Discussion
Home ‣ Biochemistry ‣ Water, pH and Macromolecules Comments
- Question
What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?
Options- A. 7
- B. 7 x 10-7
- C. 5 x 10-7
- D. 1 x 10-7
- Correct Answer
- 1 x 10-7
- 1. A solution with pH = 5 is __________ than a solution with pH = 7.
Options- A. 2 times more basic
- B. 10 times more basic
- C. 10 times more acidic
- D. 100 times more acidic Discuss
- 2. H2O and CH4 are both examples of
Options- A. molecules
- B. ions
- C. acids
- D. none of these Discuss
- 3. Which of the following alcohols would be most soluble in water?
Options- A. methanol
- B. ethanol
- C. butanol
- D. octanol Discuss
- 4. Buffer solutions
Options- A. will always have a pH of 7
- B. are rarely found in living systems
- C. cause a decrease in pH when acids are added to them.
- D. tend to maintain a relatively constant pH. Discuss
- 5. The reason that fats contain more energy than simple sugars, is fats have many more
Options- A. carbon atoms
- B. hydrogen atoms
- C. covalent bonds
- D. hydrogen bonds Discuss
- 6. Salt dissolves well in water as water molecules
Options- A. form hydrogen bonds with the positively and negatively charged ions
- B. make nonpolar covalent bonds with the positively charged ions only
- C. surround the ions because of their charge but do not form hydrogen bonds
- D. share electrons with the ions to make polar covalent bonds Discuss
- 7. Which of the following statements about water is correct?
Options- A. It is critical for many of the chemical processes found in living systems
- B. Polar substances that can form hydrogen bonds will dissolve in it
- C. Nonpolar substances like oils are not soluble in it
- D. All of the above Discuss
- 8. The strength of an acid depends on
Options- A. number of neutrons gain
- B. electronegativity
- C. number of double bonds
- D. number of protons released Discuss
- 9. Polyprotic acids such as H3PO4, can act as acid-base buffers
Options- A. only in combination with polyprotic bases
- B. if their concentration is kept low
- C. at pH values around neutrality
- D. at pH values around any of their pKa's Discuss
- 10. The reactions of molecules
Options- A. are the reactions of the functional groups
- B. are independent of the functional groups
- C. require an enzyme in all cases
- D. all of the above Discuss
Water, pH and Macromolecules problems
Search Results
Correct Answer: 100 times more acidic
Correct Answer: molecules
Correct Answer: methanol
Correct Answer: tend to maintain a relatively constant pH.
Correct Answer: covalent bonds
Correct Answer: surround the ions because of their charge but do not form hydrogen bonds
Correct Answer: All of the above
Correct Answer: electronegativity
Correct Answer: at pH values around any of their pKa's
Correct Answer: are the reactions of the functional groups
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