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CHEM 1212: Final Exam
the value of an equilibrium contant can be used to predict _____ |
direction of reaction, extent of reaction, and quantity of remaining reactants |
chemical equilibrium is the result of _____ |
opposing reactions attaining equal speeds |
what factor affects both the position of equilibrium and the value of the equilibrium constant |
raising or lowering temp |
what change can cause an increase in the pressure of a certain product when equilibrium is reestablished |
increase in temp |
the numerical value of the equilibrium constant for any chemical change is affected by changing the _____ |
temperature |
arrange S, Se, and Cl in order of increasing atomic radius |
Cl<S<Se |
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 |
Na<Li<Ar<Ne
|
Which metal reacts with concentrated NaOH to produce hydrogen gas?
- aluminum
- copper
- iron
- magnesium |
aluminum
|
which gas is the predominant nitrogen containing pollutant in the atmosphere |
NO2 |
Helium is preferable to hydrogen for filling balloons because helium is _____ |
chemically inert or it doesnt react with anything |
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
|
have low melting points in elemental state |
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
|
increase from top to bottom in a group |
which of these elements has the smallest atomic radius?
- Fluorine
- Chlorine
- Bromine
- Iodine |
fluorine |
Which of these atoms will be the smallest?
- Si (Z=14)
- P (Z=15)
- Ge (Z=32)
- As (Z=33) |
P (Z=15) |
the radii of Na+, Mg2+, and Al3+ decrease because _____ |
the effective nuclear charge is increasing |
Arrange F-, Ne, and Na+ in decreasing size. |
F- > Ne > Na+ |
which ion has the largest radius?
- Cl-
- F-
- K+
- Cu2+ |
Cl- |
what is mass spectrometer used for? |
detect presence of isotopes |
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
|
increasing concentration of reactants |
what will be the effect of increasing the temperature of reactants that are known to undergo an endothermic reaction? |
both rate of reaction and value of equilibrium constant increase |
The value for the rate constant of a reaction can generally be expected to ____ with increasing temp |
increase |
a catalyst increases the rate of a reaction by ____ |
changing the mechanism of the reaction |
what is the relationship between the equilibrium constant and the rate constants for the forward and reverse reactions |
Kc = kf/kr |
if the half life of a reaction is independent of concentration, the reaction can be what order? |
only first |