Addition Reactions of Alkenes Flashcards

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What is meant by an addition reaction of an alkene?

An addition reaction is when new atoms add to the carbon–carbon double bond of an alkene to make one larger molecule.

Why can alkenes take part in addition reactions but alkanes usually cannot?

Alkenes have a carbon–carbon double bond that can open up and add new atoms. Alkanes only have single bonds and are less reactive.

What happens to the C=C double bond in an alkene during an addition reaction?

The double bond breaks open and becomes a single bond, and new atoms join onto the two carbon atoms.

Compared with the original alkene, how does the size of the product molecule change in an addition reaction?

The product molecule has more atoms than the original alkene, because extra atoms have added across the double bond.

What are the reactants and product in the addition reaction between ethene and hydrogen?

Ethene and hydrogen react together to form ethane, which is a saturated alkane.

What is the name of the addition reaction where an alkene reacts with hydrogen to form an alkane?

This type of addition reaction is called hydrogenation.

What type of product is made when an alkene reacts with bromine in an addition reaction?

A molecule with two bromine atoms is made, called a dibromoalkane.

What is the word equation for the addition reaction of ethene with bromine?

Ethene + bromine → dibromoethane.

What product forms when ethene reacts with steam in an addition reaction?

Ethene reacts with steam to form ethanol, which is an alcohol.

What conditions are needed for ethene to react with steam to make ethanol?

The reaction needs high temperature and pressure and a phosphoric acid catalyst.

How does an addition reaction change an unsaturated hydrocarbon into a saturated one?

Atoms add across the double bond so that only single bonds are left between the carbon atoms, so the molecule becomes saturated.

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