catalyst – august 2+21, 2010 1. what question is this data table answering? 2. what is one...
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Catalyst – August 2+21, 2010Monday Mystery Element!
1. Isolated first by British scientist Henry Cavendish
2. Element name means “water” “creator”
3. Predominant element in stars
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Catalyst – August 2+21, 2010Monday Mystery
Element!
1. Isolated first by British scientist Henry Cavendish
2. Element name means “water” “creator”
3. Predominant element in stars HYDROGE
N!!
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HydrogenHydrogen
• Light weight, very flammable (good/bad combo for blimps; 1937)
•Basis of the atomic bomb
•Potential energy source
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Today’s Agenda
Catalyst Variables Notes and Practice Time
I-N-D-E-P-E-N-D-E-N-T! DEPENDENT CONSTANTS
Exit QuestionHOMEWORK TONIGHT!QUIZ ON THURSDAY!
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Today’s Objectives
SWBAT identify independent, dependent, and constant variables in a scientific experiment.
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White Board Door into classL R
3rd Period
Group 4
Melvin, Kendell,
Marissa, Shawn
Group 3
Chicobi, Kara, Bao
Group 1
Corey, Amber, Jasmine, Quanetta
Group 2
Sara, Brandon, Ebony,
Alessandro
Group 5
Ronald, Paula, Jamie, Warren
Group 6
Ariel, Waynell, Tashelle, David
Group 8 Group 7Group 9
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White Board Door into classL R
4th Period
Group 4
Lyndon, Rodrea,
Shannon, Chelsie
Group 3
Kentrell, Brittany,
Roniece, Daniel
Group 1
Jon, Jytte’, Jaron,
Stephanie
Group 2
Josh’shawn, Sam, Artrel, Kourtney
Group 5
Ronald, Paula, Jamie, Warren
Group 6
Caleb, Aaron, Kim, Lizzeh
Group 8
Group 7
Khallid, Eddie, Infinity
Group 9
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This Week’s Agenda
Monday: Variables Tuesday: Procedures Wednesday: Lab Safety, Mystery
Goo Lab! Thursday: Quiz 1.1 Friday: How to Be a Real Life
Scientist
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Experimentation
Key Point #1: A proper experiment always has an independent variable and dependent variable. The purpose of an experiment is to test how changing ONE THING affects something else.
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Variables
Independent Variable: what causes the change we are measuring (acts independently)
Dependent variable: what gets changed (depends on other things)
Remember!!!! Variables are always CATEGORIES of
things: time, amount, frequency, size, type Variables are NEVER specific things!!!
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Demo
http://www.unitedstreaming.com/videos/dsc/externalApplications/virtual_labs-es/Plants/index.html
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Teacher Models
Scientists have discovered something shocking: if you eat a lot of hanburgers, then you will gain fat. What is the independent variable?A. Eat a lot of hamburgersB. Type of hamburger you eat (McDonald’s,
Wendy’s, Burger King, etc.)C. Amount of hamburgers you eatD. How much weight you gain
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Teacher Models
Well-rested students learn more in school. So, Ms. Stroh believes that starting school later would increase test scores. What is the dependent variable?A. Starting school laterB. Well-rested studentsC. Time that school startsD. Test scores
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NEW PROCEDURE!
WHITEBOARDS!
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Whiteboard Practice
When Ms. Stroh says “GO!” Send one member of your group
to get whiteboards, erasers, and markers for everyone (back lab bench)
Hurry! Remember, we want to stay under 3 minutes of transition time!
