Chemistry IGCSE Oxford AQA organic chemistry Exam study guide
COMPLETE EXAM Questions and Answers (Verified Answers) (Latest Update
2025) UPDATE!!
Crude oil is a mixture of... - (answer)A very large number of compounds
Most of the compounds in crude oil are... - (answer)hydrocarbons
What are hydrocarbons? - (answer)Molecules made up of hydrogen and carbon atoms only
How are the many kinds of hydrocarbons separated? - (answer)They are separated into fractions, each
of which contains molecules with a similar number of carbon atoms
Describe the process of fractional distillation - (answer)>The crude oil is heated so that it
>vaporizes the hydrocarbons
and inserted into the fractioning column.
>Next, there is a temperature gradient, where highest boiling points are found at the bottom
>hydrocarbons condense at different levels in the column
Most of the hydrocarbons in crude oil are (what kind of hyrdocarbon) - (answer)saturated. They are
called alkanes
What is the general formula for alkanes - (answer)CnH2n+2
What kind of bonds are found in an alkane - (answer)all the carbon-carbon bonds are single covalent
bonds
Displayed formula and normal formula of ethane - (answer)C2H6
What are the first three kinds of alkanes - (answer)methane, ethane and propane
, Chemistry IGCSE Oxford AQA organic chemistry Exam study guide
COMPLETE EXAM Questions and Answers (Verified Answers) (Latest Update
2025) UPDATE!!
The properties of hydrocarbons depend on - (answer)the size of the molecule
State the relationship between boiling point, viscosity, flammability and the size of the hydrocarbon -
(answer)As the size of the molecule increases,
Flammability decreases
Viscosity increases
Boiling point increases
The gases released into the atmosphere when a fuel burns may include - (answer)carbon dioxide, carbon
monoxide, sulfur dioxide, oxides of nitrogen, and water (vapor). Solid particulates may also be released:
soot (carbon) and unburnt fuels
Which of the previously-stated gases cause acid rain - (answer)oxides of nitrogen and sulfur dioxide
Which of the previously-stated gases cause climate change - (answer)carbon dioxide
Which of the previously-stated gases cause global dimming - (answer)particulates
What is likely to form in incomplete combustion of fuels - (answer)carbon monoxide
How are oxides of nitrogen formed? - (answer)In engines where there are HIGH TEMPERATURES
The combustion of hydrocarbons is performed because they release - (answer)energy
during combustion, which two atoms are oxidised - (answer)hydrogen and carbon
COMPLETE EXAM Questions and Answers (Verified Answers) (Latest Update
2025) UPDATE!!
Crude oil is a mixture of... - (answer)A very large number of compounds
Most of the compounds in crude oil are... - (answer)hydrocarbons
What are hydrocarbons? - (answer)Molecules made up of hydrogen and carbon atoms only
How are the many kinds of hydrocarbons separated? - (answer)They are separated into fractions, each
of which contains molecules with a similar number of carbon atoms
Describe the process of fractional distillation - (answer)>The crude oil is heated so that it
>vaporizes the hydrocarbons
and inserted into the fractioning column.
>Next, there is a temperature gradient, where highest boiling points are found at the bottom
>hydrocarbons condense at different levels in the column
Most of the hydrocarbons in crude oil are (what kind of hyrdocarbon) - (answer)saturated. They are
called alkanes
What is the general formula for alkanes - (answer)CnH2n+2
What kind of bonds are found in an alkane - (answer)all the carbon-carbon bonds are single covalent
bonds
Displayed formula and normal formula of ethane - (answer)C2H6
What are the first three kinds of alkanes - (answer)methane, ethane and propane
, Chemistry IGCSE Oxford AQA organic chemistry Exam study guide
COMPLETE EXAM Questions and Answers (Verified Answers) (Latest Update
2025) UPDATE!!
The properties of hydrocarbons depend on - (answer)the size of the molecule
State the relationship between boiling point, viscosity, flammability and the size of the hydrocarbon -
(answer)As the size of the molecule increases,
Flammability decreases
Viscosity increases
Boiling point increases
The gases released into the atmosphere when a fuel burns may include - (answer)carbon dioxide, carbon
monoxide, sulfur dioxide, oxides of nitrogen, and water (vapor). Solid particulates may also be released:
soot (carbon) and unburnt fuels
Which of the previously-stated gases cause acid rain - (answer)oxides of nitrogen and sulfur dioxide
Which of the previously-stated gases cause climate change - (answer)carbon dioxide
Which of the previously-stated gases cause global dimming - (answer)particulates
What is likely to form in incomplete combustion of fuels - (answer)carbon monoxide
How are oxides of nitrogen formed? - (answer)In engines where there are HIGH TEMPERATURES
The combustion of hydrocarbons is performed because they release - (answer)energy
during combustion, which two atoms are oxidised - (answer)hydrogen and carbon
