Chemistry Practice Test – Symbols, Formulae and Equations (Questions with Answers and Explanations)

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Chemistry Practice Test – Symbols, Formulae and Equations (Questions with Answers and Explanations)

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1. 


An organic compound has the composition 55% carbon, 9% hydrogen and 36% oxygen. The compound has the empirical formula is _______ [C = 12, H = 1, O = 16] (NECO 2016)

A. CH6O      B. C2H4O       C. C2H5O      D. C3H5O

2. 


A hydrocarbon containing 88.9% carbon has the empirical formula ______[H = 1, C = 12] 

(a) CH     (b) CH2     (c) C2H3     (d) C2H5

3. 


A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formula? [C = 12, H = 1] (NECO 2021)

A. C2H2      B. C3H3       C. C4H4       D. C5H5

4. 


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

5. 


Which of the symbols below represents 2 molecule of oxygen?

A. O   B. O2   C. 2O2   D. none of the above

 

 

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