Reactions
Stoichiometry
Gases
Solutions
Acid/Base
Thermochemistry
100
Bonds are broken, atoms rearrange, and new bonds are formed.
What is a chemical reaction?
100
Given the reaction:
2H2S + SO2 --> 3S + 2H2O
___ mole H2O is produced for every mole of H2S that reactions
1
100
Given three samples of gases (Neon, Oxygen, and Argon) at STP, which gas has the greatest average kinetic energy? the greatest average velocity?
All have the same average KE
Neon has the greatest average velocity
100
What three factors will increase the rate of dissolution for a solid in water?
Agitation, increasing surface area/crushing solid, increasing the temperature/heat
100
IUPAC name for H2SO3
Hydrosulfurous acid
100
During which intervals is potential energy changing and kinetic energy remaining constant?
B and D
200
The type of reaction shown below:
2Al + 3Cl2 --> 2AlCl3
Synthesis
200
Given the reaction:
2H2O --> 2H2 +O2
What is the relationship between the amount of H2 and O2 produced?
Twice as much H2 is produced as O2
200
Three identical flasks at STP are filled with 5 L of N2(g), O2(g), and NH3(g) respectively. Which gas contains the greatest number of molecules?
All have the same number of molecules/moles (Avogadro's Principle)
200
What volume of 12.0 M HCl is needed to prepare 100 mL of 1.5 M HCl?
12.5 mL
200
A solution with high conductivity (bright light bulb) and a pH of 12.00 is best identified as?
Strong Base
200
What is the amount of heat energy absorbed when 3.45 grams of copper is heated from 20.0C to 80.0C. The specific heat of copper is 0.385 J/gC.
79.7 J
300
Identify what completes the reaction below:
3Ca + 2 FeCl3 --> 2Fe + ______
3CaCl2
300
The reactant that is completely consumed
What is the limiting reactant?
300
The volume of a gaseous system is increased by a factor of 2 and the temperature is increased by a factor of 4. Does the pressure increase or decrease, and by what factor?
Pressure increases by a factor of 2
300
How many grams of potassium chloride are needed to prepare 250. mL of a 2.0 M solution?
37.3 g
300
What is the [H+] concentration of a solution with a pH of 3.4?
4 x 10-4
300
The heat of vaporization for water is 40.7 kJ per mole. How much energy is required to vaporize 53.4 grams of water?
121 kJ
400
Identify why the reaction shown below does not occur:
2Ag + Pb(NO3)2 --> 2AgNO3 + Pb
Activity Series, Ag is below Pb and therefore not able to replace it.
400
For the reaction:
2H2S + SO2 --> 3S + 2H2O
How many moles of S will be produced from 24.0 grams of H2S?
1.06 mol
400
A of 5.0 L helium balloon initially at 20.0C and 1 atm of pressure is released to the atmosphere where it is now at -10C and 0.65 atm. What is the new volume?
6.90 L
400
What is the net ionic equation for the reaction between iron (II) nitrate and potassium hydroxide?
Fe2+ + OH- --> Fe(OH)2
400
What is the [OH-] of a solution that has [H3O+]=2.45x10-9 M
4.08x10-6 M
400
Calculate the change in enthalpy (in kJ/molrxn) for the decomposition of sodium hydrogen carbonate from the standard enthalpies of formation:
2NaHCO3(s) --> Na2CO3(s) + H2O(g) + CO2(g)
DH°f (kJ/mol)
NaHCO3(s) -947.7
Na2CO3(s) -1130.9
H2O(g) -241.8
CO2(g) -393.5
129.2 kJ
500
The products of the following reaction:
Mg(OH)2 + 2HNO3 -->
Mg(NO3)2 + 2H2O
500
For the reaction:
2H2S + SO2 --> 3S + 2H2O
What volume of water vapor is produced from 24.0 grams of SO2 at STP?
16.8 L
500
1.24 moles of carbon dioxide occupies a 6.0 L container at 25C. What is the pressure of the sample in atm?
5.05 atm
500
Which of the following reactions result in a precipitate?
I. NaCl + AgNO3 -->
II. KNO3 + CuSO4 -->
III. Pb(NO3)2 + NaI -->
I and III
500
A student graphs the titration curve shown below during the titration of 0.320 M perchloric acid with a standardized solution of 0.500 M NaOH. What volume of perchloric acid was being titrated?
234 mL
500
66.1 kJ/mol
600
The balanced chemical equation when aluminum reacts with iron (II) sulfate.
2Al + 3FeSO4 --> Al2(SO4)3 + 3Fe
600
Given the reaction:
2H2S + SO2 --> 3S + 2H2O
What is the percent yield if 160 g of H2S reacts with excess SO2 to produce of 175 g S?
77.5%
600
A certain mass of oxygen was collected over water when potassium chlorate was decomposed by heating. The volume of the oxygen sample collected was 720. mL at 25.0°C and a barometric pressure of 755 mmHg. The vapor pressure of water at 25°C is 23.8 mmHg. What would the moles of the oxygen be?
0.0283 mol
600
Sodium metal reacts violently with water to form NaOH and release hydrogen gas. Suppose that 46 g of Na reacts completely with 3.00 L of water
2 Na(s) + 2 H2O(l) 2 NaOH(aq) + H2(g),
and the final volume of the system is 3.0 L. What is the molarity, M, of the NaOH solution formed by the reaction?
0.67 M
600
Given the reaction:
HF + C2H3O2- --> F- + HC2H3O2
HF and HC2H3O2 are both weak acids, but HF is a stronger acid. What is the value of K for this reaction in comparison to 1?
K is greater than 1.
BONUS: Identify the conjugate acid/base pairs.
600
-1313 kJ/mol