Chemistry IGCSE Oxford AQA organic chemistry Summary Questions and Answers 2023 Updated

Chemistry IGCSE Oxford AQA organic chemistry Summary Questions and Answers 2023 Updated Crude oil is a mixture of... - CORRECT ANSWER -A very large number of compounds Most of the compounds in crude oil are... - CORRECT ANSWER -hydrocarbons What are hydrocarbons? - CORRECT ANSWER -Molecules made up of hydrogen and carbon atoms only How are the many kinds of hydrocarbons separated? - CORRECT ANSWER -They are separated into fractions, each of which contains molecules with a similar number of carbon atoms Describe the process of fractional distillation - CORRECT 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) - CORRECT ANSWER -saturated. They are called alkanes What is the general formula for alkanes - CORRECT ANSWER -CnH2n+2 What kind of bonds are found in an alkane - CORRECT ANSWER -all the carbon-carbon bonds are single covalent bonds Displayed formula and normal formula of ethane - CORRECT ANSWER -C2H6 What are the first three kinds of alkanes - CORRECT ANSWER -methane, ethane and propane The properties of hydrocarbons depend on - CORRECT ANSWER -the size of the molecule State the relationship between boiling point, viscosity, flammability and the size of the hydrocarbon - CORRECT 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 - CORRECT ANSWER -carbon dioxide, carbon monoxide, sulfur dioxide, oxides of nitrogen, and water (vapor). Solid particulates may also be released: soot (carbon) and unburnt fuels