THIS IS JEOPARDY!

Up To And Including Energy Changes in

Chemical Reactions!

Energy Changes

Solutions Equilibrium IIEquilibriumReaction Kinetics

100 100 100100100

200 200 200200200

300 300 300300300

400 400 400400400

500 500 500500500

Energy Changes 100

If heat is written down in a chemical equation as a reactant, is the reaction endothermic or exothermic? Does the reaction have a positive or negative value of ΔH?

The reaction is endothermic, and it has a positive value of ΔH.

Energy Changes 200

Temperature is a measure of the average energy of a substance, while heat is actual energy moving from a warmer object to a

cooler object.

Explain the difference between heat and temperature.

Energy Changes 300

Which of the following is an endothermic change?

D. Ice melting requires the ice

to absorb energy.

a. Hot coffee cooling to room temperature

b. Steam condensing to water on a cold window

c. Frost forming on a windshield

d. Ice melting

Energy Changes 400

What is the first law of thermodynamics?

Energy cannot be created or destroyed – it can only change forms.

Energy Changes 500How would you solve the following problem

if it came up on a departmental exam?

Use Hess’ Law – all of the molecules are formed by reactions with their elements in their standard states.

Solutions 100

• This is what the abbreviation ppm stands for.

Parts per milion

Solutions 200

• When a solution has more solute in it than it is supposed to be able to hold at a given temperature, we call the solution ___________________.

Supersaturated

Solutions 300

• What is the key fact that allows for the derivation of the dilution equation, C1V1 = C2V2?

Before and after the dilution, the number of moles of solute are the same.

Solutions 400Daily Double

What is the mass of a 4.5% ethanol solution containing

0.6 g of ethanol?

13.3 grams

Solutions 500

HCl is added to a saturated solution of NaCl. Explain why NaCl precipitates out of the solution, using Le Chatelier’s Principle!

The solution contains a system of NaCl dissolving to form Na+ and Cl- at chemical

equilibrium. The adding of HCl is a stress that increases Cl-, and to offset it, NaCl is formed.

Reaction Kinetics 100

Is the reaction pictured in the diagram endothermic or exothermic? How can you tell?

Exothermic, energy of the products is lower than the energy of the reactants.

Reaction Kinetics 200

What is the transition state, or activated complex?

The transition state is the complex that exists between reactants and products, and

it has incredibly high energy and only lasts for a very short time.

Reaction Kinetics 300

According to the collision theory, what has to happen in order for two particles that collide to chemically react?

The particles must strike with enough energy, as well as with the proper orientation.

Reaction Kinetics 400

Catalysts increase the rate of a chemical reaction by decreasing the energy required for

an effective collision – in other words, they lower that energy hill.

What is the role of a catalyst in a chemical reaction? How does it affect

the energy of the transition state?

Reaction Kinetics 500

Imagine that you have a gaseous system that is reacting, but you can’t measure the concentration

of the chemicals involved. How else could you measure the speed of the reaction?

Measure the change in pressure of the system.

Equilibrium 100

Imagine that at chemical equilibrium, the rate of the forward reaction was greater than the rate of the reverse reaction. What would you say about that chemical equilibrium?

That’s impossible! At equilibrium, the rate of the forward reaction is ALWAYS equal to the

rate of the reverse reaction.

Equilibrium 200

When we are writing an equilibrium constant expression, what phases of matter do we leave out of it?

Solids and liquids.

Equilibrium 300A chemical equilibrium has a Keq value of approximately 5 x 1089. Which of the following is true?

a. The chemical reaction occurs very quicklyb. The reaction essentially goes to completion

c. There are virtually no products present at equilibriumd. The denominator of the equilibrium constant expression is very high

b. The reaction essentially goes to completion

Equilibrium 400

If you increase the pressure of a gaseous system, to which side of the chemical

equation will the equilibrium shift?

It will shift to the side with the fewest moles of gas.

Equilibrium 500Look at the following chemical reaction. Which of the following would NOT shift the position of

the equilibrium?H2O(l) + H2O(l) → H3O+

(aq) + OH-(aq)

a. Lowering concentration of OH-

b. Increasing volume of containerc. Increasing temperature

d. Adding a catalyst

Neither B or D will affect it – changing pressure only affects gases at equilibrium.

Equilibrium II 100

Imagine that you have a system that initially only has products in it. Initially, is the rate of the forward reaction faster or the reverse reaction faster?

The rate of the reverse reaction is faster – initially there are no reactants, so the forward

reaction can’t even occur.

Equilibrium 200

What is a steady-state process?

A process in which products are constantly removed and new

reactants are constantly added.

Equilibrium 300

What factor that shifts equilibrium also changes the value of the equilibrium constant?

Temperature

Equilibrium II 400Examine the following graph. Are the reactants or

products favoured at chemical equilibrium?

From what you are given, it is impossible to tell

Equilibrium II 500I wanted to put an I.C.E. box problem here, but decided that

would be hard to work out. What is the first step in solving an I.C.E. box problem if you know the concentrations of one chemical initially AND at equilibrium?

Calculate the changes in concentration of each species

based on the change in the one you know.

VeggieTales 100

Picture Daily Double

VeggieTales 100

• The name of the following character.

VeggieTales 200

• If you like to talk to tomatoes,• If a squash can make you _______.

VeggieTales 300

• The nationality of the green peas.

VeggieTales 400

• The name of the carrot on VeggieTales.

VeggieTales 500

Audio Daily Double

VeggieTales 500• The character who sings this song.

Double Jeopardy

Final Jeopardy

Your regular Sunday School Teacher.

Final Jeopardy

• The name of Jeff’s son.