experiment 3-4 experimentation

Question 1

When polyethylene is rubbed with wool/silk, what can be observed in:

1. water
2. ethanol
3. vegetable oil

Answer 1

1. water (polar)
   WOOL: attract
   SILK: attract
2. ethanol (weaker polarity)
   WOOL: weak attract
   SILK: weak attract
3. vegetable oil (non polar)
   WOOL: no attraction
   SILK: no attraction

Question 2

Why do ATTRACTION or REPLUSION happen

Answer 2

due to polar (dipole-dipole) bonds

Question 3

Effect of DETERGENT on IMFA

Answer 3

Lowers the surface tension of water
The detergent has a polar hydrophilic head and a nonpolar hydrophobic tail

Will squeeze between the water molecules on the surface, pushing their hydrophobic ends out of water

Question 4

In which state does a sample exist at its freezing point

Answer 4

solid-liquid state

Question 5

will increasing the amount of solute affect the freezing point of a solution

Answer 5

no kasi colligative property