Chem 120 Pre Exam II Practice

Chem 120 Pre Exam II Practice - are contained in a 2.0 L...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem 120 Exam II Practice I. For the reactions below: 1. 15.0 g of zinc solid with 25.0 ml of 2.5 M HI solution 2. 35.0 g of magnesium bicarbonate solid with 35.0 ml of 6.00 M HBr a. Write balanced molecular and net ionic equations for the reactions, complete with subscripts. Identify the type of reactions, i.e. precipitation, gas formation, neutralization, decomposition, etc. b. Determine which is the limiting reactant when applicable . c. Calculate the mass of solid produced or the volume of gas produced at 22.5 o C and 750 mmHg. II. Write the oxidation states/numbers underneath each symbol and indicate with arrows the oxidized/reduced specie(s) in the reactants. Indicate also which is the oxidizing/reducing agent. 2 MnO 4 - + 5 C 2 O 4 -2 + 6 H + ------> 2 Mn 2+ + 10 CO 2 + 8 H 2 O III. Balance the following oxidation equations. Show the two half- reactions. Fe 2+ + Ce 4+ ------> Fe 3+ + Ce 3+ IV. 3.20 grams of oxygen gas, 2.01 grams of hydrogen gas and 14.0 grams of nitrogen gas
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: are contained in a 2.0 L container at 22.0 o C. a. Compare their kinetic energy and explain briefly. b. Compare their partial pressure and explain briefly c. Compare their effusion rate and explain briefly d. Calculate the ratio of their effusion rate. V. A pioneer stuck a 503 gram iron ball at 800 0C(Cp of Fe = 0.450 J/g.K)) into his coffee pot containing 0.250 L coffee. Assuming the density of coffee is 1.10 g/ml and the heat capacity is 4.10 J/g.K, calculate the final temperature of the coffee. VI. a. Calculate the ∆Hrxn for the following reactions: a.1. N 2 (g) + 3 H 2 (g) -----> 2 NH 3 (g) a.2. 4 NH 3 (g) + 5 O 2 (g) ----> 4 NO(g) + 6 H 2 O(l) a.3. H 2 (g) + ½ O 2 (g) -----> H 2 O(g) b. Using Hess’s Law and the information given in part a, calculate the ∆Hrxn for: ½ N 2 (g) + ½ O 2 (g) ----> NO(g)...
View Full Document

This note was uploaded on 10/19/2010 for the course CHEM 120 taught by Professor Sidharta during the Spring '10 term at Contra Costa College.

Ask a homework question - tutors are online