Matching -Phosphate (pK1 = 2.15, pK2 = 6.82, and pK3 = 12.38)will be mostly in the HPO42- form at pH 7.2.At pH 5.82 it is mostly in the ______ form.

A) hydrogen bond B) rotational C) H₃PO₄ D) H₂PO₄– E) HPO₄ 2– F)disordered G)positive entropy H)negative entropy I)higher electronegativity J)insoluble K)tetrahedral arrangement L)acid M)base N)only partially ionized A) hydrogen bond B) rotational C) H₃PO₄ D) H₂PO₄– E) HPO₄ 2– F)disordered G)positive entropy H)negative entropy I)higher electronegativity J)insoluble K)tetrahedral arrangement L)acid M)base N)only partially ionized

Exam 2: Water | Examlex

The pK_a of carbonic acid is 6.35.A solution is made by combining 50 mL 1.0 M carbonic acid, 2.0 mL 5.0 M KOH and 448 mL pure water (assume the total volume is 500 mL).Calculate the pH of the resulting solution.

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Question 21

The pH of a 0.1 M solution of sodium acetate would be

(Multiple Choice)

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Question 22

Fatty acids such as palmitate and oleate are usually characterized as

(Multiple Choice)

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Question 23

Matching -Translational and ______ thermal motion causes liquid water molecules to reorient approximately every 10^-12 seconds.

(Multiple Choice)

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Question 24

Solutions that contain a mixture of a weak acid and its conjugate base are known to resist changes in pH. a.Calculate the pH of 1.0 L of an aqueous solution containing 75 mmol of MES (pK_a = 6.09)and 25 mmol of its conjugate base. b.How much of a 5.0 M NaOH solution do you need to add to raise the pH to 6.09?

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Question 25

Which of the following statements about water is not true?

(Multiple Choice)

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Question 26

The boiling point of water is 264°C higher than the boiling point of methane because

(Multiple Choice)

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Question 27

The hydrophobic effect is an important driving force for protein folding and for the assembly of molecules into cellular structures. a.Give the definition of the hydrophobic effect b.What are amphiphilic (amphipathic)molecules? c.Which cellular structures are composed of many amphipathic molecules that are driven together under the influence of the hydrophobic effect?

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Question 28

Which of the following statements about hydrophobic interactions is not true?

(Multiple Choice)

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Question 29

Matching -The 104.5° bond angle in the water molecule is the result of the ______ of electron orbitals around oxygen.

(Multiple Choice)

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Question 30

Matching -Octane molecules dispersed in water tend to aggregate because that allows water molecules to be more ______.

(Multiple Choice)

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Question 31

Matching -Phosphate (pK₁ = 2.15, pK₂ = 6.82, and pK₃ = 12.38)will be mostly in the HPO₄^2- form at pH 7.2.At pH 5.82 it is mostly in the ______ form.

(Multiple Choice)

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Question 32

Matching -A solution containing a weak acid (pK = 7.5)and its conjugate base at pH of 8.5 has a good capacity to buffer the addition of ______.

(Multiple Choice)

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Question 33

To make an acetate buffer at pH 4.76 starting with 500 mL of 0.1 M sodium acetate (pK acetic acid = 4.76), you could add

(Multiple Choice)

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Question 34

You prepare a solution by mixing 50 mL 0.10 M sodium acetate and 150 mL 1.0 M acetic acid (pK_a 4.76). a.Calculate the pH of this solution. b.Can this solution be used effectively as a buffer (explain your answer)?

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Question 35

Which of the following is the best explanation for the hydrophobic effect?

(Multiple Choice)

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Question 36

A solution is made by mixing 1.0 mL of 1.0 M acetic acid (pK = 4.76, K_a = 1.74 x 10^-5 )with one 999 mL of pure water.Calculate the pH of the resulting solution (assume the total volume is 1.0 L).

(Multiple Choice)

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Question 37

The capacity of a buffer to resist changes in pH upon addition of protons or hydroxide ions depends on

(Multiple Choice)

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Question 38

Which of the following statements about water is incorrect?

(Multiple Choice)

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Question 39

Intracellular fluids and the fluids surrounding cells in multicellular organisms are full of dissolved substances, including nucleotides, amino acids, proteins and ions.The total concentration of substances determines the colligative properties of a fluid.Osmosis is one of several such colligative properties. a.Give the definition of osmosis. b.Eukaryotic cells are aqueous solutions surrounded by semipermeable membranes.Consequently, incubation of a cell in a solution of lower osmotic pressure would cause the cell to swell up and burst.Discuss two solutions that have developed during evolution to solve this problem.

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Question 40

Showing 21 - 40 of 59

Exam 2: Water

The pKa of carbonic acid is 6.35.A solution is made by combining 50 mL 1.0 M carbonic acid, 2.0 mL 5.0 M KOH and 448 mL pure water (assume the total volume is 500 mL).Calculate the pH of the resulting solution.

The pH of a 0.1 M solution of sodium acetate would be

Fatty acids such as palmitate and oleate are usually characterized as

Matching -Translational and ______ thermal motion causes liquid water molecules to reorient approximately every 10-12 seconds.

Which of the following statements about water is not true?

The boiling point of water is 264°C higher than the boiling point of methane because

Which of the following statements about hydrophobic interactions is not true?

Matching -The 104.5° bond angle in the water molecule is the result of the ______ of electron orbitals around oxygen.

Matching -Octane molecules dispersed in water tend to aggregate because that allows water molecules to be more ______.

Matching -Phosphate (pK1 = 2.15, pK2 = 6.82, and pK3 = 12.38)will be mostly in the HPO42- form at pH 7.2.At pH 5.82 it is mostly in the ______ form.

Matching -A solution containing a weak acid (pK = 7.5)and its conjugate base at pH of 8.5 has a good capacity to buffer the addition of ______.

To make an acetate buffer at pH 4.76 starting with 500 mL of 0.1 M sodium acetate (pK acetic acid = 4.76), you could add

You prepare a solution by mixing 50 mL 0.10 M sodium acetate and 150 mL 1.0 M acetic acid (pKa 4.76). a.Calculate the pH of this solution. b.Can this solution be used effectively as a buffer (explain your answer)?

Which of the following is the best explanation for the hydrophobic effect?

A solution is made by mixing 1.0 mL of 1.0 M acetic acid (pK = 4.76, Ka = 1.74 x 10-5 )with one 999 mL of pure water.Calculate the pH of the resulting solution (assume the total volume is 1.0 L).

The capacity of a buffer to resist changes in pH upon addition of protons or hydroxide ions depends on

Which of the following statements about water is incorrect?

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The pK_a of carbonic acid is 6.35.A solution is made by combining 50 mL 1.0 M carbonic acid, 2.0 mL 5.0 M KOH and 448 mL pure water (assume the total volume is 500 mL).Calculate the pH of the resulting solution.

Matching -Translational and ______ thermal motion causes liquid water molecules to reorient approximately every 10^-12 seconds.

Matching -Phosphate (pK₁ = 2.15, pK₂ = 6.82, and pK₃ = 12.38)will be mostly in the HPO₄^2- form at pH 7.2.At pH 5.82 it is mostly in the ______ form.

You prepare a solution by mixing 50 mL 0.10 M sodium acetate and 150 mL 1.0 M acetic acid (pK_a 4.76). a.Calculate the pH of this solution. b.Can this solution be used effectively as a buffer (explain your answer)?

A solution is made by mixing 1.0 mL of 1.0 M acetic acid (pK = 4.76, K_a = 1.74 x 10^-5 )with one 999 mL of pure water.Calculate the pH of the resulting solution (assume the total volume is 1.0 L).