General Chemistry Answers

For the equilibrium reaction

2SO₂(g) + O₂(g) ↔2SO₃(g) (H° = -198 kJ) 

which one of the following factors would cause the equilibrium constant to increase?

1. Add SO₂ gas.
2. Decrease the temperature.
3. Add a catalyst.
4. None of the above.

The following reaction is at equilibrium at one atmosphere, in a closed container.

NaOH(s) + CO₂(g) ↔ NaHCO₃(s)

Which, if any, of the following actions will decrease the total amount of CO₂ gas present at equilibrium?

1.decreasing the volume of the container

2.removing half of the solid NaHCO₃

3.adding more solid NaOH

4.adding N₂ gas to double the pressure

5.None of the above.

1. The soda cans used in this experiment are coated with a combination of paint and a protective polymer to protect the Aluminum from the acidic contents of soda. Describe how you could evaluate the total mass of the coating material on the can?
2. Would this technique be useful on a sample known to be made of pure Al? What about a sample of Al coated with a different metal such as Zinc?
3. A large water tank is used to equalize the level of liquid inside the buret and the liquid level outside the buret. If this step is skipped, how would the difference in volume affect the final mass of Al and your percent purity?
4. Zinc is also fairly reactive with HCl. Write a chemical equation and suggest a factor that would need to be considered for this experiment if the soda cans where made from Zinc?

What is the concentration of hydronium ions in a solution which is 0.5M with respect to nitrous acid and 0.65M with respect to sodium nitrite? Assume that sodium nitrite is completely ionized.

What is the concentration of ammonia that reacts with water to produce ions to the extent of 1.98 percent? ionization constant of ammonia is 1.81x10^-5

H2O2 (aq) + 3 I-(aq) + 2 H+(aq) → I3- (aq) + 2 H2O (l)

In the first 59.1 seconds of the reaction, the concentration of I- decreased from 1.046 M to 0.364 M. 

What is sulphur

What volume (in mL) of 0.4050M calcium chloride reacts completely with 25.00mL of 0.2800M silver nitrate?

Predict the type of bond formed between cesium (Cs) and fluorine (F). The electronegativity value of Cs is 0.9, and F is 4.0.

Each of the first 3 cylinders has a volume of 5.0L. If the gases in all 3 cylinders below were combined into one cylinder with a volume of 5.0L at constant temperature, what would the total pressure be?