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chemistry gcse > sc22 > Flashcards

sc22 Flashcards

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1
Q

What is the general formula for alkanes?

A

Cn H2n+2

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2
Q

Why are alkanes saturated?

A

They don’t contain C=C double bonds

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3
Q

What is the general formula for alkenes?

A

Cn H2n

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4
Q

Why are alkenes unsaturated hydrocarbons?

A
  • contain at least one C=C double bond
  • has hydrogen and carbon carbons only
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5
Q

What is the test for alkanes/alkenes?

A
  • alkenes react with bromine water as it has a double bond turning it colourless
  • alkanes don’t react leaving it orange
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6
Q

What is the reaction for the complete combustion of alkanes/alkenes?

A

Alkane/alkene + oxygen —> CO2 + H2O

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7
Q

What happens in addition reactions?

A

double bond in alkene breaks and the other molecule joins to its bonds

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chemistry gcse (12 decks)

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