Exercises about Physical Properties of Alkane

C₆H₁₄ has 5 isomer as we can see from the picture. Which compound has the higher boiling point?

• n-hexane

• isohexane

• neohexane

• 2,4-dimethylbutane

• 3-methylpentane

Propane and butane are compounds with straight chain and usually used as the heating fuels. Between Propane and Butane which compound has lower boiling point?

• Propane, because it has higher molecular mass than butane

• Propane, because has more carbon and hydrogen

• Propane, because has lower molecular mass than butane

• Butane, because it has more isomer

• Butane, because it has higher molecular mass than propane

Arrange the compound based on their boiling point from higher to lower

1) nonane

2) propane

3) ethane

4) decane

5) pentane

• 4,1,5,2,3

• 2,3,5,4,1

• 1,4,5,2,3

• 3, 2, 5, 1, 4

• 5, 1, 3, 4, 2

what will happen if we mix 75 ml octane with 25 ml water on the beaker glass?

• Octane will not dissolve in water, and will float on top

• Octane will soluble in water

• Octane will not dissolve in water, and will sink to the bottom of the beaker glass

• Octane will evaporate

• Octane will change its colour

The boiling points of branched alkane is higher than straight alkane with same molecular mass

• True

• False

Why do alkane not dissolve in water?

• they are less dense than water
• they have low melting points
• they are non-polar compounds 
• they are chemically less reactive

Which statement is correct about the phase of alkane?

• C₂H₆ is a solid

• C₁₁H₂₄ is solid

• C₄H₁₀ is a gases

• C₁₉H₄₀ is a liquid

• C₈H₁₈ is a gases

If Boiling point of n-hexane is 65 ⁰C, the boiling point of n-undecane is about (a)   ⁰C

This compound is polar (Electronegativity value of H=2,20 ; O = 3,44, C=2,55)

• True
• False

Which statement is not true about density and solubility of alkane

• Hexane has higher density than water

• alkane with longer carbon chain are insoluble in water

• the density of alkane is about 0,6-0,7 gr/ml

• hexane is soluble in non polar solvent, such as benzene, CCl4

• if we mix octane with water, it will float above the water