Chemistry Archives - Page 8 Of 414 - Erudites Academy

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Chemistry Archives - Page 8 Of 414 - Erudites Academy

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

by Sunday | Apr 16 | Chemistry NECO

A. CH B. CH3 C. CH4 D. C2H2 E. C2H6 Correct Answer: Option B – CH3 Explanation Relative No of Moles for Carbon = 79.2% ÷ 12 = 6.6 Relative No of Moles for Hydrogen = 20.8% ÷ 1 = 20.8 Ratio of Moles = Carbon 6.6 ÷ 6.6 = 1 Hydrogen = 20.8 ÷ 6.6 = 3...

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

Which of the following equations is NOT balanced?

by Sunday | Apr 16 | Chemistry NECO

A. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) B. CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g) C. 2KCIO3(s) → 2KCI(s)+ 3O2(g) D. NaH(s) + H2O(1) → NaOH(aq) +H2(g) E. Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) Correct Answer: Option B – CU(S) + HNO3(aq) →...

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

Compound with the general formula CnH2n2 belong to the_______ group

by Sunday | Apr 16 | Chemistry NECO

A. alkanal B. alkane C. alkanoate D. alkene E. alkyne Correct Answer: Option E – alkyne

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

The process involved in the decomposition of sugar by an enzyme is called?

by Sunday | Apr 16 | Chemistry NECO

A. dehydration B. esterification C. fermentation D. polymerization E. saponification Correct Answer: Option C = fermentation

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is?

by Sunday | Apr 16 | Chemistry NECO

A. ammonia B. carbon(IV)oxide C. hydrogen chloride D. sulphur (IV) oxide E. sulphur (VI) oxide Correct Answer: Option A – ammonia

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