Chem Worksheet

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Question 1
Consider the following equilibrium.4NH3(g) + 3O2(g)
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2N2(g) + 6H2O(g)Suppose 0.30 mol of NH3 and 0.40 mol of oxygen are added to a 5.0-L container. If x mol of water is present at equilibrium, what is the equilibrium concentration of oxygen?Answer 0.40 - 0.50x |

0.30 - 0.50x |
0.08 - 0.10x |
0.06 - 0.13x |
0.40 - | View Full Image | | x |
4 points
Question 2
At 298 K, the value of Kc for the reaction H2(g) + Br2(g) | View Full Image | |
2HBr(g) is 2.0 × 1019. What is Kc for HBr(g)
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½H2(g) + ½Br2(g)?Answer
-2.0 × 1019 |
5.0 × 10-20 |
2.2 × 10-10 |
4.0 × 10-38 |
1.0 × 1019 |
4 points
Question 3
Consider the following equilibrium:2NH3(g)
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N2(g) + 3H2(g); ΔH = 92 kJWhat change should be made in order to increase the value of Kp for this reaction? Answer Increase the temperature. |
Decrease the temperature. |
Increase the pressure. |
Decrease the pressure. |
Nothing; Kp cannot be changed. |
4 points
Question 4
One method for the decomposition of carbon dioxide proceeds as follows:2CO2(g) | View Full Image | |
2CO(g) + O2(g); ΔH= 559 kJWhich of the following changes will cause an increase in the equilibrium concentration of CO?Answer increasing the pressure of the system at constant temperature | adding more O2 to the system |

removing CO2 from the system |
increasing the temperature of the system |
adding a catalyst |
4 points
Question 5
Which of the following correctly describes the equilibrium constant for the gas-phase reaction between H2 and O2 to form gaseous H2O?Answer Kc = | View Full Image | | |
Kc = | View Full Image | | |
Kc = | View Full Image | | |
Kc = | View Full Image | | |
Kc = [H2O] |
4 points
Question 6
Consider the following equilibrium:C2H6(g) + C5H12(g)
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CH4(g) + C6H14(g); Kp = 9.57 at 500 KSuppose 19.6 g each of CH4, C2H6, C5H12, and C6H14 are placed in a 40.0-L reaction vessel at 500 K. What is the value of Qp?Answer 1.00 |
9.57 |
0.637 |
1.57 |
0.104 |
4 points
Question 7
Carbon tetrachloride may react with oxygen to produce chlorine and carbonyl chloride.2CCl4(g) + O2(g) | View Full Image | |
2COCl2(g) + 2Cl2(g); Kc = 9.9 × 1051What is Kc for the following equilibrium?COCl2(g) + Cl2(g) | View Full Image | |
CCl4(g) + ½O2(g)Answer
-9.9 × 1051 |
1.0 × 10-26 |
9.9 × 10-51 |
1.0 × 10-52 |
5.0 × 10-53 |
4 points
Question 8
What effect will spraying liquid water into a system have if NH3 is far more soluble in water than is N2 or H2?N2(g) + 3H2(g) | View Full Image | |
2NH3(g)Answer
This will not affect the system. |
More NH3(g) will form. |
More N2(g) will form. |
Less NH3(g) will form. |
More H2(g) will form. |
4 points
Question 9
Hydrogen iodide undergoes decomposition according to the equation2HI(g) | View Full Image | |
H2(g) + I2(g)The equilibrium constant Kp at 500 K for this equilibrium is 0.060. Suppose 0.637 mol of HI is placed in a 8.50-L container at 500 K. What is the equilibrium concentration of H2(g)?(R = 0.0821 L · atm/(K · mol))Answer 0.075 M |

0.037 M |
0.13 M |
0.015 M |
0.61 M |
4 points
Question 10
Which of the following statements is incorrect concerning the addition of a catalyst to an equilibrium reaction system?Answer The catalyst increases the rate of both the forward and the reverse reaction. | If the reactants are capable of forming many different products, a...
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