REQUIRED CHEMICALS
- oil
- water
- KMnO4., liquid (potassium permanganate)
REQUIRED EQUIPMENT:
- a clean plastic bottle
- a dropper
- a laboratory glass
- a measuring beaker
- a glass rod
PROCEDURE:
STEP ONE : Fill the bottle with 100 mL of water. Take a dropper and add a few drops of KMnO4 and mix it all up.
STEP TWO : Add about 100 mL of oil in the same bottle.
STEP THREE: Tilt the bottle from side to side.
RESULTS:
The water and oil do not mix together, but instead they form layers. The oil floats on the water which makes it move like a wave.
CONCLUSION AND EXPLANATION:
Oil sits on top of water because oil is less dense. The oil and water cannot mix together because water molecules have strong bonds between them called hydrogen bonds. The oil molecules are also held together by bonds, but these are of a different polarity to the hydrogen bonds, and the oil bonds are not strong enough to break the water’s hydrogen bonds. So the water and oil molecules cannot join up, keeping them forever seperate.
Student A (the one in the video) : Lucija Zovko
Student B (the one who filmed the experiment and wrote description) : Anamarija Volf
Student C (the one who uploaded the video) : Mia Marić
Experiment was made by students attending Beginner English at Faculty of Chemical Engineering and Technology, University of Zagreb.
Lecturer: Nađa Dešpalj
Post time: Jan-23-2017