Chemistry Practice Test – Energy Changes In Chemical Reactions (Questions with Answers and Explanations)

The enthalpies of neutralisation for reactions between strong acids and alkalis are usually ______ (JAMB 2015)

A. constant    
B. zero  
C. higher than those between weak acids and alkalis
D. lower than those between weak acids and alkalis

2SO_2(g) + O_2(g) —> 2SO_3(g) ΔH = -395.7 kJmol^-1

In the reaction above, the concentration of SO_3(g) can be increased by _______ (JAMB 2013)

A. increasing temperature
B. the addition of catalyst
C. decreasing the pressure
D. decreasing die temperature

The factor that lowers the activation energy of a chemical reaction is _____ (JAMB 2017)

A. pressure    B. temperature    C. catalyst   D. concentration

The degree of randomness increases from ______ (JAMB 2015)

A. gas to solid   B. gas to liquid   C. liquid to solid   D. solid to gas

The minimum amount of energy required for a reaction to take place is ________ (JAMB 2013)

A. activation energy
B. kinetic energy
C. lattice energy
D. ionization energy