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DP IB Chemistry: SL

Topic Questions

Home / IB / Chemistry: SL / DP / Topic Questions / 5. Energetics / Thermochemistry / 5.1 Energetics / Multiple Choice: Paper 1


5.1 Energetics

Question 1

Marks: 1

A student mixed 30.0 cm3 of 0.0250 mol dm-3 potassium hydroxide solution with 30.0 cm3 of 0.0250 mol dm-3 nitric acid. The temperature rose by 0.50 oC. Assume no heat was lost to the surroundings. 

The mixture had a specific heat capacity of 4.18 J g -1 K-1

What is the molar enthalpy change for the reaction?

  • begin mathsize 14px style negative fraction numerator 30 cross times 4.18 cross times 0.5 cross times 1000 over denominator 0.025 cross times 30 end fraction end style

  • begin mathsize 14px style negative fraction numerator 60 cross times 4.18 cross times 0.5 over denominator 0.025 cross times 30 end fraction end style

  • begin mathsize 14px style negative fraction numerator 0.025 space cross times space 30 over denominator 60 space space cross times space 4.18 space cross times space 0.5 space space cross times space 1000 end fraction end style

  • begin mathsize 14px style negative fraction numerator 60 space space cross times space 4.18 space cross times space 0.5 over denominator 0.025 space cross times space 30 end fraction end style

Choose your answer
  

Question 2

Marks: 1

An experiment was carried out to determine the approximate value for the molar enthalpy change of neutralisation. 

75 cm3 of 3.00 mol dm–3 hydrochloric acid was placed in a polystyrene beaker of negligible heat capacity. Its temperature was recorded, and then 75 cm3 of
3.00 mol dm−3 potassium hydroxide at the same temperature was quickly added, and the solution stirred. 

The temperature rose by 14 °C. The resulting solution may be considered to have a specific heat capacity of 4.18 J g-1 K-1

Which calculation below is correct?

  • begin mathsize 14px style negative fraction numerator left parenthesis 75 space cross times space 4.18 space cross times space 14 right parenthesis over denominator left parenthesis 6.0 cross times 0.150 right parenthesis end fraction end styleJ mol-1

  • begin mathsize 14px style negative fraction numerator left parenthesis 150 space cross times space 4.18 space cross times space 14 right parenthesis over denominator left parenthesis 3.0 space cross times 0.075 right parenthesis end fraction end styleJ mol-1

  • begin mathsize 14px style negative fraction numerator left parenthesis 150 space cross times space 4.18 space cross times space 14 right parenthesis over denominator left parenthesis 3.0 space cross times 75.0 right parenthesis end fraction end styleJ mol-1

  • begin mathsize 14px style negative fraction numerator left parenthesis 75 space cross times space 4.18 space cross times space 287 right parenthesis over denominator left parenthesis 6.0 cross times space 0.150 right parenthesis end fraction end styleJ mol-1

Choose your answer
  

Question 3

Marks: 1

The table below discusses three types of enthalpy change:

‘+’ means that this type of standard enthalpy change can only have positive values,

‘–’ means that this type of standard enthalpy change can only have negative values,

‘+ / –’ means that either positive or negative values are possible. 

Which row is correct?

 

formation

combustion

neutralisation

A

+

+

+ / –

B

+ / –

+

+ / –

C

+ / –

D

+

    Choose your answer
      

    Question 4

    Marks: 1

    Using a spirit burner, ethanol is used to heat a container of water.

    In this experiment:

    Mass of ethanol burned, g

    a

    Mass of water, g

    b

    Specific heat capacity of water, J g–1 K–1

    d

    Temperature rise, °C

    y

     

    How much heat energy is absorbed by the water? 

    • ady

    • bdy

    • bd(y+273)

    • (y+273) / ad

    Choose your answer
      

    Question 5

    Marks: 1

    An iron block with a mass of 0.11 kg absorbs 504 J of heat energy. What is the temperature rise in K?

    Specific heat capacity of iron = 0.448 J g–1 K–1

    • 1.02 x104

    • 1.10

    • 10.23

    • 9.78 x 10-2

    Choose your answer
      

    Question 6

    Marks: 1

    Which statements are correct for an endothermic reaction? 

    1. The products are more stable than the reactants
    2. The enthalpy change is positive
    3. The temperature of the surroundings decreases
    • I and II only

    • I and III only

    • II and III only 

    • I, II and III

    Choose your answer
      

    Question 7

    Marks: 1

    Which assumptions are correct when calculating the enthalpy change for a reaction in solution? 

    1. The density of the solution is 1 g cm-3
    2. The specific heat capacity of the solution is 4.18 J g-1 K-1
    3. The correct stoichiometric quantities of reactants for a complete reaction are used 

    • I and II only

    • I and III only

    • II and III only

    • I, II and III

    Choose your answer
      

    Question 8

    Marks: 1

    What is the closest integer value of the temperature change for this reaction, from the graph

    m1

    • 8

    • 9

    • 11

    • 35

    Choose your answer
      

    Question 9

    Marks: 1

    Which enthalpy changes correctly describe the following reactions? 

    Reaction 1: HNO3 (aq) + NH3 (aq) → NH4NO3 (aq)

    Reaction 2: CuCO3 (s) → CuO (s) + CO2 (g)

    Reaction 3: S (s) + O2 (g) → SO2 (g)

     

    ΔHӨc

    ΔHӨf

    ΔHӨneut

    ΔHӨr

    A

    2

    2

    1

    3

    B

    3

    2

    1

    2

    C

    3

    3

    1

    2

    D

    2

    3

    1

    3

     

      Choose your answer
        

      Question 10

      Marks: 1

      Which systems are correctly described? 

      1. Matter and energy can be transferred across the boundary of an open system
      2. Only matter can be transferred across the boundary of a closed system
      3. Matter and energy cannot be transferred across the boundary of an isolated system
      • I and II only

      • I and III only 

      • II and III only 

      • I, II and III

      Choose your answer