Polarity
The two charges that a polar element possesses
What are positive and negative charges?
Does milk have surface tension?
Yes
Mostly water, but some drops of fat, protein, & other nutrients are also present.
What is milk made of?
What allows certain insets to walk on water?
Surface Tension
On a periodic table, are the valence electrons between elements the same within groups of periods?
Groups
The tendency of an atom to attract electrons
What is electronegativity?
Is this reaction a chemical or physical change?
Physical
Who do fat drops in milk tend to stay with?
Other fat drops
Can the insects that walk on water walk on all liquids? Why?
No, the liquid must have a high surface tension for an insect to be able to walk on it.
The smallest building block of matter that still behaves like matter
What is an atom?
Electronegativity differences
How is polarity possible?
Is milk fat a polar molecule?
No
Why does water behave like a magnet does?
In a water molecule, the hydrogen atoms have a positive charge and the oxygen atoms have a negative charge. Since opposite charges attract, the negatively charged side of the water molecule begins to attract to positively charged molecules, and the same happens to the positively charged side of the water molecule, causing it to behave like a magnet
In which direction are molecules at the surface not pulled in?
Upwards, or away from the surface
A substance that is composed of two or more separate elements
What is a compound?
What charge does a polar compound possess?
A neutral charge
Does dish soap break the bonds between surface tension?
Yes
Do fat and water inside milk tend to stay together?
No
What is responsible for the strong surface tension in water?
The hydrogen bonding in water
A bond formed by the transfer of electrons
What is an ionic bond?
How does electronegativity influence polarity?
In a compound, elements that are more electronegative gain more electrons and become more negative.
Why does milk react with dish soap?
Yes
When liquid dish soap is added to milk with drops of food coloring on the surface, the soap reduces the surface tension of the milk and reacts with the fat. This interaction causes the fat particles in the milk to move and create swirls of color.
What refers to the attraction of molecules for other molecules of the same kind?
Cohesion
An effect where the surface of a liquid is strong and will create a film that some objects may not be able to infiltrate.
What is surface tesnion?
Is electronegativity an example of a physical or chemical change?
Physical change