Cracking, alkenes and the bromine water test
10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-PS1-2 · England: GCSE Combined Science: Organic chemistry
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Question 1
Cracking: C₁₃H₂₈ → C₇H₁₆ + an alkene. How many hydrogen atoms are in one molecule of the alkene?
Answer
Question 2
Alkenes and cracking: which statement is NOT true?
- A. Cracking is a thermal decomposition reaction.
- B. Cracking makes longer molecules from shorter ones.
- C. Alkenes contain a carbon–carbon double bond.
- D. Alkenes are more reactive than alkanes.
Question 3
What is the general formula of the alkenes?
- A. CₙHₙ
- B. CₙH₂ₙ₋₂
- C. CₙH₂ₙ₊₂
- D. CₙH₂ₙ
Question 4
Cracking: C₁₂H₂₆ → C₈H₁₈ + an alkene. How many hydrogen atoms are in one molecule of the alkene?
Answer
Question 5
Alkenes and cracking: which statement is NOT true?
- A. Alkenes contain a carbon–carbon double bond.
- B. Ethene can be used to make the polymer poly(ethene).
- C. Methene is the smallest alkene.
- D. Cracking is a thermal decomposition reaction.
Question 6
Why do refineries crack long-chain hydrocarbons?
- A. Long chains are too useful
- B. To make crude oil
- C. To remove all the carbon
- D. There is more demand for shorter chains such as petrol, and alkenes make polymers
Question 7
Cracking: C₁₀H₂₂ → C₈H₁₈ + an alkene. How many carbon atoms are in one molecule of the alkene?
Answer
Question 8
Alkenes and cracking: which statement is NOT true?
- A. Cracking is a thermal decomposition reaction.
- B. Alkanes decolourise bromine water.
- C. Alkenes are more reactive than alkanes.
- D. Ethene can be used to make the polymer poly(ethene).
Question 9
Why do refineries crack long-chain hydrocarbons?
- A. There is more demand for shorter chains such as petrol, and alkenes make polymers
- B. To make crude oil
- C. To remove all the carbon
- D. Long chains are too useful
Question 10
Cracking: C₁₄H₃₀ → C₁₁H₂₄ + an alkene. How many carbon atoms are in one molecule of the alkene?
Answer
Question 11
Alkenes and cracking: which statement is NOT true?
- A. Ethene can be used to make the polymer poly(ethene).
- B. Alkenes are more reactive than alkanes.
- C. Methene is the smallest alkene.
- D. Cracking is a thermal decomposition reaction.
Question 12
Bromine water is shaken with a hydrocarbon and turns from orange to colourless. What does this show?
- A. The hydrocarbon contains oxygen
- B. The hydrocarbon is an alkene (it has a C=C double bond)
- C. The bromine has evaporated
- D. The hydrocarbon is an alkane
Question 13
Cracking: C₈H₁₈ → C₃H₈ + an alkene. How many carbon atoms are in one molecule of the alkene?
Answer
Question 14
Alkenes and cracking: which statement is NOT true?
- A. Cracking makes longer molecules from shorter ones.
- B. Alkenes contain a carbon–carbon double bond.
- C. Alkenes are more reactive than alkanes.
- D. Ethene can be used to make the polymer poly(ethene).
Question 15
Why do refineries crack long-chain hydrocarbons?
- A. To remove all the carbon
- B. Long chains are too useful
- C. To make crude oil
- D. There is more demand for shorter chains such as petrol, and alkenes make polymers
Question 16
Cracking: C₈H₁₈ → C₄H₁₀ + an alkene. How many hydrogen atoms are in one molecule of the alkene?
Answer
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