1) In the experiment to prepare ethene and examine its properties, name the catalyst used? a) Calcium carbide b) Aluminium oxide c) Ethanol d) Manganese dioxide 2) In the experiment to prepare ethene and examine its properties, what is used to hold the ethanol in place? a) Glass wool b) Pipette 3) What is the role of aluminium oxide (Al₂O₃) in the preparation of ethene? a) A. It acts as a catalyst and a dehydrating agent b) B. It neutralizes the ethanol c) C. It supplies oxygen for combustion d) D. It absorbs the ethene gas 4) Why is glass wool used in the experiment? a) A. To act as a catalyst b) B. To absorb ethene c) C. To hold the ethanol in place in the test tube d) D. To filter impurities 5) Why is the first test tube of gas collected usually discarded? a) A. It contains water vapour b) B. It is too hot to handle c) C. It contains mainly air d) D. It contains aluminium oxide 6) What colour change is observed when ethene is added to acidified potassium permanganate solution? a) A. Purple to red b) B. Purple to colourless c) C. Colourless to purple d) D. Brown to colourless 7) What is the purpose of lifting the apparatus out of the water before turning off the Bunsen burner? a) A. To stop the reaction b) B. To allow more oxygen in c) C. To prevent ‘suck back’ of water d) D. To cool the ethanol faster 8) Ethene burns with which type of flame? a) A. Non-luminous blue flame b) B. Smoky yellow flame c) C. Bright luminous flame d) D. Incomplete flame with soot 9) Which of the following is a correct balanced equation for the complete combustion of ethene? a) A. C₂H₄ + O₂ → CO₂ + H₂O b) B. C₂H₄ + 3O₂ → 2CO₂ + 2H₂O c) C. C₂H₄ + O₂ → 2CO + 2H₂O d) D. 2C₂H₄ + 2O₂ → 4CO₂ 10) Which test confirms the presence of a double bond in ethene? a) A. Limewater test b) B. Glowing splint test c) C. Bromine water test d) D. Blue litmus paper 11) What is observed when ethene is added to bromine water? a) A. The solution changes from colourless to red/brown b) B. The solution changes from purple to colourless c) C. The solution changes from red/brown to colourless d) D. No change is observed 12) Which of the following is an important safety precaution when preparing ethene gas? a) A. Keep the test tube vertical at all times b) B. Do not heat the ethanol directly c) C. Turn off the Bunsen burner before lifting the apparatus from the water d) D. Always cool the aluminium oxide with water after the experiment 13) What is a common commercial use of ethene? a) A. To disinfect laboratory glassware b) B. As a ripening agent for fruit c) C. As a fuel for Bunsen burners d) D. To remove carbon dioxide from air 14) Which of the following correctly describes the physical properties of ethene? a) A. Colourless gas with a sweet smell b) B. Brown liquid with a pungent odour c) C. Green gas with a sharp odour d) D. Colourless liquid with no odour 15) What kind of reaction is the process of making ethene from ethanol? (2 answers) a) Addition reaction b) Dehydration reaction c) Elimination reaction 16) What is A? a) Ethanol b) Aluminium oxide c) Ethene d) Glass wool soaked in ethanol 17) What is B? a) Ethanol b) Aluminium oxide c) Ethene d) Glass wool soaked in ethanol 18) What is C? a) Ethanol b) Aluminium oxide c) Ethene d) Glass wool soaked in ethanol 19) Give a possible consequence of suck back during the ethene experiment. a) Cold water can be drawn into the hot test tube, causing it to crack or shatter. b) Ethene escapes

Ethene Preparation

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