ch02 - Chapter 2: Water Matching A) B) C) D) E) F) G) H) I)...

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Chapter 2: Water Matching A) hydrogen bond(s) B) rotational C) H 3 PO 4 D) H 2 PO 4 E) HPO 4 2– F) disordered G) positive entropy H) negative entropy I) higher electronegativity J) insoluble K) tetrahedral structure arrangement L) acid versus base M) base versus acid N) dissolved but only partially ionized 1. Translational and ______ thermal motion causes liquid water molecules to reorient approximately every 10 –12 seconds. Ans: B Level of Difficulty: Easy Section: 2.1.A Learning objective: Physical Properties of Water 2. The 104.5° bond angle in the water molecule is the result of the ______ of electron orbitals around oxygen. Ans: K Level of Difficulty: Easy Section: 2.1.A Learning objective: Physical Properties of Water 3. The polarity of the O–H bond is caused by the ______ of oxygen. Ans: I Level of Difficulty: Easy
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Section: 2.1.A Learning objective: Physical Properties of Water 4. For the ______ represented by D–H ⋅ ⋅ ⋅ ⋅ A, the donor D is weakly acidic and the acceptor A is weakly basic. Ans: A Level of Difficulty: Easy Section: 2.1.A Learning objective: Physical Properties of Water 5. Octane molecules dispersed in water tend to aggregate because that allows water molecules to be more ______. Ans: F Level of Difficulty: Easy Section: 2.1.C Learning objective: Physical Properties of Water 6. Although nonpolar molecules are attracted to water, their insolubility in water is due to the large ______ term (-T S), which is due to the water molecules dissolving the nonpolar molecule. Ans: H Level of Difficulty: Easy Section: 2.1.C Learning objective: Physical Properties of Water 7. A strong acid is completely ionized in water, whereas a weak acid is ______. Ans: N Level of Difficulty: Easy Section: 2.2.B Learning objective: Chemical Properties of Water 8. Phosphate, with a p K 2 of = 6.82, will be mostly in the HPO 4 2– form at pH 7.2. At pH 5.82 it is mostly in the ______ form. Ans: D Level of Difficulty: Easy Section: 2.2.C
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Learning objective: Chemical Properties of Water 9. A solution of buffer at a pH of 8.5 with a p K of = 7.5 would have more capacity to buffer the addition of ______. Ans: L Level of Difficulty: Easy Section: 2.2.C Learning objective: Chemical Properties of Water 10. A phosphate buffer solution at a pH = p K 1 = 2.15 would have equal amounts of phosphate in the ______ form and the H 2 PO 4 form. Ans: C Level of Difficulty: Easy Section: 2.2.C Learning objective: Chemical Properties of Water Multiple Choice 11. Hydrogen bonds within liquid water: A) are attractions between the protons of the oxygen nuclei. B) are attractions between two hydrogen atoms. C) are attractions between the H + and OH ions of the liquid. D)
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ch02 - Chapter 2: Water Matching A) B) C) D) E) F) G) H) I)...

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