General Chemistry 2 - First Semester (2nd Quarter)
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Questions and Answers

Which of the following is true about the concentration of [A]₂ in experiment 3 compared to experiment 1?

  • The concentration of [A]₂ in experiment 3 is four times that in experiment 1. (correct)
  • The concentration of [A]₂ in experiment 3 is the same as that in experiment 1.
  • The concentration of [A]₂ in experiment 3 is half of that in experiment 1.
  • The concentration of [A]₂ in experiment 3 is one-third of that in experiment 1.

    • What is the value of x in the formula Rate = k [A]x[B]y?

  • 1
  • 3
  • 2 (correct)
  • 4

    • What is the value of y in the formula Rate = k [A]x[B]y?

  • 3
  • 2
  • 0
  • 1 (correct)

    • What is the value of k in the formula Rate = k [A]x[B]y?

    <p>2.5x10⁶ M-²/min</p> Signup and view all the answers

    Which of the following is NOT an observable property that can be used to determine the rate of a reaction?

    <p>Change in activation energy</p> Signup and view all the answers

    Which of the following is true about the initial rate of [A]₁ in experiment 3 compared to experiment 1?

    <p>The initial rate of [A]₁ in experiment 3 is 4 times higher than in experiment 1.</p> Signup and view all the answers

    Which of the following is true about the concentration of [B]₃ in experiment 3 compared to experiment 1?

    <p>The concentration of [B]₃ in experiment 3 is 3 times higher than in experiment 1.</p> Signup and view all the answers

    Which of the following is the correct formula for the rate of reaction?

    <p>Rate = k [A]²[B]</p> Signup and view all the answers

    Which of the following is true about the activation energy?

    <p>Activation energy is the energy required to activate a reaction.</p> Signup and view all the answers

    Which of the following is NOT an example of an observable property that can be used to determine the rate of a reaction?

    <p>Change in intensity of the color of the reactant</p> Signup and view all the answers

    Which of the following is true about the initial rate of [A]₁ in experiment 3 compared to experiment 2?

    <p>The initial rate of [A]₁ in experiment 3 is three times greater than in experiment 2.</p> Signup and view all the answers

    Which of the following is true about the initial rate of [B]₁ in experiment 3 compared to experiment 2?

    <p>The initial rate of [B]₁ in experiment 3 is twice as great as in experiment 2.</p> Signup and view all the answers

    What is the value of k in the formula Rate = k [A]x[B]y?

    <p>$2.5x10^6$ M-²/min</p> Signup and view all the answers

    What is the value of x in the formula Rate = k [A]x[B]y?

    <p>2</p> Signup and view all the answers

    What is the value of y in the formula Rate = k [A]x[B]y?

    <p>1</p> Signup and view all the answers

    Which equation can be used to calculate the change in entropy (ΔS) of a reaction?

    <p>ΔS = Σ[n(ΔS)]products - Σ[n(ΔS)]reactants</p> Signup and view all the answers

    Which of the following statements is true about the sign of ΔS in a spontaneous process?

    <p>ΔS is positive</p> Signup and view all the answers

    Which equation can be used to calculate the change in Gibbs free energy (ΔG) of a reaction?

    <p>ΔG = Σ(ΔG)products - Σ(ΔG)reactants</p> Signup and view all the answers

    What is the change in Gibbs free energy (ΔG) of the reaction CO(g) + H₂O(g) --> CO₂(g) + H₂(g) at 25°C?

    <p>-28.6 kJ</p> Signup and view all the answers

    Is the reaction CO(g) + H₂O(g) --> CO₂(g) + H₂(g) spontaneous at 2000 K?

    <p>No</p> Signup and view all the answers

    Which equation can be used to calculate the change in entropy (ΔS) of a reaction?

    <p>ΔS = Σ[n(ΔS)]products - Σ[n(ΔS)]reactants</p> Signup and view all the answers

    Which of the following is true about the sign of ΔS in a spontaneous process?

    <p>ΔS is positive</p> Signup and view all the answers

    What is the value of ΔG°reaction for the reaction CO(g) + H₂O(g) --> CO₂(g) + H₂(g)?

    <p>-28.6 kJ</p> Signup and view all the answers

    What is the value of ΔH for the reaction CO(g) + H₂O(g) --> CO₂(g) + H₂(g)?

    <p>-41.17 kJ</p> Signup and view all the answers

    Is the reaction CO(g) + H₂O(g) --> CO₂(g) + H₂(g) spontaneous at 2000 K?

    <p>No</p> Signup and view all the answers

    Which equation can be used to calculate the change in Gibbs free energy ((\Delta G)) of a reaction?

    <p>(\Delta G = \Delta H - T\Delta S)</p> Signup and view all the answers

    What is the value of (\Delta G^{\circ}_{\text{reaction}}) for the reaction CO(g) + H₂O(g) --> CO₂(g) + H₂(g)?

    <p>-28.6 kJ</p> Signup and view all the answers

    Which of the following is NOT an observable property that can be used to determine the rate of a reaction?

