Alkenes
Muhtasari
If alkanes are the calm members of the organic world, alkenes are the reactive ones. The single feature that makes the difference is a carbon-carbon double bond, and it turns these molecules into the raw material for plastics, ethanol and much of the chemical industry.
In this lesson you will learn that alkenes are unsaturated hydrocarbons with the general formula CnH2n, how their double bond drives addition reactions, and how bromine water provides a quick chemical test to tell an alkene from an alkane.
Malengo
- State that the bonding in alkenes includes a double carbon-carbon covalent bond and that alkenes are unsaturated hydrocarbons.
- Describe the manufacture of alkenes and hydrogen by the cracking of larger alkane molecules using a high temperature and a catalyst.
- Describe the reasons for the cracking of larger alkane molecules.
- Describe the test to distinguish between saturated and unsaturated hydrocarbons by their reaction with aqueous bromine.
- [Supplement] State that in an addition reaction only one product is formed.
- [Supplement] Describe the properties of alkenes in terms of addition reactions with: (a) bromine or aqueous bromine (b) hydrogen in the presence of a nickel catalyst (c) steam in the presence of an acid catalyst and draw the structural or displayed formulae of the products.
Maelezo ya Somo
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Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Alkenes. 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.
- Alkenes are unsaturated because they contain a: A. Single bond only B. Carbon-carbon double bond C. -OH group D. -COOH group Answer: B
- The general formula of the alkenes is: A. CnH2n+2 B. CnH2n C. CnH2n+1OH D. CnH2n-2 Answer: B
- When bromine water is shaken with an alkene, it: A. Stays orange B. Turns blue C. Is decolourised D. Turns red Answer: C
- Adding steam to ethene, with a catalyst, produces: A. Ethane B. Ethanol C. Ethanoic acid D. Methane Answer: B
- Reactions in which a molecule adds across a double bond are called: A. Substitution reactions B. Addition reactions C. Combustion reactions D. Neutralisation reactions Answer: B
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Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Alkenes? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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