Deflection of an electron in a magnetic field

07/31/2021 2

Deflection of an electron in a magnetic field Consider an electron entering a uniform magnetic field of flux B, at right angles to its direction ... Read More

Experimental evidence for quantum theory

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Experimental evidence for quantum theory Photoelectric effect: To liberate an electron from a metal surface, a quantum or packet of energy called the work function ... Read More

Photocells

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The Photocells Photocells change radiation into electric current. In their construction, the anode is made thin so that it does not obstruct the incident radiation ... Read More

Photoelectric emission effect

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Photoelectric emission effect In metals, atoms exists as positive ions in a sea of electrons. An electron near the surface of the metal, say A, ... Read More

Geometrical optic (light) revision questions and answers

07/17/2021 0

Geometrical optic revision questions and answers 1. (a) (i) derive the relationship, for convex lens, where u is the object distance, v is the image ... Read More

Waves A-level revision questions with answers

07/13/2021 0

(a) What is meant by interference pattern as applied to waves. (03marks) When two sound waves meet they superpose. The interference pattern produced depends on ... Read More

Magnetism (A-level revision questions with answers)

07/11/2021 0

1. (a)(i) Write down an expression for the force on a charge, q coulombs moving with velocity, u, at an angle, α, to a uniform ... Read More

Preparation of alkenes from tertiary alkyl halides

07/10/2021 0

Tertiary alkylhalides in presence of  hot solution of  excess alcohol and  potassium hydroxide undergo elimination reaction to form alkenes. The mechanism is described as  E1 ... Read More

Preparation of alkenes from primary alkyl halides

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Preparation of alkenes from primary alkyl halides Primary alkyl halide react with hot solution of excess alcohol and potassium hydroxide to form alkenes. the mechanism ... Read More

Preparation of alkenes from tertiary alcohols

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Preparation of alkenes from tertiary alcohols Tertiary alcohols react with hot concentrated sulphuric or phosphoric acid to  give alkenes. The mechanism is described as E1 ... Read More

Preparation of alkenes from primary alcohols

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Primary alcohol react with hot concentrated sulphuric or phosphoric acid to form alkenes. The mechanism is referred to as elimination bimolecular(E2) because water molecule is ... Read More

Polymerization of dienes

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Polymerization of dienes Alkenes with conjugated double bond undergo polymerization to form polyalkenes with double bonds Example Please Subscribe to promote this website. Subscription is ... Read More

Polymerization of alkene

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Polymerization of alkene This is the is the joining of very many small molecules called monomers to form big molecules called polymers In presence of ... Read More

Ozonolysis (reaction of ozone with alkenes)

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Ozonolysis (reaction of ozone with alkenes) Ozone reacts with alkene to form unstable ozonide that is reduced by zinc in presence of hydrochloric acid to ... Read More

Reaction of alkenes with hydrogen bromide in presence of a peroxide

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Reaction of alkenes with hydrogen bromide in presence of a peroxide In presence of a peroxide, alkenes react with HBr by free radial mechanisms; but ... Read More

Reaction of alkene with water

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Reaction of alkene with water. The reaction is catalyzed by  an acid sulphuric acid or phosphoric acid. Alcohols are produced Example 1 Ethene reacts with ... Read More

Reaction of alkenes with halogens in presence of water.

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Reaction of alkenes with halogens in presence of water. The reaction is carried out by bubbling alkenes through aqueous halogens. Example  Propene reacts with chlorine ... Read More

Reaction of alkenes with hydrogen halides (HX ; X = Cl, Br, I)

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Reaction of alkenes with hydrogen halides (HX ; X = Cl, Br, I) The reaction is carried out by bubbling HX through alkenes. Example 1 ... Read More

Reaction of alkenes with halogens

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Reaction of alkenes with halogens Halogens add across a double bond to form dihalogeno compounds. The reaction is carried out in an inert solvent like ... Read More

Reaction of alkenes with alkaline KMnO4 (potassium manganate) (VII) solution

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Reaction of alkenes with alkaline KMnO4 solution Dilute alkaline KMnO4 solution convert alkenes into compound called GLYCOLS (dihydroxyl alcohols) Please Subscribe to promote this website. ... Read More

Reduction of alkenes

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Reduction of alkenes They are reduced by hydrogen in presence of catalysts; nickel or platnum  to alkenes Example Please Subscribe to promote this website. Subscription ... Read More

Rules for naming alkanes or nomenclature of alkanes

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(a) Names of straight chain isomers alkanes Straight chain isomers are named according to the number of carbon atoms in the chain. (a) Naming branched ... Read More

What is alkyl groups?

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An alkyl group is an alkane less one hydrogen atom. Examples CH4                       Methane        CH3- methyl  group CH3CH3                Ethyl        ... Read More

Names of first ten straight chain alkanes

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Names of first ten straight chain alkanes Please Subscribe to promote this website. Subscription is free Share with a friend Your comment is valuable Thank ... Read More

Types of Isomerism in organic chemistry

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Types of isomerism Structural isomerism Optical isomerism Structural isomerism Here compounds differ in arrangement of atoms in a compound. (a) Chain isomerism: compound have the ... Read More

What is isomerism?

07/09/2021 0

what is isomerism? Isomerism is the existence of compound with the same molecular formulae but different arrangement of atoms in a compound. Please Subscribe to ... Read More

Dehydration of alcohol

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Dehydration of alcohol Alcohols are dehydrated by hot concentrated sulphuric or phosphoric acid to form alkenes. The mechanisms depend on the class of alcohols. Primary ... Read More

Oxidation of alcohols

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Oxidation of alcohols Alcohols are burnt in oxygen to produce carbon dioxide, water and heat. Due to production of heat on combustion, alcohols are used ... Read More

formation of alkylhalides from alcohols

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Formation of alkyl halides from alcohols Alcohols react with a variety of reagents to yield alkyl halides. The most commonly used reagents are hydrogen halides ... Read More

Reaction of alcohols with acid anhydride to form esters.

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Alcohols react with acid anhydride to form esters Example Please Subscribe to promote this website. Subscription is free Share with a friend Your comment is ... Read More

Reaction of alcohols with acid halides to form esters.

07/09/2021 1

Acid halides react with alcohols to form esters. Example Ethanoyl chloride reacts with methanol to form methylethanoate Please Subscribe to promote this website. Subscription is ... Read More

Reaction of alcohols with carboxylic acids to form esters

07/09/2021 0

Alcohols react with carboxylic acids in the presence of a mineral acid (phosphoric or sulphuric acid) to form esters. However, this is not a good ... Read More

Formation of ethers from alcohols

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Please Subscribe to promote this website. Subscription is free Share with a friend Your comment is valuable Thank you so much Read More

Laboratory preparation of alcohols

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  Please Subscribe to promote this website. Subscription is free Share with a friend Your comment is valuable Thank you so much Read More

Industrial preparation of alcohols

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  Please Subscribe to promote this website. Subscription is free Share with a friend Your comment is valuable Thank you so much Read More