CHEM 1212: Final Exam
24 Cards in this Set
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the value of an equilibrium contant can be used to predict _____
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direction of reaction, extent of reaction, and quantity of remaining reactants
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chemical equilibrium is the result of _____
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opposing reactions attaining equal speeds
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what factor affects both the position of equilibrium and the value of the equilibrium constant
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raising or lowering temp
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what change can cause an increase in the pressure of a certain product when equilibrium is reestablished
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increase in temp
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the numerical value of the equilibrium constant for any chemical change is affected by changing the _____
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temperature
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arrange S, Se, and Cl in order of increasing atomic radius
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Cl<S<Se
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arrange the elements Li, Ne, Na, and Ar in increasing order of the energy required to remove the first electron from their respective gaseous atoms
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Na<Li<Ar<Ne
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Which metal reacts with concentrated NaOH to produce hydrogen gas?
- aluminum
- copper
- iron
- magnesium
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aluminum
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which gas is the predominant nitrogen containing pollutant in the atmosphere
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NO2
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Helium is preferable to hydrogen for filling balloons because helium is _____
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chemically inert or it doesnt react with anything
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Transition metals have all of these characteristics except:
- forming colored compounds
- showing a variety of oxidation states
- having individual atoms with one or more unpaired electrons
- having low melting points in the elemental state
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have low melting points in elemental state
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the size of metal atoms:
- generally increases progressively from top to bottom in a group
- generally increases progressively from left to right in a period
- are smaller than those of the corresponding ions
- do not change upon losing electrons
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increase from top to bottom in a group
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which of these elements has the smallest atomic radius?
- Fluorine
- Chlorine
- Bromine
- Iodine
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fluorine
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Which of these atoms will be the smallest?
- Si (Z=14)
- P (Z=15)
- Ge (Z=32)
- As (Z=33)
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P (Z=15)
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the radii of Na+, Mg2+, and Al3+ decrease because _____
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the effective nuclear charge is increasing
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Arrange F-, Ne, and Na+ in decreasing size.
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F- > Ne > Na+
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which ion has the largest radius?
- Cl-
- F-
- K+
- Cu2+
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Cl-
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what is mass spectrometer used for?
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detect presence of isotopes
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all of these changes increase the value of the rate constant for a reaction except:
- decreasing the activation energy
- raising the temperature
- adding a catalyst
- increasing the concentration of reactants
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increasing concentration of reactants
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what will be the effect of increasing the temperature of reactants that are known to undergo an endothermic reaction?
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both rate of reaction and value of equilibrium constant increase
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The value for the rate constant of a reaction can generally be expected to ____ with increasing temp
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increase
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a catalyst increases the rate of a reaction by ____
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changing the mechanism of the reaction
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what is the relationship between the equilibrium constant and the rate constants for the forward and reverse reactions
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Kc = kf/kr
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if the half life of a reaction is independent of concentration, the reaction can be what order?
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only first
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CHEM 1212: Exam 1