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.
22688Ra → x86Rn + α - particle
What is the value of x in the nuclear reaction above?
220
222
226
227
Correct answer is B
22688Ra → 22286Rn + α - particle
spherical
elliptical
spiral
circular
Correct answer is A
No explanation has been provided for this answer.
An electron can be added to a halogen atom to form a halide ion with
2 valence electrons
3 valence electrons
7 valence electrons
8 valence electrons
Correct answer is D
No explanation has been provided for this answer.
5s
20s
40s
60s
Correct answer is C
Relative molecular mass of CH4 = 12 * 1 + 4 = 16
Relative molecular mass of SO2 = 32 + 10 *2 = 64
tSO2/tCH4 = √MSO2/MCH4
t/20 = √64/16 = √4
t/20 = 2
∴ t = 20 * 2 = 40sec
It is difficult to achieve an orderly arrangement of the molecules of a gas because they?
have no definite shape
have little force of attraction between them
can collide with one another in the container
are too small in size
Correct answer is B
In most cases, there are essentially no attractive forces between particles. This means that a gas has nothing to hold a specific shape or volume.