Other important addition reactions of alkenes
4 marks · NormalThe table shows two important reactions of ethene.
| Name of reaction | Reactants | Product |
|---|---|---|
| Hydrogenation | Ethene (), hydrogen () | |
| Hydration | Ethene (), water (steam, ) |
Complete the table by writing the balanced symbol equation for each reaction. Write the correct chemical formula for each product.
Hydrogenation of ethene:
Hydration of ethene:
State the names of the organic products formed in the two reactions above.
Product from hydrogenation:
Product from hydration:
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a(i)) · must show Balanced reactants and product for hydrogenation
(a(ii)) · must show Balanced reactants and product for hydration, Product formula corresponds to ethanol
(b(i)) ethane · must show Correct name for
(b(ii)) ethanol · must show Correct name for
Common mistakes: Writing an unbalanced equation; Incorrect molecular formula for water in hydration; Incorrect product names (e.g., missing 'ethanol')
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Marking points
M1 (a(i)) · 1 mark · Writes the balanced equation for hydrogenation:
M2 (a(ii)) · 1 mark · Writes the balanced equation for hydration:
M3 (a(ii)) · 1 mark · Correctly identifies the product as ethanol with its formula. (follow-through)
B1 (b(i)) · 0.5 marks · States the name ethane for the hydrogenation product.
B2 (b(ii)) · 0.5 marks · States the name ethanol for the hydration product.
Worked solution
a(i) Hydrogenation: Ethene reacts with hydrogen to produce ethane.
a(ii) Hydration: Ethene reacts with steam to produce ethanol.
b(i) The product from hydrogenation is ethane.
b(ii) The product from hydration is ethanol.