Study Hall (8:45 – 9:15) Sharpen all pencils, grab your notebook, ready to begin

Welcome to Science Class September 15 th ( A), 2014 September 16 th (B), 2014

Warm up

The Sandwich – Cookie Challenge  A cookie company has asked us to figure out how much filling will go on a cookie.  Three different labs are conducting the tests, however the lab with the most reliable results, will be awarded the contract  Lab = classroom  Contract = money given to you  Classroom with the most reliable results = eat the cookies at the end of the challenge!

The Sandwich – Cookie Challenge  In this challenge, you must find out how much filling can be placed on the bottom cookie so it is completely covered and it does not leak over the sides

The Sandwich – Cookie Challenge  To complete the challenge, you will be using a penny, a dropping pipette, and a cup of water  Penny will represent the cookie  Water will represent the filling

The Sandwich – Cookie Challenge  Do we all agree….  that the best cookies have the most filling possible with no overflowing filling  That the penny is going to represent our cookie  That the water is going to represent our filling

The Sandwich – Cookie Challenge  We will work in pairs for this challenge  Each pair will receive a set of materials to complete the challenge  First we must identify the criteria and constraints for the challenge

2.0 The Sandwich Cookie Challenge  On the next blank page, write this title: 2.0 The Sandwich Cookie Challenge  add entry to table of contents

Criteria (goals that must be met) Constraints (limiting factors) Determine maximum number of drops of water that will fit on a penny without overflowing 1 pipette 1 cup of water 6 pennies Draw this table on the page you just labelled List criteria and constraints for this challenge (4 minutes)

2.0 The Sandwich – Cookie Challenge  For today’s challenge, you will work in pairs  I will put you in pairs now and give you your materials in a moment

2.0 The Sandwich – Cookie Challenge  I am now going to model how to use a pipette  Questions?

2.0 The Sandwich – Cookie Challenge  Before we start the challenge, you and your partner must determine the procedure you two are following  Procedure = series of steps that you will follow  Think about our procedure for taking tests / quizzes  I pass out folders  You sit up your folders to make your office / business space  You take the test / quiz  You place everything inside the folders and lay it down on the desk when you finish Any questions about a procedure?

2.0 The Sandwich – Cookie Challenge  Remember the criteria (goal) and the constraints (limiting factors) when you develop your procedure  Both you and your partner will write down the procedure you are going to follow today  7 minutes to develop and record your procedure

2.0 The Sandwich – Cookie Challenge  Soon the fun will begin!  You will be trying out your procedure and recording your data  How do we record data in science class?  In a TABLE!

2.0 The Sandwich – Cookie Challenge  Draw this table in your notebook Trial ## drops of water

2.0 The Sandwich – Cookie Challenge  I will now pass out materials….  1 pipette  1 cup of water  6 pennies

2.0 The Sandwich – Cookie Challenge  You will repeat your procedure 6 times (6 trials)  This means you will repeat this challenge 6 times  Both you and your partner must draw the table and record the # of drops of water for each trial  My advice, 1 person drop the water, the other person record the data  After all 6 trials, you both will fill in your table  Questions?  You have 15 minutes – GO!

2.0 The Sandwich – Cookie Challenge  How do we share results in our science class?  SOLUTION BRIEFING!  You will receive 1 sticky note = write the # of drops your recorded for each trial  This means you should have 6 numbers recorded  When I call you up, bring your sticky and I will record your data on a sheet of graph paper that everyone can see  Questions?

2.0 The Sandwich – Cookie Challenge  Project the graph and record each pairs’ data

2.0 The Sandwich – Cookie Challenge  The data I just recorded is known as a Line Plot  You will now get your own sheet with 2 graphs on it  copy what you see in my graph onto your own graph paper (the graph on the left side of your paper)

2.0 The Sandwich – Cookie Challenge  Find the page in your notebook with your data table and write this word: Line Plot  copy the definition (page DIV 27)

The Sandwich – Cookie Challenge  Does everyone understand how we recorded our data on the line plot?  Example: 8 X’s above 24 = 8 students recorded 24 drops of water on their penny (8 trials resulted in that measurement)  Questions?

The Sandwich – Cookie Challenge  Why do you think each pair got different results?  Why do you think our class data was spread out over a large range?  It’s because we all used different procedures!

The Sandwich – Cookie Challenge  Our class data was spread out or distributed over a large number of water drops  This spread of data is referred to as distribution  Copy this down in your notebook:  Distribution = spread

The Sandwich – Cookie Challenge  Every group used a different procedure  Copy this down in your notebook:  Variation = wide spread of data

The Sandwich – Cookie Challenge  Do you think scientists have data that is spread out or distributed over a wide range  NO!  Their data would not be reliable or trustworthy and people would not believe their research

The Sandwich – Cookie Challenge  Let’s think about….  How did you squeeze your pipette?  How high was your pipette from the penny?  Was the penny on heads or tails?

The Sandwich – Cookie Challenge  What can we do to make our data more reliable or consistent?

The Sandwich – Cookie Challenge  We can create a classroom procedure  With 1 procedure, we can all follow the same steps  Do you think this will make our data more trustworthy?

The Sandwich – Cookie Challenge  On the next blank page, record these 2 vocabulary words  Repeatable:  Replicate:  Use the textbook to write the definition for each word (DIV 29)

The Sandwich – Cookie Challenge  On this same page, record these 3 vocabulary words  Trial:  Precision:  Range:  Use the textbook to write the definition for each word (DIV 30)

Our Classroom Procedure…  1. Determine who will be recording data and who will be dropping water droplets  2. Place the penny heads side up  3. Fill the pipette up with water by squeezing the bulb, placing it in the cup of water and releasing the bulb slowly (this will allow water to fill inside the pipette)  4. Hold the full pipette 1 paper clip length above the penny  5. Squeeze the pipette gently so only 1 drop of water falls at a time  6. Count and record each water drop until the entire surface of the penny is full (this means water is near the edge of the penny but not over flowing)  7. Repeat these steps 6 times and record the data

Run the procedure again  You will now repeat the procedure however you must follow the classroom procedure  You will have 10 minutes  You will record your data on a sticky again and we will graph our results  GO!

Follow this Procedure…  1. Determine who will be recording data and who will be dropping water droplets  2. Place the penny heads side up  3. Fill the pipette up with water by squeezing the bulb, placing it in the cup of water and releasing the bulb slowly (this will allow water to fill inside the pipette)  4. Hold the full pipette 1 paper clip length above the penny  5. Squeeze the pipette gently so only 1 drop of water falls at a time  6. Count and record each water drop until the entire surface of the penny is full (this means water is near the edge of the penny but not over flowing)  7. Repeat these steps 6 times and record the data

2.0 The Sandwich – Cookie Challenge  Project the graph and record each pairs’ data

What’s the point!  Was the data closer together after the 2 nd trial?  Why is this?  We used the same procedure!  Scientists must follow the exact steps or the same procedure so their results can be repeated by other scientists. This is the only way scientists can produce reliable, trustworthy data!

Did anyone notice….  During our first trial, half of you received a pipette that had been cut  By cutting some of the pipettes, the water drops were different sizes!  So again, scientists have to make sure they are all using the same materials and the same procedures to produce repeatable and reliable results.