1.
Friday, May 10th, 2013 Agenda
1. Announcements – 5 min
2. Warm-up – 10 min
3. Acid/Base Wrap-up – 30 min
4. Acid/Base Assessment – 20 min
5. Project work time – 45 min
Homework: project HW. Acids/Bases quiz on
Tuesday.

2.
4th
Period Announcements
Hello 4th
period. I have graded your lab packets
and your debate worksheets which were out of
50. I'm pleased to say the class average on the
debate worksheet was about 45. Today, please
be on your best behavior as we finish up acids
and bases and work on our project. We will spend
more time on it Tuesday and I will be checking in
with each group to make sure you are on track.
Have a great day!
-Mr. Lee

3.
Warm-up (5 min to answer, 5 min
to discuss)
Please answer the following questions in your
interactive notebook:
1) What do you think would happen if you mixed
an acid and a base together?
2) Carbon Dioxide reacts with water to form a
weak acid. Increased amounts of CO2 in our air is
dissolving into the water in our oceans. What
effects do you think increasing acidity of ocean
water has?

4.
Notes
We will answer the warm-up questions and more
through the next several slides. For now, please
set up your Cornell notes with the
Focus Question: What are acids and bases? Why
does the indicator change colors?
Please copy notes in green

5.
Part 1/3: Lap Recap
What we should have seen in the lab on Tuesday
was the colors changing as we added stronger
acid and base solutions
scoops of citric acid color ph
0 Green 7
1 Yellow-green 6.5
2 Yellow 6
3 Light orange 5.5
4 Peach 5
5 Pink 4

6.
Reason: The more citric acid you add to the 5ml
of water, the more concentrated with acid it
became.
Concentrated: describes the amount of
solute in the solution

7.
A solution includes a solute and a solvent
A solute is what is dissolved
A solvent is what does the dissolving
When you add alka-seltzer to a cup,
the alka-seltzer is the solute,
the water is the solvent,
and the resulting drink is a solution

8.
For the basic (sodium carbonate solution), you
should've seen the colors become darker
Number of scoops Color pH
0 Green 7
1 Green-blue 8
2 Blue 8.5
3 Blue-purple 9
4 Purple 9.5
5 Purple 10

9.
Question: What happened to the concentration of
the basic solution as you added more sodium
carbonate?

10.
Part 2/3: Water
Why did the indicator molecule change color in
the first place? Well first, we have to take a look at
what the water molecules are constantly doing

11.
You must first know that at any point in time,
water molecules are constantly bumping into each
other and trading H+ atoms, which we call protons

12.
H20 molecules bump into each other and one
molecule takes a H+ from the other molecule

13.
Afterward, the molecule that received the extra H+
gives it back to the other molecule, returning them
both to H20. This back-and-forth happens so that
there are an equal # of H3o+ and OH- ions

14.
Play this animation
http://www.middleschoolchemistry.com/multimedi
a/chapter6/lesson8#proton_transfer

15.
Water molecules bump into each other and trade
protons, changing between H20 molecules and
H30+ and OH- ions

16.
Gravy? Now, let's learn the definition of acids and
bases
Acid: a substance that donates H+ ions into the
solution
Base: a substance that accepts H+ in the solution

17.
So when an acid is added to a solution, more H+
are added. Therefore, it increases the number of
H3o+ molecules in the solution.
A base accepts H+ ions, so there will be more
OH- ions in the solution.

18.
Think-Pair-Share
Mid-way quiz. Discuss with your elbow partner
and Ms. Esparza will choose 3 students to answer
1) What 2 molecules do H20 molecules constantly
change into?
2) What atom do the H20 molecules trade?
3) When you add a base to a solution, what
happens?

19.
1) H20 molecules change into H30+ and OH- ions
2) H20 molecules trade the H+ atom
3) A base accepts H+ ions and increases the
amount of OH- ions in the solution

20.
Part 3/3: Indicator molecule
So why does this change the color?
An indicator molecule is a special molecule that
changes color depending on the amount of H3O+
and OH- ions in the solution.
If the amount of H30+ and OH- are balanced, it
will stay green
If there are more H3O+ molecules than OH-, it will
accept the extra H+ ions and change from green
to yellow to red
If there are more OH- molecules than H30+, it will
donate a H+ to the water molecules and change
from green to blue to purple

21.
Watch the animation:
http://www.middleschoolchemistry.com/multimedia/ch
H3O+ > OH- : lowers the pH
H30+ < OH- : raises the pH
H30+ = OH- : pH = 7

22.
Gravy? Ok an additional point
When acids and bases combine, they will
neutralize each other. Which means if you mix a
basic (blue) solution with an acidic (yellow)
solution, it will return to green with the indicator
If either the base or acid is a little stronger, the
color will shift more to that side

23.
Why it's important
Carbon Dioxide can react with water to create a
weak acid.
The increasing Carbon Dioxide in our air from
global emissions is dissolving into our ocean
water and creating more acidic ocean water.
This leads to coral bleaching, which can lead to a
chain reaction of events...more on this next week

24.
Assignment: 20 min. 25 points
Complete one of the following in your interactive
notebook
1: Draw a picture and provide a 5+ sentence
explanation of what made the solutions in our lab
change color.
2. Draw a comic that also explains how color
changes in an indicator solution based on whether
acids/bases are present

25.
Project: Due at end of period and
HW
Here is what's due for each of the 4 types of
projects. Please write down what is due for
your specific project.
Your work today is worth 50 points. Please be
forewarned that I will be very tough on grading the
work you turn in today.
Your homework assignment is worth an additional
20 points

26.
Children's Book groups
Due at end of period: Draft of 10 pages that you
will have in your book, complete with illustrations
HW: bring in a children's book for next Tuesday

27.
Presentation groups
Due at end of period: You must have a skit,
poster, or powerpoint prepared. Create a rough
draft/script of this. Write a 1-page summary of
what you intend to teach students.
HW: 1-page per student on research they have
done on their topic.

28.
Science Project groups
Due at end of period: Written summary of your
Question, Hypothesis, Experiment, Materials. Also
explain what type of graph you will use to show
your results, and what physical object you will
bring to present
HW: find samples of science projects online and
print and bring one to class per group

29.
Lesson Plan groups
Due at end of period: Rough draft of powerpoint
(draw/outline on paper what you will have on the
slides), overhead sheets, quizzes, and handouts
you will use for the lesson.
HW: Think of a teaching strategy or method used
by your current or past teachers that you liked.
Choose one and write half a page on how you
could implement it into your lesson (1 per person)

30.
Sign-up sheet
Ms. Esparza will put up a sign up sheet for your
project. I will start to meet with teachers to set up
times for you to present your presentations and
children's books. Lesson plans and science
projects will be presented in our class.
Please fill out your names, project you have
chosen, how it relates to science, and what age
group you are creating the project for

31.
Participation
Lastly, Ms. Esparza will be keeping track of those
who are and are not off task. You can earn 20
points for participation and she will award you with
them on her discretion.
Have fun and use your time wisely!