ACS Exam Review
Topic 1: Naming Compounds
Name the following compounds:
Na3PO4
FeCl2
Write the molecule in symbol form:
Beryllium Nitride
Dinitrogen Tetraoxide
Topic 2: Limiting Reactant
If 45.0 g of H2S and 50.0 g of O2 were allowed to react in the equation, how many grams of S8
could be produced? If in the lab we produced 90% yield, how much S8 would we have?
8 H2S (g) + 4 O2 (g) à S8 (l) + 8 H2O (g)
Topic 3: Energetics
The specific heat of aluminum is 0.90 J/g-°C. When you add 250 J of heat to 30 g of aluminum
originally at room temperature (25°C), what will the final temperature be?
Find the ΔH for the reaction
2 N2(g) + 5 O2(g) 2 N2O5(g)
Using these reactions:
2 H2(g) + O2(g)
2 H2O(l)
N2O5(g) + H2O(l)
2 HNO3(l)
N2(g) + 3 O2(g) + H2(g)
2 HNO3(l)
Ho/kJ = -571.6
Ho/kJ = -73.7
Ho/kJ = -348.2
Topic 4: Electronic Structure
What is the frequency of a radiation with a wavelength of 567 nm?
What is the energy of a photon of electromagnetic radiation whose wavelength is 233 nm?
Topic 5: Quantum Numbers
Give the following quantum numbers possible for l, ml, and ms when n=2.
Give the electron configuration of Mn.
Topic 6: Lewis Structures
Draw the Lewis structures of the following compounds:
NH3
PBr5
SO3
Topic 7: Gas Law
How many grams of Helium will produce a pressure of 1.2 atm in a volume of 350 mL at 300 K?
Topic 8: Kinetics
1. For the reaction A + Bà AB, the following data was obtained
Trial
[A] (M)
[B] (M)
Initial Rate (M/s)
1
0.720
0.180
0.470
2
0.720
0.720
1.880
3
0.360
0.180
0.117
a) Determine the order for each reactant
b) What is the overall order of reaction?
c) Write the rate expression for the reaction
d) What is the value of the rate constant, k?
600 500 400 300 200 100 0 1/ [A] [A] Given the following graphs, what is the order of the reaction?
0 5000 10000 15000 ln(A) 7 6 5 4 3 5000 10000 Time (s) 0 5000 10000 Time (s) Time (s) 0 0.03 0.025 0.02 0.015 0.01 0.005 0 15000 15000 If the equation of the linear trendline is y= -0.0002 + 6.2251, what is the value of the rate
constant?
What is the half-life of the reaction?
What will [A] be at t= 10,000 seconds if the original concentration was 500 M?
The reaction below is showing _______ decay. Fill in the missing element with the atomic and
mass number.
!"#
!"𝐴𝑡
→ !!!𝛽 + _____
Topic 9: Acids/Bases/Buffers
Name the 7 Strong Acids
What is the pH of a solution containing 0.02 M NaOH?
Find the pH of a solution containing 0.21 M Nitrous Acid (HNO2). The Ka for nitrous acid is 4.0
x 10-4.
What would the pH be if you added 0.23 mol of NaNO2 and the solution had a total volume of 1
L.
Topic 10: Thermodynamics
Calculate the standard enthalpy, entropy, and free energy of the following reaction using the
formation values found in the table.
C2H4 (g) + 3 O2 (g) à 2 CO2 (g)+ 2 H2O (g)
Substance
ΔG°f (kJ/mol)
ΔS°f (J/mol*K)
ΔH°f (kJ/mol)
C2H4 (g)
68.4
219.5
52.3
O2 (g)
0
205.0
0
CO2 (g)
-394.3
213.7
-393.5
H2O (g)
-228.6
69.9
-241.8
If a reaction has a ΔH= 32 kJ and ΔS= 60 J, what will the ΔG be at 200 K? Is the reaction
spontaneous?
Topic 11: Electrochemistry
Balance the following equation
H3AsO4(aq) + Zn(s) → AsH3(g) + Zn2+(aq) (acidic)
Using the half reactions, calculate the free energy of the reaction.
Al3+(aq) + 3e- à Al (s) E°= -1.66 V
Au3+ + 3e-(aq) à Au (s) E°= 1.50 V