Discussion
Home ‣ Biochemistry ‣ Water, pH and Macromolecules Comments
- Question
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
- Correct Answer
- All of the above
- 1. 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
- 2. 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 Discuss
- 3. 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
- 4. H2O and CH4 are both examples of
Options- A. molecules
- B. ions
- C. acids
- D. none of these Discuss
- 5. Which of the following alcohols would be most soluble in water?
Options- A. methanol
- B. ethanol
- C. butanol
- D. octanol Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Which of the following character does not apply to water?
Options- A. The water molecule is asymmetric
- B. The water molecule readily forms hydrophobic interactions
- C. The covalent bonds in water are highly polarized
- D. All three atoms in the water molecule readily form hydrogen bonds Discuss
- 10. A Bronsted acid becomes __________ upon losing a proton.
Options- A. highly reactive
- B. its conjugate acid
- C. its conjugate base
- D. a hydronium ion Discuss
Water, pH and Macromolecules problems
Search Results
Correct Answer: surround the ions because of their charge but do not form hydrogen bonds
Correct Answer: 1 x 10-7
Correct Answer: 100 times more acidic
Correct Answer: molecules
Correct Answer: methanol
Correct Answer: electronegativity
Correct Answer: at pH values around any of their pKa's
Correct Answer: are the reactions of the functional groups
Correct Answer: The water molecule readily forms hydrophobic interactions
Correct Answer: its conjugate base
Comments
There are no comments.More in Biochemistry:
Programming
Copyright ©CuriousTab. All rights reserved.