Balancing Chemical Equations
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Questions and Answers

What is the oxidation state of aluminum in the compound Al(NO3)3?

  • +3 (correct)
  • +2
  • +5
  • +1
  • What type of reaction is the process: Mg + H2O —> Mg(OH)2 + H2 + 430 kJ?

  • neutral
  • exothermic (correct)
  • catalytic
  • endothermic
  • What is the role of zinc in the reaction: Zn(s) + HCl(aq) —> ZnCl2(aq) + H2(g)?

  • oxidizing agent
  • inert substance
  • reducing agent (correct)
  • catalyst
  • What is the oxidation number of bromine in the compound KBrO4?

    <p>+7</p> Signup and view all the answers

    How many moles of CO2 are produced in the reaction: C5H12O(g) + 8O2(g) → 5CO2(g) + 6H2O(g) if 2 moles of C5H12O react?

    <p>5 moles</p> Signup and view all the answers

    What is the correct balancing of the equation: NH4OH(aq) + Al(NO3)3(aq) → Al(OH)3(s) + NH4NO3(aq)?

    <p>2NH4OH(aq) + Al(NO3)3(aq) → Al(OH)3(s) + 2NH4NO3(aq)</p> Signup and view all the answers

    What is the oxidation state of Ag in the reactant side of the equation Al(NO3)3 (aq) + 3 Ag (s) → Al (s) + 3 AgNO3 (aq)?

    <p>0</p> Signup and view all the answers

    According to the activity series, which reaction will not occur as written?

    <p>Cu + MgCl2 → Mg + CuCl2</p> Signup and view all the answers

    What is the unit of energy of activation?

    <p>Kilojoules</p> Signup and view all the answers

    What is the molarity of 5.25 mL of a solution containing 0.00250 mole of CaCl2?

    <p>0.476 M</p> Signup and view all the answers

    What is the number of moles of CaCl2 in 15.00 mL of 0.123 M CaCl2 solution?

    <p>0.00185 mol</p> Signup and view all the answers

    What happens to the rate of reaction when the concentration of C is doubled, given the rate law rate = k [C]?

    <p>The rate doubles</p> Signup and view all the answers

    What is the correct equilibrium constant expression (Keq) for the reaction 2NO2 (g) 2NO (g) + O2 (g)?

    <p>Keq = [NO]^2 [O2] / [NO2]^2</p> Signup and view all the answers

    What is the concentration of Ba(OH)2 in the reaction 2 HBr + Ba(OH)2 → BaBr2 + 2 H2O?

    <p>0.350 M</p> Signup and view all the answers

    What is the ΔE for the reaction in the energy profile diagram?

    <p>72.3 kJ</p> Signup and view all the answers

    Which of the following reactions goes essentially to completion, based on the Keq value?

    <p>2 H2 (g) + O2 (g) 2 H2O (g) Keq = 3.0 x 10^81</p> Signup and view all the answers

    What is the effect of increasing the concentration of SO2 on the equilibrium 2SO2 (g) + O2 (g) 2SO3 (g) + heat?

    <p>The reaction shifts to the right</p> Signup and view all the answers

    What is the effect of adding a catalyst to the equilibrium reaction 2SO2 (g) + O2 (g) 2SO3 (g) + heat?

    <p>The reaction rate increases, but the equilibrium constant remains unchanged</p> Signup and view all the answers

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