Bimbingan SUKSES_1

What is the enthalpy change represented by the following equation?

NaCl (s) --> Na⁺ (aq) + Cl^- (aq)

• The ionisation energy of sodium and chloride

• The lattice energy of sodium chloride

• The enthalpy of hydration of sodium chloride

• The enthalpy of solution of sodium chloride

Which of the following equations represent the formation of a compound?

• Zn (s) + S (s) --> ZnS (s)

• H₂ (g) + O₂ (g) --> H₂O₂ (g)

• K (s) + 1/2 Br₂ (g) --> KBr (s)

• CH₂=CH₂ (g) + Br₂ (g) --> CH₂BrCH₂Br (l)

Which of the following equations represent the combustion of a compound?

• C (s) + 1/2 O₂ (g) --> CO (g)

• H₂ (g) + 1/2 O₂ (g) --> H₂O (g)

• CH₃NH₂ (l) + 9/4 O₂ (g) --> CO₂ (g) + 5/2 H₂O (l) + 1/2 N₂ (g)

• C₆H₁₂ (g) + 9 O₂ (g) --> 6 CO₂ (g) + 6 H₂O (l)

When 28.00 g sodium chloride was dissolved in 600 cm³ distilled water, the temperature of the solution decreased by 1.0 ^oC. Calculate the enthalpy of solution of sodium chloride. [Specific heat capacity of solution = 4.20 J g^-1o C^-1, density of solution = 1.0 gcm^-3]

• • + 5.25 kJ mol^-1

• • + 7.00 kJ mol^-1

• - 5.25 kJ mol^-1

• • - 7.50 kJ mol^-1

Which equation represents the standard enthalpy of atomisation?

• Mg (g) --> Mg (s)

• 1/2 Br₂ (l) --> Br (g)

• O₂ (g) --> 2O (g)

• H₂O (l) --> H₂ (g) + 1/2 O₂ (g)

A reaction is shown below

Ca (s) --> Ca²⁺ (g) + 2e

Which enthalpy change is not involved in the above reaction?

• Bond energy

• Enthalpy of atomisation

• First ionisation energy

• Second ionisation energy