Chemistry Practice Tests – Symbols, Formulae and Equations


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Determine the molecular formula of an alkane whose vapour density is 15

(H = 1, C = 12, R.M.M = 2.VD)

(a) CH2 (b) C3H6 (c) CH4 (d) C2H6


The correct formula of tungsten is _______

(a) T    (b) Tu    (c) W    (d) Tn


A hydrocarbon contained 14.3% hydrogen. The empirical formula of the hydrocarbon would be ______ [C = 12, H = 1]

(a) CH     (b) CH2    (c) CH    (d) CH4


What is the empirical formula of a hydrocarbon containing 0.08 moles of carbon and 0.32 moles of hydrogen?

(a) CH2   (b) CH3 (c) CH4 (d) C2H4


An element X forms the following oxides X2O XO and XO2. This phenomenon illustrates the law of ______

(a) conservation of mass.  
(b) definite proportion.  
(c) mass action.  
(d) multiple proportion.


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