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100
What is the multiplier for the metric prefix "n"?
1x10^-9
100
Rank the following spheres (diameter = 10.00 cm) in order of increasing mass: iron (d = 7.86 g/mL), gold (d = 19.3 g/mL), titanium (d = 4.51 g/mL)
titanium < iron < gold
100
Is the following reaction exothermic or endothermic? 3Fe2O3 (s) + CO (g) --> 2Fe3O4 (s) + CO2 (g) dH = -48.5 kJ
Exothermic because dH is negative
100
Write a balanced chemical reaction for the combination of potassium metal and nitrogen gas
6K (s) + N2 (g) --> 2K3N (s)
100
Write the equilibrium constant equation for H2 (g) + I2 (g) <---> 2HI (g)
K = ([HI]^2)/([H2][I2])
200
Place the following measurement, in order, from smallest to largest: 5.06x10^3 m, 2.71x10^3 m, 9.35x10^2 m, 3.22x10^4 m
9.35x10^2 m < 2.71x10^3 m < 5.06x10^3 m < 3.22x10^4 m
200
Convert 3.92801x10^8 nm to cm
(3.92801x10^8 nm)(1x10^-9 m/ 1 nm)(100 cm/ 1 m) = 39.2801 cm
200
Given the following reaction: CH3OH (l) --> CO (g) + 2H2 (g); what is the sign of dS?
Positive, because it's going from a liquid on the left to gasses on the right. The system is becoming more disordered.
200
Identify the oxidation number of each element in K3PO4
K = +1, O = -2, P = +5
200
Given the following reaction: 2C (s) + O2 (g) <--> 2CO (g); in what direction would the equilibrium shift if the volume was decreased (increasing pressure)?
Equilibrium would shift left (towards reactant), because of fewer mole of gas
300
An object has a mass of 52.862g. If the object is placed in a measuring cylinder containing 46.8mL of water, and the water level rises to 65.1mL, what is the density of the object?
65.1mL - 46.8mL = 18.3mL; 52.862g/18.3mL = 2.888634g/mL = 2.89g/mL
300
Calculate the mass of 0.7685 mole of glycerol (C3H8O3)
[(3x12.01 g/mol)+(8x1.008 g/mol)+(3x16.00 g/mol)](0.7685 mol) = 70.77 g C3H8O3
300
For the reaction: Xe (g) + 3F2 (g) --> XeF6 (g), dH = -96.08 kcal/mol and dS = -97.80 cal/molK. Calculate the value of dG at -100.0C
dG = dH - T(dS) = -96.08kcal/mol - 173.15K(-0.09780 kcal/molK) = -79.15 kcal/mol Make sure you convert deg C to K (K = degC +273.15) Make sure you convert dS to kcal/molK so you can combine with dH.
300
Write a balanced chemical equation for the the reaction between aqueous solutions of copper(II) sulfate and strontium perchlorate
CuSO4 (aq) + Sr(ClO4)2 (aq) --> Cu(ClO4)2 (aq) + SrSO4 (s)
300
Given the following reaction at equilibrium: 2C (s) + O2 (g) <--> 2 CO (g), dH = -221kJ, in what direction will the equilibrium shift if the reaction flask is cooled?
To the right (towards products), because the forward reaction is exothermic and would want to replace the heat taken away from it
400
When creating iron metal, what is the limiting reagent if 60.0 g of iron(III) oxide and 5.00 g of carbon react in: Fe2O3 (s) + C (s) --> Fe (s) + CO2 (g), and how many mole of Fe can be created?
Carbon (0.55509 mol Fe vs 0.7514 mol Fe from Fe2O3)
400
Convert 28.4 um/s^2 to km/day^2
(28.4um/s^2)(1x10^-6m/1um)(1km/1000m)[(60s/1min)^2][(60min/1hr)^2][(24hr/1day)^2] = 212.004864 km/day^2 = 212 km/day^2
400
17.68 kcal of energy are required to heat 300.0g of water to a temperature of 96.3C. What was the initial temperature of the water?
dT = q/Cm = [17.68kcal/(1.000 cal/gC)(300.0g)](1000cal/kcal) = 58.93C; T final - dT = T initial; 96.3C - 58.93C = 37.4C
400
Write the net ionic equation for the following molecular equation: Pb(NO3)2 (aq) + (NH4)2SO4 (aq) --> PbSO4 (s) + 2NH4NO3 (aq)
Pb2+ (aq) + SO42- (aq) --> PbSO4 (s)
400
Given the following reaction: 2C (s) + O2 (g) <--> 2CO (g) dH = -221 kJ, in what direction will the equilibrium shift if a catalyst is added that speeds the reaction?
None. A catalyst has no affect on the equilibrium of a reaction
500
Identify the element oxidized, the element reduced, the oxidizing agent, and the reducing agent in the following reaction: 8NH3 (g) + 6NO2 (g) --> 7N2 (g) + 12H2O (g)
N from NH3 is oxidized, N from NO2 is reduced, NO2 is the OA, NH3 is the RA
500
What mass of carbon is required to react with excess bismuth(III) oxide in order to prepare 100.00g of bismuth metal? Bi2O3 (s) + C(s) --> Bi(s) + CO(g)
100.00g Bi(1mol/208.98g Bi)(3mol C/2mol Bi)(12.011g/1mol C) = 8.62115992g C = 8.6212 g C
500
If dH is (+) and dS is (+), what conditions of T will produce a spontaneous reaction (high, low, all, or no T)?
High T [dG = dH - T(dS)]
500
Write a balanced chemical equation for the combustion of cyclopentane C5H10 (l)
2C5H10 (l) + 15O2 (g) --> 10CO2 (g) + 10H2O (g)
500
How would increasing [NH3] (g) affect the rate of the forward reaction for: 3H2 (g) + N2 (g) --> 2NH3 (g)?
Increasing the concentration of a product has no affect on the rate of forward reaction