Chem 171 Quiz 3 Version A (Key Chrom/Emp) 1 These "fill-in-the-blanks" refer to the "Paper Chromatography" experiment. . a. The degree to which species are separated is called resolution. b. Transition metal ions form complexes in solutions. 2 A compound
Chem 171 Quiz 2 Version A 1.
In normal blood, there are about 5.4 x 109 red blood cells (rbc) per mL. The volume of a red blood cell is about 90.0 x 10 -12 cm3 and its density is 1.096 g/mL. How many liters of whole blood w
Chem 171 Quiz Version A Predict whether a reaction will occur in the following case. If there is a reaction write the molecular equation, complete ionic equation, net ionic equation and identify any spectator ions. Show the states. Lead nitrate + potas
Chem 171 Quiz 5 Version A (5 pts each) (Show work, unit, sig fig for full credit) Name (Key NIE/CO2) Sec Do these combinations lead to a reaction? Write the molecular equation if applicable. Which ions are spectator ions? Calcium nitrate (aq) + sodium
Chem 171 Quiz 6 Version A (5 pts each) (Show work, unit, sig fig for full credit) (Key CO2 / TernMix) What is pressure? Why is moist air less dense than dry air? N= 14.01; O=16.00; Ar=39.95. H=1.008. PV = nRT. R = 0.08206 L atm mol-1 K-1. 1 atm = 101,3
Chem 171 Q7 Version A 1.
(5 pts each) (Show work, unit, sig fig for full credit) (KEY TernMix /Tit) The following "fill-in the blanks" questions refer to the experiment entitled "Physical Separation of a Ternary Mixture".
a. All sulfides react with strong
Chem 171 Quiz 8 Version A (Key Tit/Antacid) A solution of malonic acid (a diprotic acid H2A), H2C3H2O4, was standardized by titration with 0.1000 N NaOH solution. If 23.95 mL of the NaOH solution were required to neutralize completely 10.00 mL of th
Chem 171 Quiz 9 Version A (Antacid Metal Key) The following questions pertain to the experiment entitled" Evaluating Commercial Antacids". Briefly explain why CaCO3 would be a good source for a woman suffering from chronic heartburn. Use a net ionic eq
Chem 171 Quiz 10 Version A (Metal Enthalpy Key) Hydrogen gas produced in the following reaction is collected over water at 296 K; the pressure is 742 mmHg. 2 Al (s) + 6 HCl 2 AlCl3 (aq) + 3 H2(g) What volume of the "wet" gas will be collected in the re
1. a. A student found that her mixture was 13% NaCl, 75% KBr, and 19% Fe(OH)2. What
did she likely do incorrectly during the experiment to account for these numbers?
The liquid used during the filtration was no
Chem 171 Quiz 4 Version A 1.
(Key Emp NIE)
Determine the empirical formula of each of the following compound: 0.063 mol of chlorine atoms combined with 0.22 mol of oxygen atoms. Cl = 35.45. O = 16.00.
0.063 mol Cl 0.063 mol Cl 0.22 mol O 0.063 mol Cl
Chem 171 Quiz 3 Version A (Key Chrom/Emp) During a paper chromatography experiment, a student obtains two Rf values.: Rf for A = 0.71 and Rf for B = 0.42 . The solvent front for the original chromatogram was 17.0 cm. If A and B are run on a second simi
Chem 171 Quiz 1 V. A (5 pts each) (Show work , unit, sig fig for full credit) 1. If you must smell a chemical, what is the procedure? Waft the odor under your nose How do you handle poisonous or noxious gases in the lab? Use the fume hood
2. This questi
Chem 171 Quiz 1 Version A What should you do if you get chemicals in your eyes?
Go to the eye wash station Forcibly hold your eye open if necessary Flush continually with water An ice cube with a volume of 45.0 mL and a density of 0.9000 g/cm3 floats i
Chem 171 Quiz 2 Version A 1. A 32.65 g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.00 mL. The solid and toluene together weigh 58.58 g.
Chem 171 Quiz 4 Version A (Key Emp NIE) 1. The molar mass of the compound with empirical formula P2O5 is 284 g per mol. What is the molecular formula of the compound? (P = 30.97, O = 16.00) Empirical formula mass is (2 x 30.97) + (5 x 16.00) = 61.94 + 80.
Chem 171 Quiz 5 Version A (5 pts each) (Show work, unit, sig fig for full credit) Name (NIE/Metal Key) Sec Does a reaction occur when PbCO3 is mixed with CH3COOH? If a reaction occurs, show the molecular equation, the total ionic equation and the net i
Chem 171 Quiz 6 Version A (Metal/TernMix Key) For the following reaction: 3 Cu(s) + 8 H+(aq) + 2 NO3(aq) 3 Cu2+(aq) + 2 NO(g) + 4 H2O(l) Identify the element that is being oxidized. Identify the element that is being reduced. Identify the reducing a
Chem 171 Q7 Version A (5 pts each) (Show work, unit, sig fig for full credit) (Key TernMix/Tit) When we add ammonia to a solution containing copper ion, a precipitate forms. Upon addition of more ammonia, the precipitate dissolves. Write the two net io
Chem 171 Quiz 8 Version A (Key Tit/Antacid) Some automatic titrators measure the slope of a titration curve to determine the equivalence point. What happens to the slope that enables the instrument to recognize this point? Why is the center of the buff
Chem 171 Quiz 10 Version A (CO2 Enthalpy Key) o Calculate the density of SO2 gas at 40 C and 730 mmHg? PV = nRT and R = 0.08206 L atm mol-1 K-1. S = 32.1. O = 16.0.
PV = nRT PV = mRT/M P = mRT/VM = dRT/M d = PM/RT d = 0.961 atm x 64.1 g / mol / 0.08206
LAB 1: Determination of the Density of a Solid
Experimental errors: equipment being used or human error
Accuracy: how close the measurement is to the accepted value or theoretical value
Precision: repeatability of the measurement