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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
Potential Energy Graph - 100
Where is the location on the activated complex on this graph?
Back
The Answer is the top of the hump.
Potential Energy Graph - 200
• What is the energy of the products?
The Answer is 100 J.Back
Potential Energy Graph - 300
• What is the energy needed to break the chemical bonds?
The Answer is 100 J.Back
Potential Energy Graph - 400
• What is the net energy of this reaction?
The answer is -200 JBack
Daily Double
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
Reaction Rates - 200
At equilibrium, the forward reaction rate is _____________ to the reverse reaction rate.
The Answer is equalBack
Reaction Rates - 300
• The role of a catalyst is to affect ________________.
•The Answer is activation energy. Back
Daily Double
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
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
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
Random Points100 Points
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
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
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
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
Random Points300 Points
[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
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
Definitions – 100
The Answer is reversible reaction.
• A chemical reaction in which the products re-form the original reactants
Back
Random Points500 Points
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
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
Definitions – 400
• The minimum amount of energy required to start a chemical reaction.
The Answer is activation energy. Back
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
Properties - 100
• Acids taste __________________.
Back
The Answer is sour, or any word that means sour.
Properties - 200
• If a base was touched, it would feel ____________________.
Back
The Answer is slippery.
Properties - 300
• Strong acids are ______________ electrolytes.
Back
The Answer is strong.
Properties - 400
• Strong acids ______________ ionize when added to water.
Back
The Answer is completely.
Identify the Acid or Base - 100
Whose definition of acids and bases emphasizes the role of protons?
Back
The Answer is Brønsted-Lowry
Random Points300 Points
Identify the Acid or Base - 200
• An Arrhenius Acid increases the _____________ concentration.
Back
The Answer is hydronium.
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.
Daily Double
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
pH - 100
• What is the pH of a neutral solution at 25°C?
Back
The Answer is 7.
Random Points500 Points
pH - 200
The pH of a solution is 8. What is its H3O+ concentration?
Back
The Answer is 1x 10-8
pH - 300
• What is the pH of a 1 x 10-3 M KOH solution?
Back
•The Answer is 11.
pH - 400
• What is the pH of a 0.00870 M KOH solution?
Back
The Answer is 11.9.
Kw and Ka– 100
• What is the value of the self-ionization constant of water?
Back
The Answer is 1 x 10-14
Kw and Ka– 200
• What is the equilibrium expression (Kw) for the self-ionization of water?
Back
The Answer is Kw=[OH-][H3O+]
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]
Daily Double
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
Titrations - 100
• During a titration the volume of the titrant is measured with a(n) ____________________.
Back
The Answer is buret or burette
Titrations - 200
• What unknown quantity can be calculated after performing a titration?
Back
The Answer is concentration or volume.
Titrations - 300
• During a titration, the indicator _________________________ is used to study neutralizations of weak acids with strong bases.
Back
The Answer is phenolphthalein.
Daily Double
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
Definitions – 100
Back
The Answer is transition range.
• The pH range over which an indicator changes color is its _________ _________.
Definitions – 200
• A(n) ____________________ solution resists changes in pH.
Back
The Answer is buffer.
Random Points200 Points
Definitions – 300
• A _____________ ________ is the species that remains after an acid has given up a proton.
Back
The Answer is conjugate base.
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
The Final Question
• The final question has to deal with:
»Indicators
Make your wager and hand it to the teacher
• 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
And the Answer is:
The Answer is Bromthymol blue, yellow, blueandPhenol Red, yellow, red