Petrol is a fuel used in cars - Edexcel - GCSE Chemistry - Question 6 - 2018 - Paper 1
Question 6
Petrol is a fuel used in cars.
(a) Complete the sentence by putting a cross (✗) in the box next to your answer.
Petrol is obtained from crude oil.
The process used... show full transcript
Worked Solution & Example Answer:Petrol is a fuel used in cars - Edexcel - GCSE Chemistry - Question 6 - 2018 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is D fractional distillation. This process is used to separate different components of crude oil, including petrol.
Step 2
Explain which of the substances, P, Q or R, is octane.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The substance that is octane, C₈H₁₈, contains 8 carbon atoms and 18 hydrogen atoms. Therefore, upon examining the molecular structure of substances P, Q, and R, it can be identified as the one with 8 carbon atoms and corresponding hydrogen atoms.
Step 3
An explanation linking the following P and Q.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Both substances P and Q are saturated hydrocarbons, meaning they contain single bonds only and no double bonds. This characteristic indicates that they are both alkanes, which are a type of saturated hydrocarbon.
Step 4
An explanation linking the following molecules containing carbon and hydrogen (atoms).
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
All three substances P, Q, and R contain carbon and hydrogen atoms, which are necessary for them to be classified as hydrocarbons. However, it is crucial to note that octane specifically exemplifies a saturated hydrocarbon, differentiating it from other possible structures present.
