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 pressure exerted by a gas is a function of the
total volume of the gas
speed of the gaseous molecules
mass of each gaseous molecule
frequency of collision between gaseous molecules
Correct answer is D
No explanation has been provided for this answer.
Which of the following phenomenna lead to decrease in volume of a liquid in an open container?
Brownian motion
Diffusion
Evaporation
Sublimation
Correct answer is C
No explanation has been provided for this answer.
The gas law which describes the relationship between volume and temperature is
Boyle's law
Charles' law
Dalton's law
Graham's law
Correct answer is B
No explanation has been provided for this answer.
The percentage by mass of calcium in Ca(OCI)2 is [Ca = 40.0; CI = 35.5; O = 16.0]
28.0%
31.6%
43.8%
44.5%
Correct answer is A
Molar mass of Ca(OCl)2 = 40 + (16 + 35.5)x2 = 143
% by mass of calcium in the compound =massofcalcuimmolarmassofcompound x 100%
% calcium = 40143×100
= 27.98% = 28%
464.30 cm3
625.00 cm3
1000.00 cm3
2153.80 cm3
Correct answer is A
number of moles = molar concentration x volume(dm3)
molar concentration(C) = 0.25mol/dm3, volume = ? and number of mole(n) = massmolarmass = 6.556 ( where 56g/mol = molar mass of KOH)
6.556 = 0.25 x V
V = 0.116070.25 = 0.46428dm^3 → 464.3cm^3