{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

summer 2006 exam2 practice

# summer 2006 exam2 practice - Form B 1 NAME General...

This preview shows pages 1–3. Sign up to view the full content.

Form B NAME: ______________________ SECTION:_____ General Chemistry 115 Exam 2 April 5, 2004 h = 6.63 x 10 -34 J . s 1 nm = 1 x 10 -9 m c = 3.00 x 10 8 m/s R H = 2.18 x 10 -18 s of H 2 O = 4.184 J/g C R = 0.0821 L . atm/ K . mol = 8.314 J/ K . mol 1 L . atm = 101.3 J 1 atm = 760 torr 1. A scientist studying the properties of hydrogen at low temperatures takes a 1.00 liter volume of hydrogen at 1.00 atm and a temperature of 25.00 degrees C and cools the gas at constant pressure to -200.00 degrees C. Predict the volume of the hydrogen after this process. a. 4.08 L b. 56.9 L c. - 0.800 L d. 0.844 L e. 1.33 x 10 7 L f. 9.33 x 10 -2 L g. 1.66 L h. 0.245 L 2. Concentrated nitric acid acts on copper to give nitrogen dioxide and dissolved copper ions, according to the following balanced equation. Cu (s) + 4HNO 3 (aq) 2 NO 2 (g) + Cu(NO 3 ) 2 (aq) + 2 H 2 O (l) If 13.3 grams copper is reacted with excess nitric acid at a constant the pressure of 1.10 atm and temperature of 25 degrees C, what was the work done on the surroundings by this process? Assume the copper metal and reacting nitric acid have negligible volume. a. - 18.3 J b. 26.6 J c. - 1.04 x 10 3 J d. 895 J e. - 1.88 x 10 6 J f. 13.8 J g. - 1.22 J h. - 2.99 x 10 -6 J 1 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Form B 3. Consider the following equation: NH 4 NO 3 (s) N 2 O (g) + 2H 2 O (g) Assume that NH 4 NO 3 (s) has negligible volume. Assume the reaction is carried out at constant temperature and an external pressure of one atmosphere. What is the sign of work? (negative or positive?)__________ Is the work done on the surroundings or on the system? _____________ If the reaction of one mole of NH 4 NO 3 (s) under these condition releases 36 kJ of heat, what is the sign of E? a. negative; on the surroundings; negative b. positive; on the surroundings; positive c. negative; by the surroundings; negative d. positive; by the surroundings; positive e.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern