Thermochemistry

Which enthalpy changes have negative value?

• Ionisation energy

• First electron affinity

• heat of atomisation

• bond energy

Dissolving ammonium salt in water will cause a ___________ in surrounding temperature

• increase

• higher

• drop

• constant

Which of the following enthalpy changes is always positive?

• First electron affinity

• heat of neutralisation

• heat of atomisation

• Lattice energy

Which of the following cations has the highest hydration energy?

• Be²⁺

• Mg²⁺

• Ca²⁺

• Ba²⁺

State heat energy involves for the following reaction.

Ba(s)-->Ba(g)

• Heat of atomisation

• bond energy

• ionisation energy

• heat of formation

Which equation illustrates the first ionisation energy of the given element?

• S ( g) --> S⁺(g) + e

• S ( s) --> S⁺(g) + e

• S ( g) + e --> S^-(g)

• S^- ( g) --> S²⁺(g) + e

Which equation illustrates the heat of atomisation of the given element?

• Ca(s) --> Ca(g)

Which compound has the highest lattice energy?

• Na₂O

• NaCl

• NaBr

• NaI

Which of the following equations corresponds to the standard enthalpy change of formation of a substances?

• Mg²⁺(g) + 2Cl^-(g)

  --> MgCl₂(s)

• Mg(g) + 2Cl(g)

  --> MgCl₂(s)

• Mg(s) + Cl₂(g)

  --> MgCl₂(s)

• Mg(s) + Cl₂(g)

  --> MgCl₂(_g)

Which of the following species has zero standard enthalpy change of formation?

• NH₃(g)

• NO(g)

• O₂(g)

• H₂O(l)