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Equilibrium (paper 1 style questions)

Emine Afiyet Fra 14 Fragen 4,0 (1 Bewertung)

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  1. 1Which statement is true about chemical reactions at equilibrium?
    1. AThe forward and backward reactions proceed at equal rates
    2. BThe forward and backward reactions have stopped
    3. CThe concentrations of the reactants and products are equal
    4. DThe forward reaction is exothermic
  2. 2Chemical equilibrium is referred to as dynamic because, at equilibrium, the...
    1. Aequilibrium constant changes
    2. Breactants and products keep reacting
    3. Crates of the forward and backward reactions change
    4. Dconcentrations of the reactants and products continue to change
  3. 3What is the equilibrium expression for the reaction: N2 + 3H2 --> 2NH3 (all in the gaseous state)?
    1. A[NH3]^2/[N2][H2]^3
    2. B2[NH3]/3[N2][H2]
    3. C[NH3]/[N2][H2]
    4. D2[NH3]/[N2][H2]
  4. 4For a reaction which goes to completion, the equilibrium constant, Kc, is:
    1. Amore than 1 (Kc >>1)
    2. Bless than 1 (Kc
    3. C= 1
    4. D= 0
  5. 5The equilibrium constant for the reaction below is 1.0 x 10^-14 at 25oC and 2.1 x 10^-14 at 35oC. What can be concluded from this information?
    2H2O (l) H3O+ (aq) + OH- (aq)
    1. AThe ionization of water is endothermic
    2. B[H3O+] decreases as the temperature is raised
    3. CWater is a stronger electrolyte at 25oC
    4. D[H3O+] is greater than [OH+] at 35oC
  6. 6Ethanol is manufactured from ethene using the reaction:
    C2H4 + H2O C2H5OH (Delta-H = -46 KJ)
    Which conditions favour the highest yield of ethanol?
    1. AHigh pressure and low temperature
    2. BHigh pressure and high temperature
    3. CLow pressure and low temperature
    4. DLow pressure and high temperature
  7. 7N2O4 and NO2 produce an equilibrium mixture according to the equation:
    N2O4 2NO2 (Delta-H = 57.2 KJ/mol)
    An increase in the equilibrium concentration of NO2 can be produced by increasing which of the factors below?
    1) Pressure 2) Temperature
    1. A1 only
    2. B2 only
    3. Cboth 1 and 2
    4. Dneither 1 or 2
  8. 8Which changes will increase the amount of SO3 (g) at equilibrium?
    2SO2 + O2 2SO3 (Delta-H = -197KJ)
    1) increasing temperature 2) decreasing volume 3) adding a catalyst
    1. A1 only
    2. B2 only
    3. C1 and 3 only
    4. D1, 2 and 3
  9. 9For the reaction N2 + 3H2 2NH3 (Delta-H = -92 KJ)
    What conditions will produce the highest percentage of NH3 at equilibrium?
    1. AHigh pressure and high temperature
    2. BHigh pressure and low temperature
    3. CLow pressure and high temperature
    4. DLow pressure and low temperature
  10. 10Hydrogen and iodine react in a closed vessel to form hydrogen iodide.
    H2 + I2 2HI
    at 350oC, Kc = 60
    at 445oC, Kc = 47
    1. AIncreased temperature as the forward reaction is exothermic, and increased pressure as there are two gaseous reactants and only one gaseous product
    2. BIncreased temperature as the forward reaction is endothermic, and pressure has no effect as there are equal amounts, in mol, of gaseous reactants and products
    3. CDecreased temperature as the forward reaction is exothermic, and decreased pressure as there are 2 moles of gaseous product but only 1 mole of each gaseous reactant
    4. DDecreased temperature as the forward reaction is exothermic, and pressure has no effect as there are equal amounts, in mol, of gaseous reactants and products

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Beschreibung
International baccalaureate Chemistry (Equilibrium) Quiz am Equilibrium (paper 1 style questions), erstellt von Emine Afiyet Fra am 15/09/2013.
Sprache
English
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375
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4,0 von 5 · 1 Bewertung
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