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

    Which of the following is true about the sign of (\Delta S) in a spontaneous process?

    <p>The sign of (\Delta S) depends on the specific process</p> Signup and view all the answers

    What is the value of (\Delta H) for the reaction CO(g) + H₂O(g) --> CO₂(g) + H₂(g)?

    <p>-41.17 kJ</p> Signup and view all the answers

    Which of the following is true about equilibrium?

    <p>Equilibrium is the state where the concentration ratio of the products to the reactant is constant.</p> Signup and view all the answers

    Which of the following is true about dynamic equilibrium?

    <p>Dynamic equilibrium exists if the opposing reactions occur continuously until an external force is applied to stop the reactions.</p> Signup and view all the answers

    Which of the following is true about Le Chatelier’s principle?

    <p>Le Chatelier’s principle states that when a chemical in equilibrium is disturbed, it reacts toward the direction of the reaction that will lead the system toward re-attainment of equilibrium.</p> Signup and view all the answers

    Which of the following is true about the equilibrium constant, K?

    <p>The value of the equilibrium constant, K, indicates the extent to which a reaction proceeds completion.</p> Signup and view all the answers

    Which of the following is true about a system in equilibrium?

    <p>For a system in equilibrium at any given temperature, the concentration ratio of products to reactants is constant.</p> Signup and view all the answers

    Which of the following is true about equilibrium?

    <p>Equilibrium is the state where the concentration ratio of the products to the reactant is constant.</p> Signup and view all the answers

    Which of the following is true about dynamic equilibrium?

    <p>Dynamic equilibrium exists if the opposing reactions occur continuously until an external force is applied to stop the reactions.</p> Signup and view all the answers

    Which of the following is true about Le Chatelier’s principle?

    <p>Le Chatelier’s principle states that when a chemical in equilibrium is disturbed, it reacts toward the direction of the reaction that will lead the system toward re-attainment of equilibrium.</p> Signup and view all the answers

    Which of the following is true about the value of the equilibrium constant, K?

    <p>The value of the equilibrium constant, K, indicates the concentration ratio of the products to the reactants at equilibrium.</p> Signup and view all the answers

    Which of the following is true about a system in equilibrium?

    <p>A system is in equilibrium when the rates of the forward and backward reactions are equal.</p> Signup and view all the answers

    Which of the following is true about the equilibrium constant, K?

    <p>K is constant for a given reaction at a specific temperature</p> Signup and view all the answers

    Which of the following is true about dynamic equilibrium?

    <p>Dynamic equilibrium is the state where the concentration ratio of the products to the reactants is constant</p> Signup and view all the answers

    Which of the following is true about Le Chatelier’s principle?

    <p>Le Chatelier’s principle states that when a chemical in equilibrium is disturbed, it reacts toward the direction of the reaction that will lead the system toward re-attainment of equilibrium</p> Signup and view all the answers

    Which of the following is true about a system in equilibrium?

    <p>A system is in equilibrium when the rates of the forward and backward reactions are equal</p> Signup and view all the answers

    Which of the following is true about the value of the equilibrium constant, K?

    <p>The value of K is constant for a given reaction at a specific temperature</p> Signup and view all the answers

    Which of the following is true about the strength of an acid and its conjugate base?

    <p>The strength of an acid and its conjugate base are inversely proportional.</p> Signup and view all the answers

    What is the relationship between Ka and Kb?

    <p>Ka and Kb are inversely proportional.</p> Signup and view all the answers

    What is the equation for the ionization of a weak monoprotic acid, HA?

    <p>HA + H2O(l) -&gt; H3O+(aq) + A-</p> Signup and view all the answers

    What is the formula for calculating the value of Ka for a weak acid?

    <p>Ka = [H3O+] / [HA]</p> Signup and view all the answers

    What is the formula for calculating the value of pKa for a weak acid?

    <p>pKa = -log[Ka]</p> Signup and view all the answers

    Which of the following is true about the ionization constant, Ka, for a weak acid?

    <p>Ka is a measure of the strength of a weak acid</p> Signup and view all the answers

    Which of the following is true about the ionization constant, Kb, for a weak base?

    <p>Kb is a measure of the strength of a weak base</p> Signup and view all the answers

    Which of the following is true about the relationship between Ka and Kb?

    <p>Ka and Kb are inversely proportional</p> Signup and view all the answers

    Which of the following is true about the pH scale?

    <p>pH is the negative logarithm of the hydrogen ion concentration</p> Signup and view all the answers

    Which of the following is true about buffers?

    <p>Buffers can resist changes in pH</p> Signup and view all the answers

    Which of the following is true about the strength of a weak acid and its conjugate base?

    <p>The strength of a weak acid is less than its conjugate base.</p> Signup and view all the answers

    What is the formula for calculating the value of Ka for a weak acid?

    <p>Ka = [H₃O⁺][HA]/[A⁻]</p> Signup and view all the answers

    What is the relationship between Ka and Kb?