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Whiteboards 1
Ms. Stroh believes that the more you study, the better grades you’ll earn. What is the independent variable?A. Studying moreB. Amount of time you studyC. Grade earnedD. Type of test
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Whiteboards 2
Shanel is always cold in class. She hypothesizes that if she wears many layers of clothing to school, then she will be warmer. What is the dependent variable?A. Number of layers Shanel wearsB. How warm Shanel isC. Temperature of the roomD. Shanel will be warmer
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Whiteboards 3
Ms. Stroh’s students want to test how easily bought off she is. Students who give her an apple get a “C.” Students who give her candy get an “A.” What is the independent variable?A. Type of food given to Ms. StrohB. Apples and candyC. “A” on the report cardD. Report card
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Whiteboards 4
Tashica hates cooking, but loves listening to music. She believes that if she listens to music while cooking, then she will cook more often. What is the dependent variable?A. She will cook more oftenB. Listens to music while cookingC. Frequency that Tashica cooksD. What Tashica listens to
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If you’re having trouble…
4 minutes 26 mg of baking
soda Lifting weights
every day Medium t-shirts Bullfrog 16 candles Never gets sick
Time to get dressed Amount of baking
soda Frequency of lifting
weights Size of t-shirts Type of frog Number of candles Degree of health
WRONG RIGHT
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Review
Ms. Stroh believes that the more you study, the better grades you’ll earn. What is the independent variable?A. Studying moreB. Amount of time you studyC. Grade earnedD. Type of test
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Review
Shanel is always cold in class. She hypothesizes that if she wears many layers of clothing to school, then she will be warmer. What is the dependent variable?A. Number of layers Shanel wearsB. How warm Shanel isC. Temperature of the roomD. Shanel will be warmer
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Review
Ms. Stroh’s students want to test how easily bought off she is. Students who give her an apple get a “C.” Students who give her candy get an “A.” What is the independent variable?A. Type of food given to Ms. StrohB. Apples and candyC. “A” on the report cardD. Report card
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Review
Tashica hates cooking, but loves listening to music. She believes that if she listens to music while cooking, then she will cook more often. What is the dependent variable?A. She will cook more oftenB. Listens to music while cookingC. Frequency that Tashica cooksD. What Tashica listens to
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Guided Practice Worksheet
10 minutes to complete3 minutes to compare answers
KEEP THIS to help you with homework tonight
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Constants
Key Point #2: Everything but the independent and dependent variable must be kept constant. Constant: variable we keep the same
If many different things change at once, we don’t know what causes the change!
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Example
Let’s say we want to design an experiment to determine what causes the Hornets to win games.
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Number of games that
Hornets win
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Try this one! Answer in notes… Travie McCoy hypothesizes that if he
write more songs about being rich, then he will sell more CDs because his listeners also want to be rich. What is the IV? What is the DV? What are the constants?
Remember, variables are CATEGORIES.
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If Travie write more songs about being rich, then he will sell more CDs because his listeners also want to be rich.
IV Number of songs about being rich How often Travie sings about being rich Amount of times Travie sings about money
DV Number of CDs Travie sells How many CDs Travie sells
Constant Amount of money CDs cost Number of tracks on each CD How good each CD is
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Practice
You want to know when in the year there are the most love bugs. Every night, you record how many love bugs you find outside.
IV =
DV =
Constant =
Time of year (season/month)
Amount of fireflies
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Practice
Maria needs to run a 6 minute mile to pass PE. She believes that if she runs every day, then she will be able to run faster.
IV =
DV =
Constant =
Frequency that Maria runs
Mile time
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Practice
Students of different genders were given the same puzzle to assemble. The puzzle assembly time was measured.
IV =
DV =
Constant =
Type of gender
Time to assemble puzzle
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If there are more students, then there
will be more school bus drivers.
IV =
DV =
Constant =
Amount of students
Number of school bus drivers
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If the amount of sugar used on beignets decreases, then less beignets will be sold.
What depends on what?
IV =
DV =
Constant =
Amount of sugar usedNumber of beignets sold
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IV = Number of games won
DV = Number of players attracted
Constant =
If the Saints win more games, then they will attract more big name players.
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Conclusion
A proper experiment always has an independent variable and dependent variable. Everything but the independent and dependent variable must be kept constant. Independent Variable: what causes the
change we are measuring Dependent variable: what gets changed Constant: variable we keep the same
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Exit Question
Let’s say you want to figure out if drinking milk actually makes you taller. So you drink a glass of milk every day, and record your height every day.
1. What is the independent variable?2. What is the dependent variable?3. What are at least two constants?
Write in complete sentences!
Don’t talk during the Exit Question!