Chem 30 Ch 9 Review

Match the following:

Groups:

(a) CnH(2n+2)

,

(b) CnH2n

,

(c) CnH(2n-2)

,

(d) All of the above

• cyclo alkene

• alkane

• alkyne

• cyclo alkane

• low solubility

• alkene

• aliphatic

• diene

• saturated

Label the diagram.

a

b

e

crude oil

oil sand

most soluble

longest chains

least soluble

shortest chains

Label the diagram.

a

b

c

d

highest boiling point

gasoline

motor oil

lowest boiling point

Are the following molecules considered organic or inorganic?

Groups:

(a) organic

,

(b) inorganic

• NaCN

• C₂H₅OH

• CO₂

• CH₃Br

• C₄H₈O₂

• CH₃COOH

• H₂SO₄

• HCO₃

Which of these molecules is an isomer of nonane?

• i

• ii

• iv

• v

• none of the above

Answer explanation

Remember that each corner and end is a carbon.

Isomer have the same chemical formula, but different structures.

Which of these molecules is 2,4-dimethylhexane?

• v

• vi

• vii

• ix

• none of the above

Answer explanation

Number from the side closest to the branches.

Choose the correct name for this molecule.

• 2-ethyl-4-methylhexane

• 3,5-dimethylheptane

• 4-ethyl-2-methylhexane

• 3-methyl-5-ethylhexane

Answer explanation

The longest chain has 7 carbons, so this is a dimethylheptane.

What can you do to decrease the amount of carbon monoxide produced by a fire.

• add more oxygen

• decrease the temperature

• add more fuel

• protect it from air currents

Answer explanation

To decrease CO, you need to have more complete combustion. Complete combustion occurs in the presence of adequate oxygen.

Which of the following does NOT describe this molecule?

• aromatic molecule

• high solubility in water

• toxic

• C₆H₆

Name the following molecule.

• 5-ethyl-2,3-dimethylhept-4-ene

• 2,3-dimethyl-5-ethylhept-4-ene

• 5,6-dimethyl-3-ethylhept-3-ene

• 3-ethyl-5,6-dimethylhept-3-ene

Answer explanation

Fid the longest chain that includes the double bond. Number closest to the double bond. List branches in alphabetical order.