1 Fatima is learning about the combustion of alkanes. She knows that alkanes burn in oxygen to produce carbon dioxide and water. What type of reaction is combustion? A Endothermic B Exothermic C Neutralization D Precipitation
2 Hydrocarbons are important because they are: A Only laboratory chemicals B Main source of fuels and raw materials C Non-combustible D Only pollutants
6 Halogenation of alkanes is an example of: A Addition reaction B Substitution reaction C Elimination reaction D Oxidation reaction
7 Which condition is required for halogenation of alkanes? A Darkness B Sunlight or UV light C Low temperature D Water
8 Which hydrocarbon readily undergoes addition reactions? A Alkane B Alkene C Cycloalkane D Alkane only
9 Uma is studying the properties of alkanes. She knows that alkanes are non-polar and have low boiling points. Which alkane is a gas at room temperature? A Hexane B Octane C Methane D Decane
10 The structural formula shows: A Molecular mass B Arrangement of atoms C Number of isomers D Physical state
12 David is studying the cracking of larger hydrocarbons. He knows that cracking is used to produce smaller, more useful hydrocarbons. What is cracking? A Breaking down large hydrocarbon molecules into smaller ones B Combining small hydrocarbons into larger ones C Adding halogens to hydrocarbons D Burning hydrocarbons in oxygen
14 Incomplete combustion of hydrocarbons produces: A Carbon dioxide B Water only C Carbon monoxide D Oxygen
15 Which reaction of hydrocarbons releases energy? A Addition B Halogenation C Combustion D Isomerization
16 Which pair represents structural isomers? A Ethane and propane B Butane and isobutane C Ethene and ethyne D Methane and ethane
17 Ibrahim is studying the combustion of alkanes. He knows that ethane (C2H6) undergoes complete combustion. What is the balanced equation for the complete combustion of ethane? A 2C2H6 + 7O2 → 4CO2 + 6H2O B C2H6 + 3O2 → 2CO2 + 3H2O C C2H6 + 7O2 → 2CO2 + 3H2O D 2C2H6 + 5O2 → 4CO2 + 6H2O
19 Emma is studying the properties of alkanes. She knows that alkanes undergo halogenation reactions. What is halogenation? A Reaction of alkanes with halogens B Reaction of alkanes with oxygen C Reaction of alkanes with hydrogen D Reaction of alkanes with water
21 Complete combustion of hydrocarbons produces: A CO and water B CO2 and water C Carbon and water D Hydrogen only
23 Ibrahim is learning about the preparation of alkanes by the reduction of alkyl halides. He uses ethyl bromide (C2H5Br) and reduces it. What alkane is formed? A Methane B Ethane C Propane D Butane
25 Yusuf is studying the halogenation of alkanes. He knows that iodine does not react readily with alkanes. Why is iodine less reactive in halogenation? A Because the I-I bond is too strong B Because the reaction is endothermic C Because iodine is a solid at room temperature D Because iodine is more reactive than chlorine
26 Fatima is studying the preparation of alkanes by hydrogenation of alkenes. She uses ethene and hydrogen in the presence of a catalyst. What is the product? A Methane B Ethane C Propane D Butane
27 George is studying complete combustion of methane. He writes the equation: CH4 + 2O2 → CO2 + 2H2O. What is the product of complete combustion? A Carbon monoxide and water B Carbon dioxide and water C Carbon and water D Methanol and water
28 Julia is studying the properties of alkanes. She knows that alkanes are less dense than water. Which of the following alkanes is used as a solvent? A Methane B Hexane C Propane D Butane
29 Xia is studying the cracking of larger hydrocarbons. She knows that thermal cracking requires high temperatures. What is a typical temperature range for thermal cracking? A 100-200°C B 400-600°C C 700-900°C D 1000-1200°C
30 Structural isomers differ in their: A Number of atoms B Arrangement of atoms C Molecular mass D Chemical formula