Chemistry - 4CH1 PearsonEdexcel

Alkanes

Bayani Gaba-gaba

Alkanes are the simplest family of organic molecules and the backbone of the fossil fuel industry. From the methane that heats your home to the octane that powers a car, these compounds are everywhere in daily life, yet their chemistry is surprisingly straightforward once you grasp one idea: saturation.

In this lesson you will learn the general formula for alkanes, how to name and draw the first five members, why they are classified as saturated hydrocarbons, and how they react with halogens under ultraviolet light. These are core specification points that Edexcel revisits in both Paper 1 and Paper 2.

Manufura

know the general formula for alkanes
explain why alkanes are classified as saturated hydrocarbons
understand how to draw the structural and displayed formulae for alkanes with up to five carbon atoms in the molecule, and to name the unbranched-chain isomers
describe the reactions of alkanes with halogens in the presence of ultraviolet radiation, limited to mono-substitution knowledge of reaction mechanisms is not required

Takardar Darasi

Open a gas tap in a chemistry lab and you release methane, the simplest alkane. Fill a car with petrol and you are pouring a blend of alkanes with seven to ten carbon atoms. These molecules share a common trait: every carbon-carbon bond is a single bond. That one fact determines their formula, their shape, and most of their chemistry.

Akwai a cikin manhajar Green Bridge

Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.

Cikakkiyar bayanan darasi tare da zane-zane

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Yi karatu ba tare da intanet ba, a kowane lokaci, a ko'ina

Zazzage manhajar wayar hannu Zazzage manhajar kwamfyuta

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Nazarin Darasi

Barka da kammala darasi akan Alkanes. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

What is the general formula for alkanes? A) CnH2n B) CnH2n+2 C) CnH2n-2 D) CnH2n+1OH Answer: B
How many hydrogen atoms does pentane (C5H12) have? A) 10 B) 11 C) 12 D) 14 Answer: C
Alkanes are described as saturated because they: A) Dissolve in water B) Contain only single C-C bonds C) Contain double bonds D) React with all reagents Answer: B
What condition is needed for methane to react with chlorine? A) Heat B) A catalyst C) Ultraviolet radiation D) High pressure Answer: C
The reaction of an alkane with a halogen in UV light is an example of: A) Addition B) Substitution C) Neutralisation D) Decomposition Answer: B