Chemistry Practice Test – Particulate Nature of Matter

If two isotopes of X, mass number 18 and 20 are in ratio 1:2, then the relative atomic mass of X is _____

A. 18.33    B. 18.61    C. 19.00    D. 19.33

The nucleus of an atom contains ______

A. neutrons and electrons only.
B. proton and neutron only.
C. neutron, electron and proton.
D. proton and electron only.

An element X with relative atomic mass 16.2 contains two isotopes   with relative abundance of 90% and  with relative abundance of 10%. The value of m is ______ 

(a) 14      (b)12      (c) 18      (d) 16

If 1 mole of sodium contains 6 x 10²³ atoms, how many atoms are contained in 0.6 g of sodium? [Na = 23] (WASSCE 2006)

Which of the states of matter contains particles that are held firmly together by some forces of cohesion?

(a) Gaseous state    (b) Solid state    (c) Liquid state      (d) none of the above