A LevelChemistryOCRExam Questions1. Development of Practical Skills in Chemistry1.4 Further Physical Chemistry Practicals

Further Physical Chemistry Practicals (OCR A Level Chemistry)

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11 mark

A student is asked to investigate the initial rate of reaction for the chemical reaction between magnesium and nitric acid

Mg (s) + 2HNO3 (aq) → Mg(NO3)2 (aq) + H2 (g)

Alongside a timer, which piece of equipment would be the most appropriate to determine the initial rate of reaction?

  • Colorimeter

  • Gas syringe

  • Balance

  • Burette

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21 mark

The pH curve for the reaction of a weak acid with a strong base is shown.

q1-8-1-mcq-easy-physical-chemistry-practicals

Which row shows the correct location of the chemicals used for this reaction?

 

Burette

Conical flask

A

Ammonia

Ethanoic acid

B

Hydrochloric acid

Sodium hydroxide

C

Sodium hydroxide

Ethanoic acid

D

Ethanoic acid

Sodium hydroxide

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    31 mark

    There are several different methods for measuring reaction rates.

    Which of the following reactions cannot have their reaction rate measured using the method suggested?

      Reaction Method used
    A

    H2O2 (aq) + 2I– (aq) + 2H+ (aq) → 2H2O (l) + I2 (aq)

    		 Colorimetry
    B  Mg (s) + 2HNO3 (aq) → Mg(NO3)2 (aq) + H2 (g) Measurement of the change of mass
    C

    HCOOH (aq) + Br2 (aq) → 2H+ (aq) + 2Br– (aq) + CO2 (g)

    		 Measurement of the change in volume of a gas
    D HCOOCH3 (aq) + NaOH (aq) → HCOONa (aq) + CH3OH (aq) Titrating samples of the reaction mixture with acid

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      41 mark

      The following chemical tests were performed on ethanoic acid, hydrochloric acid and sulfuric acid.

      Chemical test Result
      Universal indicator solution  Turns red
      pH probe Records value between 1.0 and 2.0
      Phenolphthalein Remains colourless

       

      Which of the chemicals could produce the results shown?

      1. Ethanoic acid
      2. Hydrochloric acid
      3. Sulfuric acid

      • 1, 2 and 3

      • Only 1 and 2

      • Only 2 and 3

      • Only 1

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      51 mark

      What is the pH of a buffer solution containing 0.80 mol dm-3 solution of ethanoic acid, CH3COOH, and 0.80 mol dm-3 sodium ethanoate, CH3COONa at 25 ℃?

      (Ka of ethanoic acid at 25 ℃ = 1.78 x 10-5 mol dm-3)

      • 0.10

      • 5.75

      • 3.75

      • 4.75

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      11 mark

      The initial rate of reaction between marble chips and dilute acid can be determined by measuring the volume of gas given off per unit time and plotting a graph of the results.

      What is the reason for plotting a graph of the results?

      • The rate of reaction is a more accurate value

      • Outliers in the results can be spotted and discarded

      • An average rate can be determined from the graph

      • The rate of reaction can be found more precisely

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      21 mark

      The following partially drawn pH curve was obtained in an experiment:

      2-8

      Which of the following could be true?

        Label for
      x-axis      		 Solution in
      burette      		 Solution in
      conical flask
      A Volume of acid HCl NH3
      B Volume of base NaOH CH3COOH
      C Volume of acid CH3COOH NaOH
      D Volume of base NaOH HCl

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        31 mark

        Which of the following combinations could be used to make a buffer solution?

        • 40 cm3 of 0.1 mol dm-3 CH3COOH + 40 cm3 of 0.05 mol dm-3 NaOH

        • 40 cm3 of 0.1 mol dm-3 CH3COOH + 40 cm3 of 0.1 mol dm-3 NaOH

        • 20 cm3 of 0.1 mol dm-3 CH3COOH + 20 cm3 of 0.2 mol dm-3 NaOH

        • 40 cm3 of 0.1 mol dm-3 CH3COOH + 20 cm3 of 0.2 mol dm-3 NaOH

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        41 mark

        This question is about drawing curves and obtaining gradients in chemistry investigations.

