A. An element is composed of atoms; a molecule is not.
B. An element is composed of only one kind of atom; molecules can be composed of more than one kind of atom.
C. An element is unstable; molecules are stable.
D. Elements always have lower atomic weights than molecules.
E. Elements exist in nature only as parts of molecules.
Correct
See Section 2.1: How Does Atomic Structure Explain the Properties of Matter? Points Earned: 1/1
Correct Answer: B
Your Response: B
5. Solid salt, NaCl, is neutral. When dissolved in water, NaCl A. remains as NaCl (does not