Energy changes - Jamb Chemistry Past Questions and Answers

Question 71:

• JAMB 2012

An increase in entropy can best be illustrated by

A. Mixing of gases
B. Freezing of water
C. The condensation of vapour
D. Solidifying candle wax

Question 72:

• JAMB 2013

In an endothermic reaction, if there is a loss in entropy the reaction will

A. Be indeterminate
B. Be spontaneous
C. Not be spontaneous
D. Be at equilibrium

Question 73:

• JAMB 2013

the minimum amount of energy required for a reaction to take place is

A. Lattice energy
B. Ionization energy
C. Activation energy
D. Kinetic energy

Question 74:

• JAMB 2014

If the change in free energy of a system is -899 Jmol^-1 and the entropy change is 10Jmol^-1k^-1 at 250C, calculate the enthalpy change.

A. +2081 Jmol^-1
B. -2081 Jmol^-1
C. -649 Jmol^-1
D. +649 Jmol^-1

Question 75:

• JAMB 2015

The filter in the cigarette reduce the nicotine construct by

A. Burning
B. Adsorption
C. Evaporation
D. Absorption