Activity 8

Activity 8: Exploration of Chemistry
For activity 8, students have a choice to explore other topics of chemistry presented in the PhET simulations.
Tasks to be completed:
1. Choose any Teaching Idea from any of the Chemistry Simulations (http://phet.colorado.edu/en/simulations/category/chemistry ) and post your results/data and/or answers on your blog.

pH Scale Simulation

Go to my website and click

on the link to get to this

Simulation. Click Run, and

follow the procedure below.

1)         You need to get familiar with adjusting the amount of liquid in the beaker. Choose water from the pull down menu. Fill and drain the water using the faucet knobs above and below the beaker. Try to get 0.5 L of water in the beaker. Using the slide arrow, adjust the flow. Play for a bit! Be sure to click the box shown.

2)         Using the pull-down menu, change the contents of the beaker to “water”.

What is the pH? __7.00______

Record and compare (concentration mol/L) H₃O⁺/OH^- ratio.

Both are 1.00 x 10^-7

3)         Fill the beaker with drain cleaner.

What is the pH? __13.00______

Record and compare (concentration mol/L) H₃O⁺/OH^- ratio.

H₃O⁺ =1.00 x 10^-13

OH^-  = 1.00 x 10^-1

4)         Fill the beaker with soda.

What is the pH? __2.50______

Record and compare (concentration mol/L) H₃O⁺/OH^- ratio.

H₃O⁺= 3.16 x 10^-3

OH^-= 3.16 x 10^-12

5)         Using “custom liquid”, adjust the pH level to 6.00. How does the H₃O⁺/OH^- ratio differ from a pH of 7?

Record and compare (concentration mol/L) H₃O⁺/OH^- ratio.

With a pH of 6, H₃O⁺/OH^- are both 1.00 x 10^-6. With a pH of 7, H₃O⁺/OH^- are both 1.00 x 10^-7.

6)         Again, using “custom liquid, adjust the pH level to 8.00. How does the H₃O⁺/OH^- ratio differ from a pH of 7?

Record and compare (concentration mol/L) H₃O⁺/OH^- ratio.

With a pH of 8, H₃O⁺ is 1.00 x 10^-8 and OH^- is 1.00 x 10^-6. With a pH of 7, H₃O⁺/OH^- are both 1.00 x 10^-7.

7)         Alright…let’s mix some acid items with water to see what happens to the H₃O⁺/OH^- ratio!

8)         Fill the beaker with coffee (pH 5.0). Drain out half, and replace that amount with water. What is the new pH? ___5.30_____

 Record (concentration mol/L) H₃O⁺/OH^- ratio.

H₃O⁺ =5.01 x 10^-6

OH^-=2.00 x 10^-9

9)         OK, feeling nauseous? Fill er’ up with Barf!(pH 2.0) Drain out half, and replace it with H₂O!

What is the new pH?__2.31______

Record (concentration mol/L) H₃O⁺/OH^- ratio.

H₃O⁺= 4.90 x 10^-3

OH^-= 2.04 x 10^-12

10)       Let’s get back to “basics”. LOL.  Fill up with hand soap, drain half, and replace with water.

What is the new pH? __9.70______

Record (concentration mol/L) H₃O⁺/OH^- ratio.

H₃O⁺= 2.00 x 10^-10

OH^-= 5.01 x 10^-5

11)       What do you notice about the H₃O⁺/OH^- ratio when you add water to either an acid or a base? Hmmm….refer to how the mol/L changes.

When you add water to an acid, the pH goes up. When you add water to a base, the pH goes down.

12)       Calculate: Add anything to the beaker. Using your scientific calculator, find the negative logarithm (-log) of H₃O⁺ mol/L. This should match the pH value given. 

Blood pH=7.40

-log(3.98 x 10^-8)=7.40

13)       Calculate: Add anything to the beaker. Using your scientific calculator, find the negative logarithm (-log) of OH^- mol/L. This should match the pOH value given. 

Batter acid pH= 1.00

-log(1.00 x 10^-13)=13

2. Work with any of the Chemistry Simulations to create your own Teaching Idea. The criteria for this is as follows:
Enter the Build an Atom simulation at: http://phet.colorado.edu/en/simulation/build-an-atom
Begin the simulation. Make sure to click on all 3 green plus signs on the right-hand side in order to see the details. Choose and create 5 elements each from a different group (i.e. Halogens, Noble gases, etc.).
For each element:
Take screen shot of atom made with simulation.
Determine atomic number, mass number, and group they belong to.
Answer the following questions:
1. How do you change an atom from neutral to ionic?
2. What makes an atom stable/unstable?
3. Explain the differences in charge and location of protons, neutrons, and electrons.
4. How would you create an isotope?
Click on the Game tab in the upper left. Play the Game starting on Level 1 and working your way up to Level 4. Take a screen shot of your score after each level. Use this game to figure out what you need to study more and ask more questions about.
C.8.2 Identify data and locate sources of information including their own records to answer the questions being investigated
C.8.5 Use accepted scientific knowledge, models, and theories to explain their results and to raise further questions about their investigations
C.8.8 Use computer software and other technologies to organize, process, and present their data