Show:
Moles & Stoichiometry
Gas Laws
Solutions
Thermochemistry
Kinetics/Equilibrium
100
Substances which are termed by formula masses
What are ionic compounds?
100

This gas law demonstrates how using a bicycle pump, inflates a tire.

What is Boyle's Law?

100
List three actions that can increase the rate of solution of a solute in a solvent.
What is crushing the solute to increase surface area, heating, stirring?
100
Give three examples of state functions.
What are temperature, volume, pressure, enthalpy, entropy, and Gibbs Free Energy?
100
How do the relative rates of the forward and reverse reactions in a reversible reaction affect the quantities of reactants and products at equilibrium?
If the forward rate > reverse rate, there are more products. If the reverse rate > forward rate, there are more reactants.
200
A laboratory technician ran an analysis on of the germicides stocked by a janitorial service. The technician determined that the effective ingredient in the germicide was a compound that was 33% sodium, 36% arsenic and the rest oxygen. What is the formula for this compound?
What is Na3AsO4?
200

A gas of volume, V, is placed in a container. Determine the new volume if the pressure doubled and the absolute temperature is halved. Express your answer in terms of 'V'.

What is 1/4 V?

200
What effect would an increase in pressure have on the solubility of a solid in a liquid?
What is nothing? Pressure has a negligible effect on the solubility of a solid in a liquid. (unlike gases in liquids which would be directly related)
200
A student describes the burning of a lantern as an endothermic reaction because heat was needed to start the burning. Is this statement a valid description? Explain in terms of energy(s).
What is no? The reaction is exothermic, but activation energy is needed.
200
What happens to the rate of a second order reaction if the concentration of one of its reactants is halved?
What is quartered?
300

A mixture of salt and pepper analyzes at 50% chlorine. If pepper contains no chlorine, what percent of the mixture is pepper?

What is 20%?

300

Assume 2.00 L of helium, 4.50 L of oxygen, and 3.00 L of argon at 18 C and 100.0 kpa are pumped into a 0.500L container. A solid substance is introduced into the container and all of the oxygen reacts with it. What will be the final pressure in the container. Assume the temperature does not change and the substance has a negligible volume.

What is 1.00 x 103 kPa?

300
A solution is prepared containing 84.0 g of lithium nitrate trihydrate in 3.00 x 102 g of water. What is the molality of the lithium ions?
What is 2.03 m of lithium ions?
300
Carbohydrates are broken down in the cells to release carbon dioxide and water. Will the change in entropy be positive or negative?
What is positive?
300
How would decreasing the temperature of an endothermic process affect the equilibrium?
What is the equilibrium will shift to the left, toward the reactants?
400

Identify the limiting reactant. Explain. Sulfur in the air reacting with silver flatware to produce tarnish, or silver sulfide.

What is silver?. When a layer of tarnish covers the silver surface it prevents the sulfur in the air from reacting.

400
Containers A and B have equal volumes and both contain gases. At the same temperature, the pressure in container B is four times that of container A. What can you say about the number of gas molecules in containers A and B?
What is 'container B contains four times as many particles as does container A'?
400
How can the Tyndall effect be used to distinguish between a colloid and a solution? Why?
What is a beam of light? A beam of light is visible in a colloid but not in a solution. Dispersed colloid particles are large enough to scatter light. (Tyndall effect)
400
A reaction is endothermic and experiences an increase in order. Predict under what conditions would Gibbs Free Energy be negative.
What is at very high temperatures?
400
True or False. The magnitude of the equilibrium constant is always independent of temperature.
What is false?
500
A metal oxide reacts with water to produce a metal hydroxide. What additional information would you need to determine the percent yield of metal hydroxide from this reaction?
What is the mass of one substance in the reaction and the actual mass of metal hydroxide produced?
500
What volume of oxygen at 26 C and 102.5 kPa is required to burn 684 L of methane at 101 C and 107.5 kpa?
What is 1150 L?
500
A single celled animal lives in a fresh-water lake. The cell is transferred into ocean water. Does it stay the same, shrink, or burst? Explain.
What is shrink? The membrane of the cell acts as a semipermeable membrane. The fresh water inside the cell is more dilute than the ocean (salty solution) surrounding it. As a result, water flows out of the cell into the briny water.
500
On a hot day, you take a six pack of soda on a picnic, cooling it with ice. Each empty (aluminum) can weighs 12.5g and contains 12.0 oz of soda. The specific heat of aluminum is 0.902 J/gK; take that of soda to be 0.402 J/gK. How much heat must be absorbed fro the six-pack to lower the temperature from 25.0 C to 5.0 C?
What is 169 000 J? (169 kJ)
500
A reaction has the following experimental rate equation: Rate=k[A]2[B]. If the [A] is doubled and the [B] halved, what happens to the reaction rate?
What is double?