        3-7

        Which of the following is not true?

        • There are an equal number of points on either side of the line of best fit

        • The hypotenuse of the gradient triangle includes at least half of the line

        • The gradient triangle starts and ends on points where the line of best fit crosses grid lines

        • The gradient in this graph is begin mathsize 16px style 60 over 6 end style

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        51 mark

        The reaction of hydrogen peroxide with iodide ions in acid solution can be set up as a clock reaction:

        H2O2 (aq) + 2H+ (aq) + 2I- (aq) → I2 (aq) + 2H2O (l)

        The reaction is first order with respect to iodide ions. A student performed an experiment to determine the order of this reaction they calculated a value of 0.963.

        What is the percentage error in this result?

        • 0.97%

        • 0.04%

        • 3.7%

        • 1.03% 

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        11 mark

        In a rate experiment 1.5 mol dm-3 hydrochloric acid was reacted with 0.25 g of magnesium. The volume of gas produced was collected in a 100 cm3 gas syringe.

        A graph was produced and a tangent was drawn at (0,0). The following points (9,38), (14,59) and (18,76) lie on this tangent.

        Calculate the initial rate.

        • 0.24 cm3 s-1

        • 0.24 mol dm-3 s-1

        • 4.22 cm3 s-1

        • 4.22 mol dm-3 s-1

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        21 mark

        Which of the following statements about the iodine clock reaction is/are correct?

        1. 10 cm3 of 10 vol hydrogen peroxide will produce 100 cm3 of oxygen.
        2. In the reaction between hydrogen peroxide and iodine, a thiosulfate ion is used as a timer.
        3. The following data shows that this reaction is second order with respect to potassium iodide.

        Concentration of potassium iodide (mol dm-3)

        Time for blue colour to appear (s)

        0.840

        2.50

        1.680

        1.20

        3.360

        0.63

        6.720

        0.32

        • 1, 2 and 3

        • Only 1 and 2

        • Only 2 and 3

        • Only 1

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        31 mark

        A series of reactions of ethanedioic acid and potassium manganate(VII) was carried out at different temperatures. The gas constant is 8.31 J K-1 mol-1.

        2MnO4– (aq) + 5H2C2O4 (aq) + 6H+ (aq) → 2Mn2+ (aq) + 8H2O (l) + 10CO2 (g)

        The following data was collected.

        Temperature, K

        Rate (1/t), s-1

        295

        0.016

        309

        0.031

        317

        0.043

        322

        0.053

        336

        0.067

         

        What is the activation energy (Ea) for this reaction?

        • 29200 kJ mol-1

        • 29.2 kJ mol-1

        • 10.3 kJ mol-1

        • 10300 kJ mol-1

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        41 mark

        A student wants to make 100 cm3 of a buffer solution between ethanoic acid and sodium ethanoate with a pH of 5.50. They start with 10 cm3 of 0.40 mol dm-3 ethanoic acid.

        pKa of ethanoic acid is 4.76.

        What is the mass of sodium ethanoate needed for this buffer solution?

        • 0.018 g

        • 0.180 g

        • 1.800 g

        • 1.318 g

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        51 mark

        Which statement about rate of reaction practicals is/are correct?

        1. Cleaning the magnesium before use will increase the accuracy of the results by removing the magnesium oxide.
        2. Manganese(II) oxide is a catalyst for the decomposition of hydrogen peroxide.
        3. During the magnesium and hydrochloric acid reaction, the volume of gas can be collected in a gas syringe or the change in mass can be recorded using a balance. 

        • 1, 2 and 3

        • Only 1 and 2

        • Only 2 and 3

        • Only 1

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