Today 10/26/12
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Transcript of Today 10/26/12
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Period 41. Attendance2. Brainpop on Homestasis3. Notes on Enzymes
TODAY 10/26/12
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Observation is
Using your senses
Taste Hearing Touch Sight Smell
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What is your challenge?
To build the highest tower of spaghetti that will hold a marshmallow at the top without falling down.
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The Details: Teams of four people 18 minutes to plan and build Supplies
20 strands of spaghetti 1 meter of masking tape 1 meter of string 1 marshmallow
We will measure each standing tower.
We will make a graph of the class results and discuss our findings.
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mod
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by D
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from
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20
09
OBSERVATION & INFERENCE
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Observations (I would write this in your notebook.) Any information collected with the senses.
Quantitative – described with numbers 3 meters long 4 marbles 50 kilograms 35 degrees Celsius
Qualitative – described without numbers raptors have keen eyesight smells like fresh baked cookies tastes bitter
The skill of describing scientific events
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Inference
An idea or hypothesis based on observations of a small sampling of data.
Let’s Practice Making an Inference!
(Jot down on your paper) Your Observations:
• I hear people screaming.• I smell cotton candy, popcorn, and hamburgers.• I see a lot of people.
Inference = ?
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Now what do you think?
Make 3 OBSERVATIONS
Make an INFERENCE
Frame 2
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Look at these two sets of animal tracks.
List 3 OBSERVATIONS
Make an INFERENCE
Frame 1
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Now what do you think?
Make 3 OBSERVATIONS
Make an INFERENCEFrame 3
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SOURCE OF GRAPHIC:
HTTP://BOB.NAP.EDU/HTML/EVOLUTION98/EVOL6-E.HTML
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The amount of space an object occupies is called
volume
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The amount of matter in an object is called
mass
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INCREASE YOUR PH I.Q. ASAP
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Goggle It!!
Take a tip from La Mimi…
http://rickie-lee.com/kidz.html
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Increase your pH I.Q. ASAP!
A word from Soren…
http://www.geocities.com/bioelectrochemistry/sorensen.htm
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pH: “pondus hydrogenii” or the “potential to be hydrogen”H: hydrogen
+: charge
H+: hydrogen ion
H3O+: hydronium ion
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pH= -log([H3O+])
pH is the negative log of the
hydronium ion concentration in a liquid
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http://www.ericharshbarger.org/images/office.19980611.jpg
huh
? whaa
?
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Q: What is a simpler way to think of pH?
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Why not make a scale?
http://www.costumeuniverse.com/prodspics/insane_guy.jpg
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Why not make a scale?
http://www.costumeuniverse.com/prodspics/insane_guy.jpg
1 14
7
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Why not make a scale?
http://www.costumeuniverse.com/prodspics/insane_guy.jpg
1 14
7
acid base
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The number is based on the concentration of hydrogen ions
HCl= .01 hydrogen ions= pH 2
NaOH=.0000000000001 hydrogen ions=pH13
Q: How is the pH number related to the ion number?
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THE NUMBER IS BASED ON THE CONCENTRATION OF HYDROGEN IONS:The less hydrogen ion activity in the solution, the more BASE it is:
NaOH=.0000000000001 hydrogen ions= pH13
The more hydrogen ion activity in the solution, the more ACID it is:
HCl= .01 hydrogen ions= pH 2
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How do you measure pH?
http://images.google.com/imgres?imgurl=http://sciweb.hfcc.net/Biology/jacobs/bio131/ph%26meas/phpaper1.gif&imgrefurl=http://sciweb.hfcc.net/Biology/jacobs/bio131/ph%26meas/pH%26measurement.html&h=385&w=305&sz=75&tbnid=S5-AXV1yRXQJ:&tbnh=118&tbnw=94&start=18&prev=/images%3Fq%3DpH%2Bpaper%26hl%3Den%26lr%3D%26ie%3DUTF-8%26sa%3DG
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Your hypothesis: What do you think the pH of each solution is?
