Ch. 15 & 10 solution & thermodynamics   test                                              Chemistry

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.  [50 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.  Describe how to prepare 235 mL 35 mM glucose using solid glucose and water ?  [10 points]


3.  It took 14.0 mL 0.5 M NaOH to titrate 55 mL HCl solution.  What is the [HCl] ?  [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” for valves of needed constants]