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DP IB Chemistry: HL

Topic Questions

Home / IB / Chemistry: HL / DP / Topic Questions / 15. Energetics/Thermochemistry (HL only) / 15.1 Energy Cycles / Multiple Choice: Paper 1


15.1 Energy Cycles

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Question 1

Marks: 1

Which of the following correctly explains the trend in enthalpy of hydration of the metal ions down Group 1?

  • The lone pair of the oxygen atom becomes more available for bonding 

  • The attraction between the ion and the delta negative oxygen atoms in the water decreases down the group

  • The attraction between the ion and the hydrogen ions in water decreases down the group

  • The attraction between the ion and the delta positive hydrogen atoms in water decreases down the group

Choose your answer
  
Key Concepts
Size & Charge of Ions & Hydration Enthalpy

Question 2

Marks: 1

Which ionic compound has the most endothermic lattice enthalpy?

  • SrCl2

  • CaO

  • SrO

  • CaCl2

Choose your answer
  
Key Concepts
Size & Charge of Ions & Lattice Enthalpy

Question 3

Marks: 1

Which expression represents the first electron affinity of iodine? 

Name of enthalpy change Enthalpy change / kJ mol-1
Enthalpy of atomisation of calcium  +178
1st ionisation energy of calcium  +590
2nd ionisation energy of calcium +1145
Enthalpy of atomisation of iodine +107
Lattice energy of calcium iodide -2074
Enthalpy of formation of calcium iodide  -534

  • -534 - 178 - 590 - 1145 - (2 x 107) - (-2074)

  • -534 - 178 - 590 - 1145 - 107 - (-2074)

  • fraction numerator negative 534 space minus space 178 space minus space 590 space minus space 1145 space minus space left parenthesis 2 space cross times space 107 right parenthesis space minus space left parenthesis negative 2074 right parenthesis over denominator 2 end fraction

  • fraction numerator plus 534 space minus space 178 space minus space 590 space minus space 1145 space minus space left parenthesis 2 space straight x space 107 right parenthesis space plus space 2074 over denominator 2 end fraction

Choose your answer
  
Key Concepts
Born-Haber Cycle Calculations

Question 4

Marks: 1

Which equation represents the correct working to determine the lattice enthalpy of magnesium chloride, ΔHθlatt(MgCl2)? 

Enthalpy change  Representation 
ΔHθsol(MgCl2) x
ΔHθhyd(Mg2+) y
ΔHθhyd(Cl-) z

  • x - (y + z)

  • x + (y + z)

  • x + (y + 2z)

  • x - (y + 2z)

Choose your answer
  
Key Concepts
Dissolution Energy Cycles

Question 5

Marks: 1

Which row of the table correctly represents the equations for the lattice enthalpy of substance W2X and the ionisation energy of atom W?

  Lattice enthalpy Ionisation energy 
A. 2W (s) + X2 (g) → W2X W (g) → W+ (g) + e-
B. W2X (s) → 2W+ (g) + X2- (g)  W (g) → W2+ (g) + 2e-
C. W2X (s) → 2W+ (g) + X2- (g)  W (g) → W+ (g) + e-
D. W2X (s) → 2W (g) + X (g)  W (g) → W2+ (g) + 2e-
    Choose your answer
      
    Key Concepts
    Key Enthalpy Terms


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