Topics that should be easy
What is the atomic notation for 8 p+, 10 n0, and 8 e-?
Write the balanced equation when hydrogen sulfide gas is bubbled through a solution of lead(II) nitrate forming a black precipitate of lead(II) sulfide and nitric acid.
H2S (g) + Pb(NO3)2 (aq) --> PbS (s) + 2 HNO3 (aq)
What are the molarity and mass percent of 25.0 g of NaCl dissolved in 100.0 g of water (assume the density of water is 1.00 g/mL)?
4.28 M and 20.0 %
What is a solvent that will be miscible with propanol (CH3CH2CH2OH)?
State the primary intermolecular force in propanol.
When ordering a set of molecules for increasing boiling point, how should you compare the molecules?
water
H-bonding
Think about strength of interaction and molar mass.
Cl has 7 and Cl- has 8
A 26.47 g pellet of lead was heated to 89.98 oC. It was then added to a constant-pressure calorimeter of negligible heat capacity containing 100.0 g of water. The water temperature rose from 22.50 oC to 23.17 oC. What is the specific heat of lead?
0.16 J/goC
The reaction
Zn (s) + 2HCl (aq) --> ZnCl2 (aq) + H2 (g)
was performed. Hydrogen gas was collected in a 3.00 L flask at 28 oC and 781.7 mmHg. What is the mass of hydrogen gas produced and the mass of Zn metal used?
The reaction produced 0.245 g of hydrogen gas. The reaction used 7.94 g of zinc metal.
What is the balanced chemical equation when mercury(I) nitrate is mixed with sodium chloride?
Hg2(NO3)2 (aq) + 2NaCl (aq) --> Hg2Cl2 (s) + 2NaNO3 (aq)
State the hybridization for all of the carbon and oxygen atoms in acetic acid. Label the bonds as sigma or pi and as single, double, or triple. State the geometry about both carbon atoms and the oxygen atom of the hydroxide.
sp3 carbon in H3C-; tetrahedral geometry
sp2 for both the carbon and oxygen in the C=O; trigonal planar geometry
sp3 for the O in the HO-C; bent geometry
all single bonds, sigma only
double bond, 1 sigma and 1 pi
What is the empirical and molecular formula for a compound with an approximate molar mass of 165-170 g/mol and the following percentage composition: 42.87 % carbon, 3.598 % hydrogen, 28.55 % oxygen, 25.00 % nitrogen.
empirical formula: C2H2ON
molecular formula: C6H6O3N3
What is the concentration of nitric acid if 3.701 g of potassium hydroxide are needed to neutralize 27.5 mL of the nitric acid solution?
2.398 M
Write the molecular, ionic, and net ionic equation when a solution of sodium hydroxide is mixed with iron(III) hydroxide.
molecular equation: 3NaOH (aq) + Fe(NO3)3 (aq) --> 3NaNO3 (aq) + Fe(OH)3 (s)
ionic equation: 3Na+ (aq) + 3NO3- (aq) + Fe3+ (aq) + 3OH- (aq) --> 3Na+ (aq) + 3NO3-(aq) + Fe(OH)3 (s)
net ionic: 3OH- (aq) + Fe3+ (aq) --> Fe(OH)3 (s).
What are the four quantum numbers for the 4th p-electron in oxygen.
n = 2; l = 1; ml = 1; ms = -1/2
Convert 27 nm to units of inches.
1.1 x 10-6 in
How much energy does it take for 78.201 g of liquid water at 33.2 oC to steam at 150.0 oC?
206,000 J
How many grams of Ba(NO3)2 are required to precipitate all the sulfate ion present in 15.3 mL of 0.139 M H2SO4 solution?
0.556 g
State the species being oxidized and the species being reduced in the following reaction,
CuCl2 (aq) + Zn (s) --> ZnCl2 (aq) + Cu (s)
Cu is reduced.
Zn is oxidized.
What is the electron configuration for Se?
1s22s22p63s22p64s23d104p4
What are the masses of nitrogen and water produced when 25.0 g of hydrazine is ignited in the presence of 20.0 g of pure oxygen in the reaction,
N2H4 (l) + O2 (g) --> N2 (g) + H2O (g)?
17.5 g N2 and 22.5 g H2O
A 1.201 M solution of nitric acid was titrated with 23.24 mL of 2.300 M of calcium hydroxide. What volume of nitric acid was used?
89.01 mL HNO3
What is the heat of combustion for the reaction, 2C2H2 (g) + 5O2 (g) --> 4CO2 (g) + 2H2O (l).
-2599 kJ