Polymer density Quiz

Which solvent has higher density?

• ethanol

• water

What is the density of water?

• 3 g/cm^3
• 1 g/cm^3
• 0.5 g/cm^3
• 2 g/cm^3

Which polymer has higher density?

• HDPE

• LDPE

Which polymer has lower density?

• Expended Polystyrene

• Polystyrene

Which polymer has higher density?

• HDPE

  or PS

• PVC or PLA

Is it possible to calculate the density of a mixture of solvents?

• Yes

• No

How would you separate a polymer with a lower density from a polymer with higher density?

• Choose a solvent which has a density between the two polymer densities then see which polymer floats.

• Choose a solvent which has a density higher than the two polymer densities then see which polymer floats.

• Choose a solvent which has a density lower than the two polymer densitiesthen see which polymer sinks.

• ask the teacher which one has a lower density

Why is it important to stir your solution after putting the piece of solid polymer in it?

• To make sure the polymer doesn't float because of air bubbles stuck on it

• To make the polymer chemically react with water.

• To push the polymer to the bottom of the tube

• It's always good to stir a solution in chemistry

How did you find this polymer density experiment? (several choices are possible)

• Too easy (boring)

• Not bad

• Interesting

• Too complicated or confusing

Do you trust your classmates to identify the right polymers?

• Yes, better than me (it's too hard for me)

• Yes, same as me

• No, not as good as me

• No, same as me (it's too hard for everyone)