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.
Which of the following decrease when a given mass of gas is compressed to half its initial volume?
Atomic radius of each
Average intermolecular distance
Frequency of collisions
Number of molecules presents
Correct answer is B
No explanation has been provided for this answer.
If the electron configuration of a element is p1s2 2s2 2P5, how many unpaired electron are there?
2
8
1
4
Correct answer is C
No explanation has been provided for this answer.
How many electrons are in the L shell of 3115P?
5
8
18
2
Correct answer is B
No explanation has been provided for this answer.
What is the volume of oxygen required to burn complete 45 cm3 of methane at s.t.p?
135.0 cm3
180.0 cm3
45.0 cm3
90.0 cm3
Correct answer is D
CH4(g) + 2O2(g) → 2H2O(g) + CO2(g)
1 volume of methane will react with 90 cm3 of oxygen at s.t.p
Which experiment led to the measurement of the charge on an electron?
Mass spectrometric experiment
Oil-drop experiment
Scattering α - particles
Discharge-tube experiment
Correct answer is B
In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron.