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.

                                                                        Signature:  ___________________

 
1.  Describe how to prepare 235 mL 35 mM glucose using 65 mM glucose (C6 H12 O6 ) ?  [10 points]

2.  0.64 grams of adrenaline dissolved in 36.0 grams of carbon tetrachloride raises its boiling point  by 0.49 °C.  Kb = 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 H2 SO4 solution.  What is the [H2 SO4 ] ?  [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”]