Polarity
A liquid that acts as a universal solvent
Water
What materials are needed for this Experiment
A Dish, Milk, Food Coloring, Soap, Q-tip/Toothpick
What Nation did this Technique originate from
Japan
What does the Jesus Lizard use when it runs across water?
Surface Tension
What do opposites do?
Attract
What is Polarity?
When an atom has a partial negative charge on one side and a partial positive charge on the other side
Inside the milk, Do the water molecules and milk molecules mix before the soap?
No, they clump together with similar molecules.
What holds the paints on the water
Surface Tension
What is the significance of the hairs on a Water Strider's leg's
The hairs allow the Water Strider to be above the water and they do not break the surface
Are All water droplets the same size
No, so are much bigger than others.
Polarity is caused by a difference in ____ between atoms in a molecule
Electronegativity
What does the Soap do in this experiment?
The soap mixes the water molecules with the milk
What type of paper works best for this project
Any Paper that can absorb water
Name 3 Animals that take advantage of surface tension
The Water Strider
The Whirlgig Beetle
The Jesus Lizard (The green basilisk lizard)
Define Surface Tension
The measure of the elastic force in a liquid's surface
Why is water Cohesive
The polarity allows for the oxygen atoms to attract to hydrogen atoms of other molecules and hydrogen attracts to other oxygen molecules, forming a tightly bound structure
What does the food coloring attach to
The fat globules inside the milk
Why might you add soap to the paints
So you can create a unique design in a firework like pattern
How does the Water Strider Catch it's prey?
It senses the vibrations on the surface of the water made by insects
Define Cohesion and Adhesion
Cohesion: A substance's ability to stick to itself
Adhesion: A substance's ability to stick to other materials
How does Electronegativity the covalent bonding between hydrogen and oxygen
Oxygen has a higher electronegativity so it is pulling on the hydrogen's electrons more than hydrogen pulls on oxygen
This results in ions forming. When the ions form they attract to each other because of their different charges
What is the chemical name for the soap in this expirement
A Surfactant
What is the definition of Suminigashi
"Ink Floating"
Where might you see a Water Strider in nature
Stagnant or Slow moving water because it can move more easily on the surface and will not break the surface of the water
What Causes Surface Tension?
Since all molecules in a water drop are attracted to each other, the are all held still. On the outermost layer their is a net inwards pull because they are not completely surrounded by water. This causes a small film-like layer of water molecules to form on the surface, rather than in a random formation