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FREE AND STUDY GAMES ABOUT BIOLOGY CHAPTER 3
EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -47 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: which of the following solutions would require the greatest amount of base to be added to bring the solution to a neutral pH
Answer:
gastric juice at pH 2
Question 2: One mole (mol) of glucose (molecular mass = 180 daltons) is
Answer:
180 kilograms of glucose Question 3: sulfur is in the same column of the periodic table of oxygen, but has electronegativity similar to carbon. Compared to water molecules, molecules of H2S
Answer:
will not form hydrogen bonds with each other Question 4: Equal volumes (5 mL) of vinegar from a freshly opened bottle are added to each of the following solutions. After complete mixing, which of the mixtures will have the highest pH?
Answer:
100 mL of household cleanser containing 0.5 M ammonia
Question 5: Why does evaporation of water from a surface cause cooling of the surface
Answer:
the water molecules with the most heat energy evaporate more readily
Question 6: Liquid water's high specific heat is mainly a consequence of the
Answer:
absorption and release of heat when hydrogen bonds break and form.Question 7: which of the following effects is produced by the same high surface tension of water
Answer:
a water strider can walk across the surface of a small pond
Question 8: Buffers are substances that help resist shifts in pH by
Answer:
releasing H+ to a solution when acids are added Question 9: CO2 is a readily soluble in water, according to the equation CO2+H2O > H2CO3.Carbonic acid is a weak acid. Respiring cells release CO2 into the bloodstream. what will be the effect on pH of blood as it first comes in contact with respiring cells
Answer:
blood pH will decrease slightly Question 10: Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that
Answer:
the concentration of hydrogen ions in solution X is 1,000 times as great as the concentration of hydrogen ions in solution Y
Question 11: If a solution has a pH of 7, this means that
Answer:
the concentration of H+ ions in the water equals the concentration of OH- ions in the water
Question 12: a beaker contains 100mL of NaOH solution at pH=3. A technician carefully pours unto the beaker 10mL of HCL at pH=1. Which of the following statements correctly describes the result of this mixing
Answer:
the pH of the beaker's contents falls Question 13: A dietary Calorie equals 1 kilocalorie. Which of the following statements correctly defines 1 kilocalorie?
Answer:
1,000 calories, or the amount of heat required to raise the temperature of 1 kg of water by 1°C Question 14: What is the pH of a solution with a hydroxyl ion [OH-] concentration of 10-12 M?
Answer:
pH 2 Question 15: how many grams of the compound in the figure above would be required to make 1 L of a 0.5 M solution (carbon=12, oxygen=16, hydrogen=1)
Answer:
150 Question 16: If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, this means that
Answer:
the concentration of H+ ions is tenfold higher in the mitochondrial matrix than in the cytoplasm
Question 17: The bonds that are broken when water vaporizes are
Answer:
hydrogen bonds between water molecules Question 18: we can be sure that a mole of table sugar and a mole of vitamin C are equal in their
Answer:
number of molecules
Question 19: How would acidification of seawater affect marine organisms?
Answer:
acidification would decrease dissolved carbonate concentrations and hunder growth of corals and shell-building animals Question 20: research indicates that acid precipitation can damage living organisms by
Answer:
buffering aquatic systems such as lakes and streams
Question 21: a strong acid like HCL
Answer:
ionizes completely in an aqueous solution
Question 22: Which type of bond must be broken for water to vaporize
Answer:
hydrogen bonds
Question 23: the partial negative charge in a molecule of water occurs because
Answer:
the electrons shared between the oxygen and hydrogen atoms spend more tie around the oxygen atom nucleus than around the hydrogen atom nucleus Question 24: what is the hydrogen ion (H+) concentration of a solution of a pH 8
Answer:
10^(-8) M
Question 25: Hydrophobic substances such as vegetable oil are
Answer:
nonpolar substances that repel water molecules Question 26: Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?
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