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26 Cards in this Set
- Front
- Back
- 3rd side (hint)
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A process or reaction which releases heat to the surroundings is said to be
a) conservative b) exothermic c) endothermic d) isothermal e) endergonic |
b) exothermic
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All of the statements regarding the symbol "triangle"H are correct EXCEPT
a) It represents the difference between the energy used in breaking bonds and the energy released in forming bonds in a chemical reaction. b) It can be called heat of reaction. c) It can be called enthalpy change. d) It can be called entropy change. e) It has a negative value for an exothermic reaction |
d) It can be called entropy change.
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211
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5. Consider the reaction: C3H8 + 5 O2 3 CO2 + 4 H2O + 488 kcal We can say
that this reaction is _____ and that the sign of H is _____. a) endothermic; negative b) exothermic; negative c) endothermic; positive d) exothermic; positive e) exothermic; neither positive nor negative |
b) exothermic; negative
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Entropy can be defined as
a) the number of chemical bonds which are changed during a reaction. b) the amount of energy required to rearrange chemical bonds. c) the amount of energy required to initiate a reaction. d) the amount of randomness or disorder in a system. e) the state of equilibrium in a system. |
d) the amount of randomness or disorder in a system.
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Activation energy can best be described as
a) the energy level of the products. b) the energy level of the activated complex. c) the energy level of the reactants. d) the difference in energy between reactants and products. e) the difference in energy between reactants and the activated complex. |
e) the difference in energy between reactants and the activated complex.
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A rapid reaction is distinguished by
a) being unaffected by catalysts. b) having a large heat of reaction. c) having a small heat of reaction. d) having a large activation energy. e) having a small activation energy. |
e) having a small activation energy.
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Which factor(s) would increase the rate of a reaction?
I) increasing the temperature II) increasing the concentration of reactants III) adding a catalyst a) I & II only b) II & III only c) III only d) I & III only e) I, II, & III |
e) I, II, & III
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notes
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The function of a catalyst in a reaction is to
a) increase the yield of product. b) decrease the amount of heat produced. c) decrease the amount of energy consumed in the reaction. d) increase the rate of the reaction. e) decrease the amount of reactants consumed. |
d) increase the rate of the reaction.
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When a reaction system is at equilibrium
a) there is no more chemistry happening. b) the amounts of reactants and products are exactly equal. c) the reaction rate in the forward direction is at a maximum. d) the reaction rate in the reverse direction is at a minimum. e) the rates of the forward and reverse directions are exactly equal. |
e) the rates of the forward and reverse directions are exactly equal.
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Consider the reaction: CH4(g) + NH3(g) HCN(g) + 3 H2(g)
The equilibrium expression for this reaction is a) [CH4][NH3]/[HCN][H2]3 b) [HCN][H2]3/[ CH4][NH3] c) [HCN]3[H2] /[ CH4][NH3] d) [CH4][NH3]/[HCN][H2] e) [CH4][NH3]/[HCN]3[H2] |
b) [HCN][H2]3/[ CH4][NH3]
Products over/ reactants |
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. Consider the reaction: 2 SO2(g) + O2(g) 2 SO3(g) + heat Keq = 4.8 x 1027
Which statement about this system is NOT true? a) At equilibrium SO3 is the predominant substance. b) Heating the system will cause breakdown of SO3. c) Adding O2 will cause an increase in the amount of SO3. d) Removing SO2 will cause an increase in the amount of SO3. e) The large value of Keq means that the reaction essentially goes to completion. |
d) Removing SO2 will cause an increase in the amount of SO3.
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14.Consider the reaction: N2(g) + 3 H2(g) 2 NH3(g) + heat Which change to
this reaction system would cause the equilibrium to shift to the right? a) addition of catalyst b) addition of N2(g) c) addition of NH3(g) d) increasing the temperature e) none of these |
b) addition of N2(g)
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Which statement concerning Arrhenius acid-base theory is correct?
a) An Arrhenius acid produces hydrogen ions in water solution. b) An Arrhenius base produces hydroxide ions in water solution. c) A neutralization reaction produces water and a salt. d) Acid-base reactions must take place in aqueous solution. e) All of the above are correct. |
e) All of the above are correct.
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241
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A Bronsted-Lowry base is a substance which
a) produces hydrogen ions in aqueous solution. b) produces hydroxide ions in aqueous solution. c) donates protons to other substances. d) accepts protons from other substances. e) accepts hydronium ions from other substances. |
d) accepts protons from other substances.
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241
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What is the conjugate base of HPO42-?
a) H2PO41- b) H3PO4 c) H3O+ d) OH- e)PO4^3- |
Refer to conjugate table
e) PO4^3- |
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Water & HCO3- can either accept protons or donate protons. Such substances are said to be
a) conjugat b) amphoteric c) diprotic d) monoprotic e) triprotic |
b) amphoteric
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242
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Acetic acid is a weak acid in water because it _______.
a) is dilute b) is only slightly soluble c) unable to hold onto its hydrogen ion d) ionizes only slightly into hydronium ions and acetate ions e) ionizes completely into hydronium ions and acetate ions. |
d) ionizes only slightly into hydronium ions and acetate ions
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243
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If the [OH-] is 1 x 10^-4 M, the [H3O+] is _____ M.
a) 1 x 10^-4 b) 1 x 10^-14 c) 1 x 10^-7 d) 1 x 10^-12 e) 1 x 10^-10 |
e) 1 x 10^-10
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Which solution is basic?
a) [H3O+] = 1 x 10^-8 M b) [H3O+] = 1 x 10^-2 M c) [H3O+] = 1 x 10^-5 M d) [OH-] = 1 x 10^-9 M e) [OH-] = 1 x 10^-7 M |
a) [H3O+] = 1 x 10^-8 M
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. If the [H3O+] of a water sample is 1 x 10^-5 M, the pH of the sample is _____ and the
solution is _______ . a) 9; basic b) 9; acidic c) 5; acidic d) 5; basic e) –5; acidic |
c) 5; acidic
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A buffer solution ________.
a) is a weak acid b) maintains a pH at 7.0 c) is a strong base d) neutralizes only acids e) acts to prevent a drastic change in pH |
E
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G-3
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Use LeChatelier's Principle to predict the effect on the equilibrium (will it shift to the left, right, or will there be no change) for each of the following? REMEMBER THIS
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Use up what ever is added.
Replace what ever you remove. Catalyst cause no change. |
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For pH remember
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[H3O+][OH-]= 1 x 10^-14
[H3O+] is hydronium, when given to find pH take -Log of hydronium for pH. [OH-] is the hydroxide, plug in to find hydronium than find pH. |
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What causes Normal Rain?
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Carbon dioxide and water in the atmosphere.
Normal rain pH is 5.6 |
256-257
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What causes Acid Rain?
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The combustion of fossil fuel from gas, coal, oil, in cars, power plants etc. reacting with normal rain, carbon dioxide and water to produce acid rain.
Acid rain pH is 1.5 to 5.5 |
256-257
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Effects of Acid Rain
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Destroying life in bodies of water (lakes, rivers, etc).
Decreasing pH of soil decreasing the ability for plants to absorb food/minerals. Corrosive to solids over time. Resp. problems to people with asthma or lung disease. |
256-257
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