Energy changes - Jamb Chemistry Past Questions and Answers

Question 66:

• JAMB 2010

In which of the following is the entropy change positive?

A. Thermal dissociation of ammonium chloride
B. Reaction between an acid and a base
C. Addition of concentrated acid to water
D. Dissolution of sodium metal in water

Question 67:

• JAMB 2010

If a reaction is exothermic and there is a great disorder, it means that

A. The reaction is static
B. The reaction is in a state of equilibrium
C. There will be a large increase in free energy
D. There will be a large decrease in free energy

Question 68:

• JAMB 2011

A chemical reaction which the hydration energy is greater than the lattice energy is referred to as

A. A spontaneous reaction
B. An endothermic reaction
C. An exothermic reaction
D. A reversible reaction

Question 69:

• JAMB 2011

In the diagram above , X is the ``

A. Enthalpy
B. Enthalpy change
C. Activation energy
D. Activated complex

Question 70:

• JAMB 2012

CO(g) + H\(_2\) O\(_{(g)}\) → CO\(_{2(g)}\) + H\(_{2(g)}\)
Calculate the standard heat change of the reaction above, if the standard enthalpies of formation of CO\(_{2(g)}\), H\(_2\)O\(_{(g)}\) and CO\(_{(g)}\) in kJmol\(^{-1}\) are - 394, -242 and - 110 respectively.

A. + 262 KJ mol ^-1
B. - 262 KJ mol ^-1
C. + 42 KJ mol ^-1
D. - 42 KJ mol ^-1