Ch. 15 & 10 solution & thermodynamics **test** honors Chem

For problems involving calculations, show the relevant equation (or formula and conversion factor(s)), show your work in an organized manner, put the proper units in your calculations / answer, and have the proper number of significant figures in your answer. [55 points]

**Academic Honesty**: The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus. I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam. If you violate any of the preceding items or do not sign, your semester grade is a F.

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1. Describe how to prepare 235 mL 35 mM glucose using 65 mM glucose (C_{6 }H_{12 }O_{6 }) ? [10 points]

2. 0.64 grams of adrenaline dissolved in 36.0 grams of carbon tetrachloride raises its boiling point by 0.49 °C. K_{b } = 5.02 °C / molal. What is the molar mass of adrenaline ? [15 points]

3. It took 14.0 mL 0.5 M NaOH to titrate 55 mL H_{2 }SO_{4 } solution. What is the [H_{2 }SO_{4 }] ? [10 points]

4. Is ΔS positive, negative, or ambiguous (i.e. unclear) in the following reactions – justify your answer. [10 points]

a. dissolve solid sodium chloride in water

b. mix aqueous solution of potassium chloride and silver nitrate

5. How much heat is needed to change 15.0 grams of ice at 0 °C to water at 55.0 °C ? [10 points; hint: see “equation sheet”]