Chemistry (9-1) - 0971 CIE

Alkanes

Muhtasari

The alkanes are the simplest and most familiar organic family: the methane in natural gas, the propane in camping stoves, the petrol in cars. They are the workhorse fuels of the modern world, prized for the energy they release when they burn.

In this lesson you will learn that alkanes are saturated hydrocarbons with the general formula CnH2n+2, why they are generally unreactive, and the two reactions you must know: combustion in air and substitution with halogens in ultraviolet light.

Malengo

  1. State that the bonding in alkanes is single covalent and that alkanes are saturated hydrocarbons.
  2. Describe the properties of alkanes as being generally unreactive, except in terms of combustion and substitution by chlorine.
  3. [Supplement] State that in a substitution reaction one atom or group of atoms is replaced by another atom or group of atoms.
  4. [Supplement] Describe the substitution reaction of alkanes with chlorine as a photochemical reaction, with ultraviolet light providing the activation energy, E , and draw the structural or a displayed formulae of the products, limited to monosubstitution.

Somo la Sauti

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Maelezo ya Somo

Alkanes provide most of the fuels we depend on, so understanding how they burn matters for energy, transport and the environment. Their general lack of reactivity also makes them a useful baseline, the calm starting point against which the more reactive families are compared.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Alkanes. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. Alkanes are described as saturated because they contain only: A. Double bonds B. Single carbon-carbon bonds C. Triple bonds D. Functional groups Answer: B
  2. The general formula of the alkanes is: A. CnH2n B. CnH2n+2 C. CnH2n-2 D. CnH2n+1OH Answer: B
  3. Complete combustion of an alkane produces: A. Carbon monoxide and water B. Carbon dioxide and water C. Hydrogen and carbon D. Carbon dioxide only Answer: B
  4. The reaction of methane with chlorine in UV light is a: A. Addition reaction B. Neutralisation C. Substitution reaction D. Combustion reaction Answer: C
  5. Which condition is needed for an alkane to react with chlorine? A. A catalyst B. Ultraviolet light C. High pressure D. An acid Answer: B

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Vitabu Vinavyopendekezwa

Cambridge IGCSE Chemistry Coursebook
Cambridge IGCSE Chemistry Coursebook
Manukuu: Fifth edition
Mchapishaji: Cambridge University Press
Mwaka: 2021
ISBN: 978-1-108-95160-9
Maelezo: Endorsed coursebook with full coverage of the 0620/0971 syllabus, worked examples and practical guidance.
Cambridge IGCSE Chemistry
Cambridge IGCSE Chemistry
Manukuu: Fourth edition
Mchapishaji: Hodder Education
Mwaka: 2021
ISBN: 978-1-398-31050-6
Maelezo: Endorsed textbook covering the Core and Supplement content with questions and practical work.

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