Fractional distillation

State the general name for this method of separation.

Tags

NGSS.MS-PS1-4

Predict the reading on the thermometer during the separation. _______ °C.

Tags

NGSS.MS-PS1-4

Two samples are taken, one at point A and another at point B. Each is placed in a separate glass evaporating dish and heated to dryness. The sample from A left a white solid and the sample from B left no residue.  Explain the two observations.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A mixture of ethanol (b.p. 78 ^oC) and water (b.p. 100 ^oC) are separated using fractional distillation. Identify the distillate that is first collected.

(Also think about why you made this guess)

• ethanol

• water

Tags

NGSS.MS-PS1-2

The liquid with the _______ boiling point distils first.

• higher

• lower

Tags

NGSS.MS-PS1-4

A mixture of ethanol (b.p. 78 ^oC) and water (b.p. 100 ^oC) are separated using fractional distillation.

When the mixture first boils, what is present near the bottom of the fractionating column?

• only ethanol

• only water

• mixture of equal % of ethanol and water

• mixture with higher % of ethanol

• mixture with higher % of water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Which part of the fractionating column is hotter?

• the bottom

• the top

Tags

NGSS.MS-PS1-4

As the mixture of ethanol (b.p. 78 ^oC) and water (b.p. 100 ^oC) rises through the fractionating column, what condenses back into a liquid?

• ethanol

• water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A mixture of ethanol (b.p. 78 ^oC) and water (b.p. 100 ^oC) are separated using fractional distillation.

When the mixture boils, what is at the top of the fractionating column?

• only ethanol

• only water

• mixture of equal % of methanol and water

• mixture with higher % of ethanol

• mixture with higher % of water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Predict the temperature shown on the thermometer.

• 0

• 65

• 78

• 100

Tags

NGSS.MS-PS1-4