1. Draw an atom of silicon (atomic number = 14)
2. How many protons are in the nucleus of an atom of gold?
(atomic number 79)
3.2 Water and Solutions (top right side)
Learning Objective: I can describe the unique properties of water and why it is an essential compound for the survival of all living things.
To demonstrate some of the unique properties of water, we will do the pH Cabbage Lab ("Telltale Cabbage") 30pts.
This is due by the end of class today.
1.On your lab sheet, write down definitions of acid and base.
acid - compound that forms extra hydronium ions when dissolved in water; numbers 0-6 on the pH scale.
base - compound that forms extra hydroxide ions when dissolved in water; numbers 8-14 on the pH scale.
(depending on the amount of extra ions, the solution will either be less acidic, less basic, or neutral/7.)
pH stands for "potential hydrogen." Acids (0-6) have a higher concentration of hydrogen, and bases (8-14) have a higher concentration of hydroxide.
Watch this video to see what we will be doing in our lab.
On the back of your lab sheet, copy data table & diagram!
Use color and arrange the solutions in order to form your own pH scale from 0 to 14.
Photo results here for lab!
Click here for more info on pH ...
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