Complete the following table. (Relative atomic masses: H = 1 , C = 12 .) Name of hydrocarbon ethane ethene The molecular formula of the hydrocarbon C 2 H 6 _____ The relative molecular mass of hydrocarbon _____ _____ The structural formula of the hydrocarbon _____ _____ Colour of bromine water after being shaken with the hydrocarbon _____ colourless

Name of hydrocarbon ethane ethene The molecular formula of the hydrocarbon C 2 H 6 C 2 H 4 The relative molecular mass of hydrocarbon 30 = 12 × 2 + 1 × 6 28 = 12 × 2 + 1 × 4 The structural formula of the hydrocarbon Colour of bromine water after being shaken with the hydrocarbon Orange/ brown colourless Ethane is an alkane with the general formula C n H 2 n + 2 and ethene is an alkene with the general formula C n H 2 n . The relative molecular mass is equal to the sum of the relative atomic masses of all the atoms that comprise a molecule. Bromine water becomes colourless when it is shaken with an alkene. Bromine water is an orange/brown solution of bromine. Alkenes can decolourise bromine water, but alkanes cannot so the colour remains the same. It is a test for unsaturated compounds.

E M B I B E

Cambridge IGCSE Chemistry Workbook 4th Edition>Chapter 10 - Organic Chemistry>Exercise 10.3>Q a

EASY

Upper Secondary-IGCSE

IMPORTANT

Earn 100

The table shows the formulae of the first three members of the alcohol homologous series.

Alcohol Formula

Methanol ${CH}_{3} OH$

Ethanol $C_{2} H_{5} OH$

Propanol $C_{3} H_{7} OH$

Use the information given to deduce the general formula for the alcohol homologous series.

Important Questions on Organic Chemistry

EASY

Upper Secondary-IGCSE

IMPORTANT

Cambridge IGCSE Chemistry Workbook 4th Edition>Chapter 10 - Organic Chemistry>Exercise 10.3>Q b

Ethanol, the most significant of the alcohols can be manufactured from either ethene or glucose. Write an equation for the industrial production of ethanol from ethene and state the conditions under which the reaction takes place.

HARD

Upper Secondary-IGCSE

IMPORTANT

Cambridge IGCSE Chemistry Workbook 4th Edition>Chapter 10 - Organic Chemistry>Exercise 10.5>Q a

Complete the following table. (Relative atomic masses: $H = 1, C = 12$ .)

Name of hydrocarbon	ethane	ethene
The molecular formula of the hydrocarbon	$C_{2} H_{6}$	_____
The relative molecular mass of hydrocarbon	_____	_____
The structural formula of the hydrocarbon	_____	_____
Colour of bromine water after being shaken with the hydrocarbon	_____	colourless