Unit 4 Quiz
Note: Exam 1 on 2/13/98 will be open book and notes. Please bringyour text, notes and a calculator with you on Friday. Open book does notmean "difficult". I want you to have access to tables and dataso I don't have to reproduce them for the test.
If you turn in this quiz by Wednesday evening, I will return it to youon Thursday morning.
Chemistry 211 WEB Quiz 4 (50 points) Name _______________________
1.(10) Consult the Solubility Table on page 167, For each reaction below,write the chemical equation describing the formation of the precipitate,b) the net ionic equation, c) and identify the spectator ions.
a) A solution of AgNO3 (aq) is mixed with a solution of sodium carbonate, (Na)2CO3 (aq).
b) A solution (NH4)2S (aq), ammonium sulfide, is mixed with a solution of cadmium nitrate, Cd(NO3)2 (aq).
2. (10) a) Identify the oxidation number of the italicized element ineach case below
i) H3P O4
ii) Br O4 (-) ion
iii) H2S O4
b) In the following reactions use oxidation numbers to identify the substance oxidized and the substance reduced:
i) Cl2 (g) + 2 I- (aq) = I2 (aq) + 2 Cl- (aq)
ii) 2 F2 (g) + 2 H2O (l) = 4 HF (aq) + O2 (g)
3. (8 ) a) What is the empirical formula of a compound which is 43.01% C , 2.58% H and 54.41 % Cl ?
b). What other information do you need in order to know the molecularformula of the compound?
4. (12) a) If you dissolve 15.0 grams of calcium chloride, Ca Cl2 , inenough water to make 500 mls of solution, what is the molarity of the resultingsolution ?
b) What is the molar concentration of the chloride ion in thecalcium chloride solution prepared in part (a)?
c) How many grams of sodium hydroxide would be delivered to a reactionvessel, if a student added exactly 65.25 mls of 0.350 M NaOH solution toit ?
d) How milliliters of 0.250 M KCl must be diluted to make 100 mls of0.150 M KCl ?
5. (10 ) Given the reaction of nitric acid, HNO3 (aq) with barium hydroxide,Ba(OH)2 (s).
2 HNO3 (aq) + Ba(OH)2 (s) = Ba(NO3)2 (aq) + 2 H2O (l)
a) How many grams of barium hydroxide will react completely in 100 mls of 0.500 M HNO3 (aq) ?
b) Suppose a chemist needs to neutralize (react completely) 52.5 grams of barium hydroxide and he has available exactly 1.20 liters of 0.500 M HNO3 , can he neutralize all the barium hydroxide ? Show your reasoning