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Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelie r's Principl e Definitions 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 Round Two

Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

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Page 1: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Choose Your Category

Potential Energy Graph

Reaction Rates

Keq and KspLe

Châtelier's Principle

Definitions

100 100 100 100 100

200 200 200 200 200

300 300 300 300 300

400 400 400 400 400

Round Two

Page 2: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Potential Energy Graph - 100

Where is the location on the activated complex on this graph?

Back

The Answer is the top of the hump.

Page 3: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Potential Energy Graph - 200

• What is the energy of the products?

The Answer is 100 J.Back

Page 4: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Potential Energy Graph - 300

• What is the energy needed to break the chemical bonds?

The Answer is 100 J.Back

Page 5: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Potential Energy Graph - 400

• What is the net energy of this reaction?

The answer is -200 JBack

Page 6: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Daily Double

Page 7: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Reaction Rates - 100• Calcium carbonate was placed in

a flask on a balance, and dilute hydrochloric acid was added. Carbon dioxide that was produced escaped from the flask. The total mass of the flask and its contents was recorded every 10 seconds. The diagram to the right shows a plot of the results. Between which two times shown was the reaction the fastest?

The Answer is 0-10 seconds.

Back

Page 8: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Reaction Rates - 200

At equilibrium, the forward reaction rate is _____________ to the reverse reaction rate.

The Answer is equalBack

Page 9: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Reaction Rates - 300

• The role of a catalyst is to affect ________________.

•The Answer is activation energy. Back

Page 10: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Daily Double

Page 11: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Reaction Rates - 400

• Name three factors that can influence the rate of a reaction.

The Answer is any three of the following:concentration of the reactantstemperaturesurface areapressurecatalysts

Back

Page 12: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Keq and Ksp – 100

• What is ksp for the dissociation of NaCl in water?

NaCl (s) + H2O (l) Na+ (aq) + Cl- (aq)

The Answer is [Na+][Cl-]

Back

Page 13: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Keq and Ksp – 200

• What is the equilibrium expression (Keq) for the following reaction?CaCOCaCO33(s) + 2H(s) + 2H33OO++(aq)(aq) Ca Ca2+2+(aq) + CO(aq) + CO22(g) + 3H(g) + 3H22O(l)O(l)

The Answer is Keq=[Ca2+][CO2]

[H3O+]2 Back

Page 14: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Random Points100 Points

Page 15: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Keq and Ksp – 300

• A very low value of the equilibrium constant for a reaction can indicate that

A) products are favored

B) equilibrium is reached slowly

C) Reactants are favored

D) equilibrium is reached quickly

The Answer is C. Back

Page 16: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Keq and Ksp – 400

• What is the solubility in mol/L of silver iodide, AgI? Its Ksp value is 8.3 x 10-17 and the equation is AgI (s) Ag+1(aq) + I-1(aq).

The Answer is 9.11 x 10-9Back

Page 17: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Le Châtelier's Principle - 100

[Ni(H2O)6]+2 + 6NH3 [Ni(NH3)6]+2 + 6H2O (endothermic)

green blue-violet

• What color would you expect the above solution to be if NH3 is added? (Green, blue-violet or no change)

The Answer is blue-violet Back

Page 18: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Le Châtelier's Principle - 200

[Ni(H2O)6]+2 + 6NH3 [Ni(NH3)6]+2 + 6H2O (endothermic)

green blue-violet

• What color would you expect the above solution to be if water is removed? (Green, blue-violet or no change)

The Answer is blue-violet. Back

Page 19: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Random Points300 Points

Page 20: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

[Ni(H2O)6]+2 + 6NH3 [Ni(NH3)6]+2 + 6H2O (endothermic)

green blue-violet

• What color would you expect the above solution to be if NaBr is added? (Green, blue-violet or no change)

Le Châtelier's Principle - 300

The Answer is no change. Back

Page 21: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

The Answer is blue-violet

Le Châtelier's Principle - 400

[Ni(H2O)6]+2 + 6NH3 [Ni(NH3)6]+2 + 6H2O (endothermic)

green blue-violet

• What color would you expect the above solution to be if the solution is heated? (Green, blue-violet or no change)

Back

Page 22: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Definitions – 100

The Answer is reversible reaction.

• A chemical reaction in which the products re-form the original reactants

Back

Page 23: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Random Points500 Points

Page 24: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Definitions – 200

• A state of balance in which the rate of a forward reaction equals the rate of the reverse reaction and the concentrations of substances do not change

The Answer is equilibrium. Back

Page 25: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Definitions – 300

• A type of protein that speeds up metabolic reactions in plant and animals without being permanently changed or destroyed

The Answer is an enzyme. Back

Page 26: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Definitions – 400

• The minimum amount of energy required to start a chemical reaction.

The Answer is activation energy. Back

Page 27: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Choose Your CategoryProperties Identify the

Acid or BasepH Kw and Ka Titrations Definitions

100 100 100 100 100 100

200 200 200 200 200 200

300 300 300 300 300 300

400 400 400 400 400 400

The Final Question

Page 28: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Properties - 100

• Acids taste __________________.

