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chemistry > C7 20 Questions > Flashcards

C7 20 Questions Flashcards

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1
Q

What is a hydrocarbon?

A

A substance with molecules that contain only carbon and hydrogen atoms.

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2
Q

How many bonds does a carbon atom form?

A

Four

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3
Q

Name the first four alkanes

A

Methane, Ethane, Propane and Butane.

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4
Q

What is the general formula of an alkane?

A

CnH2n+2

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5
Q

Why are alkenes more reactive than alkanes?

A

Because they contain at least one C=C double bond (they are unsaturated), so they have the capacity to make further bonds.

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5
Q

What is the chemical formula for propane?

A

C3H8

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6
Q

How does the boiling point change with the length of an alkane?

A

The longer the alkane molecule, the higher its boiling point.

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7
Q

Write the balanced symbol equation for the complete combustion of methane.

A

CH4 + 2O2 → CO2 + 2H2O

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8
Q

Complete the equation for the cracking of octane: C8H18 → C6H14 + …………..

A

C2H4

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9
Q

Pentene has five carbon atoms. Give the formula of pentene.

A

C5H10

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9
Q

Explain how a sample of butane can be told apart from a sample of butene.

A

Add bromine water and shake. Butene is an alkene and decolourises the bromine water (from orange to colourless). Butane does not react so it stays orange.

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9
Q

Why do alkenes burn with smoky flames?

A

Alkenes burn with a smokier flame due to incomplete combustion.

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10
Q

What is the ideal temperature range for the fermentation of glucose?

A

25oC to 50oC

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11
Q

Give the formula of the fourth member of the homologous series of alcohols.

A

CH3CH2CH2CH2OH or C4H9OH

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12
Q

Give the formula of the fourth member of the homologous series of carboxylic acids.

A

CH3CH2CH2COOH or C3H7COOH

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13
Q

Name the products of the complete combustion of ethanol.

A

Carbon dioxide and water

14
Q

Name the addition polymer formed when lots of styrene monomers join together.

A

Polystyrene

15
Q

What is a diol?

A

A molecule with two hydroxyl (OH) groups

16
Q

Name the type of reaction used to produce polyesters.

A

Condensation polymerisation

17
Q

Name the bond between the carboxyl groups and the amino groups formed when amino acids join together.

A

Peptide link

chemistry (6 decks)

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