Multiple Choice
The optimal pH for enzymes in the small intestine, such as trypsin, is typically around 7.5 to 8.5. Is the pH of Claire's small intestine below, within, or above the optimal range for these enzymes?
6
views
3. Water
pH Scale
Back3. Water
pH Scale
- Multiple ChoiceWhy does damage to the lower respiratory system affect the body's pH balance?23views
- Multiple ChoiceBy picking up hydrogen ions, hemoglobin prevents the blood from becoming too _____.8views
- Multiple Choice
In a neutral solution, the concentration of __________.
5333views29rank - Multiple Choice
A base _______:
3717views30rank - Multiple Choice
Which of the following statements about buffers is true?
4308views36rank - Multiple ChoiceA substance that minimizes changes in the concentration of H+ and OH– in a solution is a __________.1828views
- Multiple ChoiceA glass of grapefruit juice, at pH 3, contains __________ H+ as a glass of tomato juice, at pH 4.1356views
- Multiple ChoiceA solution at pH 6 contains __________ than the same amount of solution at pH 8.2015views
- Textbook Question
Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?
a. 4.0 M
b. 10¹⁰M
c. 10⁴M
d. 104M
1843views - Textbook Question
What is the hydroxide ion concentration of the lake described in question 3?
a. 10⁻¹⁰ M
b. 10⁻⁴ M
c. 10⁻⁷ M
d. 10.0 M
1351views - Textbook Question
A solution at pH 6 contains _________ H+ than the same amount of a solution at pH 8.
a. 20 times more
b. 100 times more
c. 2 times less
d. 100 times less
1540views - Textbook Question
A can of cola consists mostly of sugar dissolved in water, with some carbon dioxide gas that makes it fizzy and makes the pH less than 7. In chemical terms, you could say that cola is an aqueous solution where water is the _________, sugar is a _________, and carbon dioxide makes the solution _________.
a. solvent . . . solute . . . basic
b. solute . . . solvent . . . basic
c. solvent . . . solute . . . acidic
d. solute . . . solvent . . . acidic
1758views - Textbook Question
If you were given a solution that has a pH of 8.5, what would be its concentration of protons? What is the difference in proton concentration between this solution and one that has a pH of 7?
2020views - Textbook Question
A recent experimental study looked at the combined effects of ocean acidification and increased ocean temperatures, both aspects of climate change, on the growth of polyps, juvenile coral animals. Researchers reported the average polyp biomass (in μg/polyp) after 42 days of growth under four treatments: a control with pH and temperature maintained close to normal reef conditions, a pH lowered by 0.2 units, a temperature raised by 1°C, and a combined lower pH and higher temperature. The results showed that polyp biomass was reduced somewhat in both the low-pH and high-temperature treatments, but the combined treatment resulted in a reduction in growth by almost a third—a statistically significant result. Experiments often look at the effects of changing one variable at a time while keeping all other variables constant.
Explain why this experiment considered two variables—both a higher temperature and a lower pH—at the same time.
1307views