1 2 3 4 5 6 7 8 9 10 11 12 13 14
•Lay down a strip of masking tape on your bench
•Evenly space the numbers from 1-14
•Place the labeled index card where you think the pH of each solution will be
•Record your hypothesis in the chart in your handout
Something
you think is
4.7
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Test the actual pH of your solutions:
•Dip the test strip in for 5 seconds, then remove it and compare it to the scale on the test strip box.
•Record your results!!
Put used test strips on a paper towel, then throw them all in the garbage
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Make your spice solution:
1) Write a good quantitative statement of how you are going to prepare your spice solutions. Numbers, amounts, brand names, how long to
stir, temperature water, type of water, amount of water.
2) When okay by teacher: prepare your spice solutions and soak one little disk in each Carefully use the big pin to get the little disk
out of the cup and into the solution3) Sit back down for the next bunch of instructions
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Putting your bacteria on the new petri dish. Get new plate. One per person. Put your name
on the bottom in small letters near the edge. Write the numbers 2,6, and 10 on the back of
the dish where they would be if it was a clock. Dip a q-tip in the sterile water and slide along
your own bacteria culture. Slide back and forth like the diagram shows. Do not dig in the agar.
Spread your germs all over the new plate. Do not dig in the agar.
Close the lid and sit down for further instructions
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Putting the disks in the petri dish and labeling your answer paper. Carefully use the pin to transfer the disk
soaked in spice solution to next to a number on your petri dish.
Make a key on your answer paper of which number has which spice.
Rinse the pin off between uses. Continue until all disks are on your petri
dish. Close the cover, turn upside down, and
then sit in your desks!
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The scientific method
1. Problem – question you are trying to figure out.
2. Hypothesis – your educated guess as the result. State it as If…..then….
3. Perform the experiment.1. Use quantitative statements to design
the experiment.2. control group – a group that you are
studying that is not being tested. You are supposed to compare the results with the control group.
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Scientific Method continued Performing the Experiment continued
4. Variable – the characteristic of the experiment that can
changeIndependent variable – the
variable that is being manipulated (changed around – tested) in the experiment
Dependent variable – the variable that is the result that is measured after the factExample: I change the amount of sunlight that plants receive to see if it changes how tall the plants will grow.
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Your hypothesis: What do you think the pH of each solution is?
1 2 3 4 5 6 7 8 9 10 11 12 13 14
•Lay down a strip of masking tape on your bench
•Evenly space the numbers from 1-14
•Know what numbers are acidic, neutral or a basic
•Place the labeled index card where you think the pH of each solution will be
•Record your hypothesis in the chart in your handout
Something
you think is
4.7
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Make your spice solution:
1) Write a good quantitative statement of how you are going to prepare your spice solutions. Numbers, amounts, brand names, how long to
stir, temperature water, type of water, amount of water.
2) When okay by teacher: prepare your spice solutions and soak one little disk in each Carefully use the big pin to get the little disk
out of the cup and into the solution3) Sit back down for the next bunch of instructions
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Review for 10/5 quiz How do images appear under the microscope? Inverted (upside down) Larger
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If you move a slide towards you, which way does it appear to move while looking through the microscope? Away from you
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If you move a slide to the right, which way does it appear to move while you look through the microscope? To the left – opposite the way you move it
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Know the parts and functions of a microscope. Ocular – look through and magnifies
images Objectives – magnifies images Stage – holds slide Diaphram – round spinner under stage –
controls the amount of light Course adjustment knob – focus only for
low power Fine adjustment knob – focuses on
images for all powers
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What happened to the image of the e when you went from medium to high power? It gets larger It stays inverted – doesn’t flip in
between powers.
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What is the total magnification if the ocular is 10x and the objective is 25x?
250x
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What is a bacterial lawn?
Remember?
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Do you know how to label a graphs axis?