Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
In a chemical reaction, the change in concentration of a reactant with time is
entropy of reaction
enthalpy of reaction
rate of reaction
order of reaction
Correct answer is C
No explanation has been provided for this answer.
Equilibrium constant is very large
∆H - T∆S = O
∆ H > T ∆ S
Equilibrium constant is less than zero
Correct answer is A
No explanation has been provided for this answer.
+2081 Jmol-1
-2081 Jmol-1
-649 Jmol-1
+649 Jmol-1
Correct answer is A
∆G = ∆H - T∆S
-899 = ∆H - 2980
∆H = -899 + 2980 = + 2081 Jmol-1
How many faraday of electricity is required to produce 0.25 mole of copper?
1.00F
0.01F
0.05F
0.50F
Correct answer is D
Cu → Cu2+ + 2e
1mole Cu requires 2f
0.25 mole Cu requires x
x = 0.25x2/1 = 0.50f
32395.5
30156.3
60784.5
15196.5
Correct answer is B
Cu → Cu2++ 2e
64g Cu requires 2 x 96500 coloumbs 10g Cu requires x columbs
x = 10x2x96500/64 =30156.3