What is physical state of pentane at room temperature and atmospheric pressure 1 atm?

• gases

• solids

• liquids

The alkane in following group with the highest boiling point

• methane

• ethane

• propane

• butane

select the substance that you expect to have the higher boiling point

• octane

• nonane

• butane

• tetramethylbutane

If 25 ml of hexane were added to 100 ml of water in a beaker, which of the following would you expect to happen?

• hexane would dissolve in water

• hexane would not dissolve in water and would float on top

• hexane would not dissolve in water and would sink to the bottom of the container

• not all above

For which member of each pair is hexane a good solvent?

• pentane

• water

• hot water

Why the boiling point is higher ,when the molecular mass is bigger ?

• More energy required to separate molecules from one another

• less energy required to separate molecules from one another

• energy is not required to separate molecules from one another

arrange the following alkanes in decreasing ( < ) order of boiling points

• decane > 2,2-dimethylpropane < 2-dimethylpropane > decane

• 2,2-dimethylpropane > decane > pentane > 2-methylpropane

• decane > pentane > 2,2-dimethylpropane > 2-methylpropane

• pentane > decane > 2,2dimethylpropane > 2-methylpropane

is alkanes soluble in water ?

• insoluble in water

• soluble in water

which of the following is not the characteristic of chain branching ?

• lower boiling point

• the strength of the London dispersion / Der Waals forces reduce

• surface area increase

Which of the following has the higher boiling point for alkane

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