# Chemistry

Chemistry, a branch of physical science, is the study of the composition, properties and behavior of matter.

#Quick facts #chemistry
1. A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.

2. A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions.
Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together in a defined spatial arrangement by chemical bonds. Chemical compounds can be molecular compounds held together by covalent bonds, salts held together by ionic bonds, intermetallic compounds held together by metallic bonds, or complexes held together by coordinate covalent bonds.

3. Calculation for chemical substances
     mass number = number of neutrons + number of protons
     number of protons = atomic number = number of electrons

4. About 25 of the 92 natural element are known to be essential to life. There are four elements of these 25 elements make up approximately 96% of living matter. They are: Oxygen, Hydrogen, Carbon and NITROGEN.

5. A covalent bond is formed when outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms.

6. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed due to the attraction between an atom that has lost one or more electron (known as a cation) and an atom that has gained one or more electrons (known as an anion). Usually, the cation is a metal atom and the anion is a nonmetal atom.

Sources by:
www.wikipedia.org
Mr. Quick's formative quiz #Basic chemistry

Magic? Art? Dancing milk?

Wow! Isn't it amazing?

OMG! What is going on in that plate? Who drew this masterpiece? Well, don't be surprised. This amazing art work is done by a well-known artist, dish soap. Now, let's see how does dish soap create this.

(AKA, dancing milk lab) 

I. Brief info

It's an explosion of color! Some very unusual things happen when we mix a little milk, food coloring, and a drop of liquid soap.

II. Materials

• Milk
• Dinner plate
• Food coloring 
• Dish-washing soap 
• Toothpicks 

III.Procedures

•  Pour certain amount of milk in the dinner plate to completely cover the bottom. 
• Add one drop of each of the four colors of food coloring to the milk. Keep the drops close together in the center of the plate of milk.
• Dip a toothpick into the dish sopa.
• Use the toothpick to place a drop of dish sopa at the center of the plate. Do not stir the mix. 
• Observe and record what happens inside the plate.

IV. Hypothesis

Dish soap is nonpolar that it breaks the bonds between proteins and fats in the milk, and that is the reason why dish soap can draw an amzing artwork in the plate. Food colorings make this rection visible. 

V. Additional info

However, to make sure that dish soap is the real master. Another experiment is demonstrated to prove. 

VI. Procedure for additional experiment 

• Pour water and soy milk in two plates. 
• Add one drop of each of the four colors of food coloring to the milk and the water. Keep the drops close together in the center of the plates.
• Dip a toothpick into the dish sopa.
• Use the toothpick to place a drop of dish sopa at the center of the plate. Do not stir the mix. 
• Observe and record the reaction. 

VII. Expectations

No reactions in the water, and the same result as milk happens in soy milk.

* When testing the result, make sure to repeat the procedures at least three times. If the result remains the same after three times of testing, then draw the conclusion.