11.5. Alkenes
A subsection of Chemistry, 5070, through 11. Organic chemistry
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Part of the structures of carbon dioxide and calcium carbide are shown. O=C=O O=C=O O=C=O O=C=O O=C=O O=C=O carbon dioxide calcium carbide Ca2+ C2 2– Ca2+ Ca2+ C2 2– Ca2+ C2 2– C2 2– Ca2+ C2 2– Ca2+ C2 2– Ca2+ Ca2+ C2 2– Ca2+ C2 2– C2 2– Ca2+ C2 2– Explain in terms of structure and bonding why carbon dioxide has a low boiling point and calcium carbide has a high boiling point. Calcium carbide, CaC2, reacts with water to form ethyne, C2H2, and calcium hydroxide. Construct the equation for this reaction. Ethyne is an unsaturated hydrocarbon. State the meaning of the term hydrocarbon. Ethyne is a member of the alkyne homologous series. The molecular formulae of the first four members of the alkyne homologous series are shown. C2H2 C3H4 C4H6 C5H8 Predict the formula for the fifth member of the alkyne homologous series. Ethyne reacts with hydrogen in a similar way to ethene reacting with hydrogen. The reaction between ethyne and hydrogen is exothermic. What type of chemical reaction occurs when ethyne reacts with hydrogen? Predict the molecular formula of a product formed when ethyne reacts with hydrogen. 1,2-dichloroethene is produced when excess ethyne reacts with chlorine. The structure of 1,2-dichloroethene is shown. Cl C H H Cl C Deduce the partial structure of the polymer of 1,2-dichloroethene. Show three repeat units.
5070_w20_qp_21
THEORY
2020
Paper 2, Variant 1
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