IGS Ch Organic Chem - Hydrocarbons

What elements do hydrocarbon molecules contain?

• Hydrogen

• Carbon

• Oxygen

• Bromine

Alkanes are the simplest hydrocarbons.

They have ...

• only C-C single bonds

• a mixture of C-C single bonds and C=C double bonds

• only C=C double bonds

What's the general formula of an alkane?

• C_nH_2n+2

• C_nH_2n

• C_nH_2n+1OH

Alkanes have only C-C single bonds (no double or triple bonds).

What technical term means that "they don't contain double or single bonds"?

• saturated

• unsaturated

• bond-identical

• carboxylic

Which is/are hydrocarbons?

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Which is/are alkanes?

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Alkanes all have C-C single bonds.

Alkanes are a "homologous series".

What does "a homologous series" mean?

• A group of organic compounds that react in a similar way.

• A group of organic compounds that share the same number of carbon atoms.

• A group of organic compounds that share properties that change along the series.

The properties of long-chain hydrocarbons are different those of short-chain hydrocarbons.

Which happen as the chain gets longer?

• More viscous

• Less volatile (higher boiling points (more difficult to boil))

• Less flammable (harder to ignite)

• Less viscous

• More volatile

  (lower boiling points (easier to boil))

How do short-chain hydrocarbons differ from long-chain hydrocarbons?

Short chain hydrocarbons are:

• More viscous

• Less volatile

• More flammable

• Less viscous

• More volatile

Which are used for bottled gases (eg bottles of gas for camping stoves)?

• Long-chain hydrocarbons

• Short-chain hydrocarbons