Ch. 13 & 15  gas & solution   test       65 points                                honors Chem

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

1.  A 45.0 mL syringe has a pressure of 95.0 kPa at 21.0 °C.  The syringe’s volume was reduced to 25.0 mL and its temperature was reduced to 4.0 °C.  What is the new pressure in the syringe ?  [10 points]

2.  At STP, 5.0 L nitrogen gas reacts with 12.0 L hydrogen gas to form ___ g of ammonia gas, NH₃.  [15 points]

3.  Describe how to prepare 275 mL of a 525 mM aqueous solution of glucose, C₆H₁₂O₆ ?  [10 points]

4.  The addition of excess sodium carbonate to 25.0 mL of an aqueous solution of silver nitrate formed 1.0 g of a precipitate.  What is the concentration of silver nitrate before the addition

of sodium carbonate ?  [15 points]

5.  10.0 mL 25 mM silver nitrate was mixed with 15.0 mL 20.0 mM potassium chloride.  How many grams of  ____ remain at the end of the reaction ?   [15 points]

a.  excess reactant  [10 points]

b.  precipitate  [5 points]