    <p>Ka and Kb are inversely proportional.</p> Signup and view all the answers

    Which of the following is true about buffers?

    <p>Buffers consist of an acid and a base that differ by the presence or absence of a proton.</p> Signup and view all the answers

    What is the equation for the ionization of a weak monoprotic acid, HA?

    <p>HA + H₂O(l) ⇌ H₃O⁺(aq) + A⁻</p> Signup and view all the answers

    Which of the following ions is insoluble in water?

    <p>Cu²⁺</p> Signup and view all the answers

    What is the isoelectric point (pI)?

    <p>The pH at which a molecule carries no net electric charge.</p> Signup and view all the answers

    What happens to a protein below its isoelectric point (pI)?

    <p>It carries a net positive charge.</p> Signup and view all the answers

    What is the technique called when proteins are separated based on their isoelectric point?

    <p>Isoelectric focusing</p> Signup and view all the answers

    What happens to a protein when it reaches its isoelectric point (pI) during isoelectric focusing?

    <p>It carries no net electric charge and stops moving.</p> Signup and view all the answers

    Which of the following ions is insoluble in water?

    <p>Cu²⁺</p> Signup and view all the answers

    What is the isoelectric point (pI)?

    <p>The pH at which the net charge is neutral.</p> Signup and view all the answers

    What happens to a protein below its isoelectric point (pI)?

    <p>It carries a net positive charge.</p> Signup and view all the answers

    Which equation can be used to calculate the change in Gibbs free energy ((\Delta G)) of a reaction?

    <p>(\Delta G = \Delta H - T \Delta S)</p> Signup and view all the answers

    Which of the following is true about buffers?

    <p>Buffers resist changes in pH.</p> Signup and view all the answers

    Which of the following is true about the solubility of copper carbonate (CuCO₃)?

    <p>Copper carbonate is insoluble in water.</p> Signup and view all the answers

    Which of the following ions is soluble in water?

    <p>Cl⁻</p> Signup and view all the answers

    What is the isoelectric point (pI)?

    <p>The pH at which a solute carries no net electric charge.</p> Signup and view all the answers

    What is the technique called when proteins are separated based on their isoelectric point?

    <p>Isoelectric focusing</p> Signup and view all the answers

    Which of the following ions are soluble carbonates?

    <p>K⁺, Na⁺, NH₄⁺</p> Signup and view all the answers

    Which of the following ions is insoluble in water?

    <p>Cu²⁺</p> Signup and view all the answers

    What is the isoelectric point (pI)?

    <p>The pH at which the net charge of a molecule is neutral.</p> Signup and view all the answers

    What happens to a protein below its isoelectric point (pI)?

    <p>It carries a net negative charge.</p> Signup and view all the answers

    What happens to a protein when it reaches its isoelectric point (pI) during isoelectric focusing?

    <p>It becomes focused into sharp stationary bands.</p> Signup and view all the answers

    Which of the following ions are soluble carbonates?

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

    Which of the following ions is insoluble in water?

    <p>Cu²⁺</p> Signup and view all the answers

    What is the technique called when proteins are separated based on their isoelectric point?

    <p>Isoelectric focusing</p> Signup and view all the answers

    At what pH does a protein carry no net electric charge?

    <p>pH equal to the protein’s pI</p> Signup and view all the answers

    What happens to a protein below its isoelectric point (pI)?

    <p>It carries a net positive charge</p> Signup and view all the answers

    Which of the following is true about the solubility of copper carbonate (CuCO₃)?

    <p>It is insoluble in water</p> Signup and view all the answers

    Which of the following ions is soluble in water?

    <p>Cl⁻</p> Signup and view all the answers

    What is the technique called when proteins are separated based on their isoelectric point?

    <p>Isoelectric focusing</p> Signup and view all the answers

    What happens to a protein below its isoelectric point (pI)?

    <p>It carries a net negative charge</p> Signup and view all the answers

    Which of the following is true about the solubility of copper carbonate (CuCO₃)?

    <p>It precipitates out of the solution</p> Signup and view all the answers

    What is the isoelectric point (pI)?

    <p>The pH at which a molecule carries no net electric charge</p> Signup and view all the answers

    Which of the following ions is soluble in water according to the text?

    <p>Cl⁻</p> Signup and view all the answers

    What is the balanced chemical equation for the reaction between Cu²⁺, CO₃²⁻, Cl⁻, and Na⁺?

    <p>2Na⁺ + Cu²⁺ + CO₃²⁻ + Cl⁻ → CuCO₃ + 2Na⁺ + 2Cl⁻</p> Signup and view all the answers

    What is the pH at which a solute often has minimal solubility and precipitates out of the solution called?

    <p>Isoelectric point</p> Signup and view all the answers

    What technique is used to separate proteins based on their isoelectric point?

    <p>Isoelectric focusing</p> Signup and view all the answers

    What happens to a protein when it reaches its isoelectric point during isoelectric focusing?

    <p>It stops moving in the gel</p> Signup and view all the answers

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