Back

The Answer is sour, or any word that means sour.

Page 29: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Properties - 200

• If a base was touched, it would feel ____________________.

Back

The Answer is slippery.

Page 30: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Properties - 300

• Strong acids are ______________ electrolytes.

Back

The Answer is strong.

Page 31: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Properties - 400

• Strong acids ______________ ionize when added to water.

Back

The Answer is completely.

Page 32: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Identify the Acid or Base - 100

Whose definition of acids and bases emphasizes the role of protons?

Back

The Answer is Brønsted-Lowry

Page 33: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Random Points300 Points

Page 34: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Identify the Acid or Base - 200

• An Arrhenius Acid increases the _____________ concentration.

Back

The Answer is hydronium.

Page 35: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Identify the Acid or Base - 300

• In the reaction H3PO4 + H2O H3O+ + H2PO4

-, the ion H2PO4- acts as a(n)

___________________.

Back

The Answer is base.

Page 36: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Daily Double

Page 37: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Identify the Acid or Base - 400

• Label the acid, base, conjugate acid, and conjugate base in the equation:

• HCl(g) + H2O(l) H3O+(aq) + Cl-

(aq)

Back

acid base conj acid conj base

Page 38: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

pH - 100

• What is the pH of a neutral solution at 25°C?

Back

The Answer is 7.

Page 39: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Random Points500 Points

Page 40: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

pH - 200

The pH of a solution is 8. What is its H3O+ concentration?

Back

The Answer is 1x 10-8

Page 41: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

pH - 300

• What is the pH of a 1 x 10-3 M KOH solution?

Back

•The Answer is 11.

Page 42: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

pH - 400

• What is the pH of a 0.00870 M KOH solution?

Back

The Answer is 11.9.

Page 43: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Kw and Ka– 100

• What is the value of the self-ionization constant of water?

Back

The Answer is 1 x 10-14

Page 44: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Kw and Ka– 200

• What is the equilibrium expression (Kw) for the self-ionization of water?

Back

The Answer is Kw=[OH-][H3O+]

Page 45: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Kw and Ka– 300

• What is the acid-ionization constant, Ka, for the ionization of acetic acid, shown in the reaction

• CH3COOH(aq) + H2O(l) H3O+(aq) + CH3COO–(aq)?

Back

The Answer is

[H3O+][CH3COO-]/[CH3COOH]

Page 46: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Daily Double

Page 47: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Kw and Ka– 400

• A 0.845 M sample of carbonic acid, H2CO3, has a measured hydronium ion concentration of 5.36 x 10–3 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is

• H2CO3(aq)_+ H2O (l) H3O+ (aq) + HCO3-(aq)

BackThe Answer is 3.4 x 10-5

Page 48: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Titrations - 100

• During a titration the volume of the titrant is measured with a(n) ____________________.

Back

The Answer is buret or burette

Page 49: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Titrations - 200

• What unknown quantity can be calculated after performing a titration?

Back

The Answer is concentration or volume.

Page 50: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Titrations - 300

• During a titration, the indicator _________________________ is used to study neutralizations of weak acids with strong bases.

Back

The Answer is phenolphthalein.

Page 51: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Daily Double

Page 52: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

The Answer is 0.0338

Titrations - 400

• Calculate the molarity of a Ba(OH)2 solution if 1950 mL is completely titrated by 261 mL of 0.505 M HNO3.

• Ba(OH)2 + 2HNO3 Ba(NO3)2 + 2H2O

Back

Page 53: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Definitions – 100

Back

The Answer is transition range.

• The pH range over which an indicator changes color is its _________ _________.

Page 54: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Definitions – 200

• A(n) ____________________ solution resists changes in pH.

Back

The Answer is buffer.

Page 55: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Random Points200 Points

Page 56: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Definitions – 300

• A _____________ ________ is the species that remains after an acid has given up a proton.

Back

The Answer is conjugate base.

Page 57: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

Definitions – 400

• Water is an example of a(n) _______________________, something that can act as a base or an acid.

Back

The Answer is amphoteric species

Page 58: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

The Final Question

• The final question has to deal with:

»Indicators

Make your wager and hand it to the teacher

Page 59: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

• What indicator(s) would be the best choice for a titration with an equivalence point at a pH of 7.0?

• What color would the solution start?• What color would the solution be after the titration is over?

Indicator Acid Color

pH Transition Range

Base Color

Thymol Blue red 1.2 - 2.8 yellow

Bromphenol blue yellow 3.0 - 4.6 blue

Bromcresol green yellow 2.0 - 5.6 blue

Bromthymol blue yellow 6.0 - 7.6 blue

Phenol Red yellow 6.6 - 8.0 red

Alizarin yellow yellow 10.1 - 12.0 red

Page 60: Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

And the Answer is:

The Answer is Bromthymol blue, yellow, blueandPhenol Red, yellow, red