Hi, I have a few questions I'm having trouble answering. Could someone please help me with these? They're general chemistry. I've answered some of them but some of my answers are wrong.
.1. Consider 400 mL of a solution of containing 0.20 M NH3 and 0.30 M NH4Cl to which 100 mL of 0.05 M NaOH is added (Kb for NH3 is 1.8x10-5). What is the resulting pH after the addition of the NaOH?
.. 2. What will happen to the temperature of the system at equilibrium, shown below, as SO2 is added to the system
..Heat + SO2Cl2 (g) ↔ SO2 (g) + Cl2 (g)
.. 5. What is the formula for the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate? .
. 10. A sample of an gas at 50.0°C has its Celsius temperature halved while the pressure of the gas doubles. If the initial volume is 400. mL, what is the final volume?
.. 11. Hydrogen sulfide reacts with sulfur dioxide to give H2O and S. If 6.00 L of H2S gas at 750. torr produced 3.20 g of sulfur, what is the temperature in C?
.. 17. Which of the following affects the rate of a reaction?
. a. the frequency of collisions
b. the kinetic energy of collisions
c. the orientation of collisions
d. all of these factors affect the rate of a reaction
e. none of these factors affect the rate of a reaction
15. Which solution would have the greatest freezing point depression, given the Kf for water is 1.86 °C kg/mol?:
a. 190.4 g of magnesium chloride in 50.0 g of water
b. 116.9 g of sodium chloride in 50.0 g of water
c. 360.3 g of glucose in 50.0 g of water
d. all of these solutions would have the same freezing point
20. Which species is the reduction agent in the following equation:
2 PbS(s) + 3 O2 (g) → 2 PbO(s) + 2 SO2 (g):
a. PbS
b. O2
c. PbO
d. SO2
21. A solution is prepared by dissolving 10.8 g ammonium sulfate in enough water to make 100.0 mL stock solution. A 10.00-mL sample of this stock solution is then placed in a 50.00-mL volumetric flask and diluted to the mark with water. What is the molarity of the new solution?:
a. 0.818 M
b. 0.164 M
c. 0.000818 M
d. 0.000164 M
22. The first-order rate constant for the decay of the radioactive isotope tritium is 0.056 year-1. What fraction of the tritium initially in a sample is still present 50 years later?:
a. 0.061
b. 0.25
c. 0.75
d. 0.94
23. Is the reaction between aqueous solutions of barium chloride and sulfuric acid spontaneous?:
a. Yes since ΔGro is positive.
b. No since ΔGro is positive.
c. Yes since ΔGro is negative.
d. No since ΔGro is negative.
28. When aqueous solutions of potassium hydroxide and iron (III) nitrate are mixed what are the spectator ions?:
a. K+ and NO3-
b. K+ and OH-
c. Fe3+ and OH-
d. Fe3+ and NO3-
29. In a laboratory experiment, 10.8 g copper (II) chloride was reacted with 18.4 g sodium nitrate. The actual yield of sodium chloride was 6.2g. What was the percent yield?:
a.44%
b.49%
c.51%
d.66%
30. Name the following molecule.:
a. 3-methyl-4-ethyl-6-chloro-5-heptanone
b. 2-chloro-4-ethyl-5-methyl-3-heptanone
c. 2-chloro-3-oxy-4-ethyl-5-methyl-heptane
d. 1-chloro-1,4-dimethyl-3-ethyl-2-oxy-hexane
.1. Consider 400 mL of a solution of containing 0.20 M NH3 and 0.30 M NH4Cl to which 100 mL of 0.05 M NaOH is added (Kb for NH3 is 1.8x10-5). What is the resulting pH after the addition of the NaOH?
.. 2. What will happen to the temperature of the system at equilibrium, shown below, as SO2 is added to the system
..Heat + SO2Cl2 (g) ↔ SO2 (g) + Cl2 (g)
.. 5. What is the formula for the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate? .
. 10. A sample of an gas at 50.0°C has its Celsius temperature halved while the pressure of the gas doubles. If the initial volume is 400. mL, what is the final volume?
.. 11. Hydrogen sulfide reacts with sulfur dioxide to give H2O and S. If 6.00 L of H2S gas at 750. torr produced 3.20 g of sulfur, what is the temperature in C?
.. 17. Which of the following affects the rate of a reaction?
. a. the frequency of collisions
b. the kinetic energy of collisions
c. the orientation of collisions
d. all of these factors affect the rate of a reaction
e. none of these factors affect the rate of a reaction
15. Which solution would have the greatest freezing point depression, given the Kf for water is 1.86 °C kg/mol?:
a. 190.4 g of magnesium chloride in 50.0 g of water
b. 116.9 g of sodium chloride in 50.0 g of water
c. 360.3 g of glucose in 50.0 g of water
d. all of these solutions would have the same freezing point
20. Which species is the reduction agent in the following equation:
2 PbS(s) + 3 O2 (g) → 2 PbO(s) + 2 SO2 (g):
a. PbS
b. O2
c. PbO
d. SO2
21. A solution is prepared by dissolving 10.8 g ammonium sulfate in enough water to make 100.0 mL stock solution. A 10.00-mL sample of this stock solution is then placed in a 50.00-mL volumetric flask and diluted to the mark with water. What is the molarity of the new solution?:
a. 0.818 M
b. 0.164 M
c. 0.000818 M
d. 0.000164 M
22. The first-order rate constant for the decay of the radioactive isotope tritium is 0.056 year-1. What fraction of the tritium initially in a sample is still present 50 years later?:
a. 0.061
b. 0.25
c. 0.75
d. 0.94
23. Is the reaction between aqueous solutions of barium chloride and sulfuric acid spontaneous?:
a. Yes since ΔGro is positive.
b. No since ΔGro is positive.
c. Yes since ΔGro is negative.
d. No since ΔGro is negative.
28. When aqueous solutions of potassium hydroxide and iron (III) nitrate are mixed what are the spectator ions?:
a. K+ and NO3-
b. K+ and OH-
c. Fe3+ and OH-
d. Fe3+ and NO3-
29. In a laboratory experiment, 10.8 g copper (II) chloride was reacted with 18.4 g sodium nitrate. The actual yield of sodium chloride was 6.2g. What was the percent yield?:
a.44%
b.49%
c.51%
d.66%
30. Name the following molecule.:
a. 3-methyl-4-ethyl-6-chloro-5-heptanone
b. 2-chloro-4-ethyl-5-methyl-3-heptanone
c. 2-chloro-3-oxy-4-ethyl-5-methyl-heptane
d. 1-chloro-1,4-dimethyl-3-ethyl-2-oxy-hexane
