Battery #61

Batteries

#61- An electrochemical cell with half reactions.
- A electrochemical cell is something that gives off energy. Batteries give off energy. In Zn-Cu batteries the two half cells make an oxidizing- reducing couple. Half cells are placing a piece of reactant in an electrolyte solution.
-Cite: http://www.science.uwaterloo.ca/~cchieh/cact/c123/halfcell.html

Milk #21

Milk

#21- Exactly 1.01 mL to the three significant digits of a liquid other then water.
-I used milk, and i measured it out into a test tube and got to exactly 1.01 mL.
-Cite: Notes

Sugar Water #48

Hummingbird food= sugar water

#48- A sugar- water solution which would boil at 101.2 degrees C and 1 atm.
-Hummingbird food is made out of sugar dissolved into water, so its sugar water. I can boil at 101.2 degrees C and 1 atm. To make this I had to boil the water and it got to 101.2 degrees C.
-Cite: Notes/ personal experience

Methane #30

Propane tank

#30- A covalently bonded substance with an accurate description of the shape of the nolecule including cond angles.

-Methane and propane are basically the same thing. Methane is a covalently bonded substance, its formula is CH3OH. Its bond angles are 109.9 degrees and it is shaped like a ball with three sticks coming out of it. Almost like a sun with rays coming out of it. Its bonds are 108.70 pm long. Its apperance is a colorless gas. 

-Cite: http://www.eoearth.org/article/Methane

Oxygen #15

In this picture i was breathing OXYGEN.

#15- A sample of gas labeled with its density at 25 degrees C and 746 Torr. Show calculations.
-I used oxygen and i found its volume.
-Calculations on paper turned into box.
-Cite: Notes

Tar #62

Pavement

#62- A substance composed of nonpolar molecules.
-Pavement is made of tar substances and tar is a nonpolar molecule. Nonpolar molecules is a bond between 2 nonmetal atoms with the same electronegativeity.
-Cite: http://users.stlcc.edu/gkrishnan/polar.html

Neon sign #14

Neon Sign

#14- A sample of gas whose atoms have an average velocity less then that of oxygen atoms. Show calculations.
-Hydrogen is found in neon signs. Hydrogens velocity is less then oxygen's.
-Cite: Notes