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

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

Welcome to Science Class

September 15th ( A) , 2014

September 16th (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!


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


To complete the challenge, you will be using a penny, a dropping pipette, and a cup of water

Penny will represent the cookieWater will represent the filling


Do we all agree….that the best cookies have the most filling

possible with no overflowing fillingThat the penny is going to represent our

cookieThat the water is going to represent our

filling


We will work in pairs for this challengeEach pair will receive a set of materials to

complete the challengeFirst 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


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?


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


Soon the fun will begin!You will be trying out your procedure

and recording your dataHow do we record data in science

class?In a TABLE!


Draw this table in your notebook

Trial # # drops of water123456


I will now pass out materials….1 pipette1 cup of water6 pennies


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!


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?


Project the graph and record each pairs’ data


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)


Find the page in your notebook with your data table and write this word: Line Plot

copy the definition (page DIV 27)


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?


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!


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


Every group used a different procedure

Copy this down in your notebook:Variation = wide spread of data


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


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?


What can we do to make our data more reliable or consistent?


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?


On the next blank page, record these 2 vocabulary words

Repeatable: Replicate:Use the textbook to write the

definition for each word (DIV 29)


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 minutesYou 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


Project the graph and record each pairs’ data

What’s the point!

Was the data closer together after the 2nd 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.

Documents

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