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.
The alkanoic acid found in human sweat is
CH\(_3\)-COOH
CH\(_3\)—CH\(_2\)—COOH
H-COOH
CH\(_3\)
Correct answer is B
Bacteria of the genus Propionibacterium produce propionic acid (Propanoic Acid) as the end-product of their anaerobic metabolism. This class of bacteria is commonly found in the stomach of ruminants and the sweat glands of humans, and their activity is partially responsible for the odour of both Swiss cheese and sweat.
The general formula of alkanones is
RCHO
R\(_2\)CO
RCOOH
RCOOR
Correct answer is B
Alkanones also known as ketones have the general formula R\(_2\)CO
The situation obtained when a perfect gas expands into a vacuum is
ΔH is positive and TΔ S is zero
ΔH is positive and T Δ S is negative
ΔH is negative and TΔ S is zero
ΔH is zero and T Δ S is positive
Correct answer is D
The definition of enthalpy change is
ΔH = ΔU + Pex(ΔV)
The enthalpy change is zero because both terms on the right are zero in free expansion of an ideal gas.
There is no external pressure in a free expansion, so P (ex) = 0. And the internal energy change, ΔU of free expansion in a closed system is zero since no inter molecular forces have to be overcome. The temperature remains constant and no heat is absorbed or released.
have no effect on the equilibrium position
increase the rate of both the forward and reverse reactions equally
favour the forward reaction
favour the reverse reaction
Correct answer is C
N\(_{2(g)}\) + 3H\(_{2(g)}\) ⇔ 2NH\(_{3(g)}\) In the Haber process, the forward reaction is exothermic and the backward reaction is endothermic. If the temperature is decreased, the yield from the exothermic direction is increased i.e. the forward reaction is increased.
Sieving is a technique used to separate mixtures containing solid particles of
small sizes
large sizes
different sizes
the same size
Correct answer is C
Sieving is a simple and convenient technique of separating particles of different sizes.