Catalyst – August 27-4, 2011 HW OUT PLEASE! Daneel is a college chemistry student. His professor...

Catalyst – January 3(6), 2012WAY BACK WEDNESDAY!!!

1. Which is more specific: a genus or a species?

2. Fill in the blanks using the following words: GENES, ENERGY, EVOLUTION, CELLS. You can just write the correct word.

A. ____________ are the basic unit of life B. New species and inherited traits are the

product of __________________C. __________________ are the basic unit of

heredity D. Living organisms consume and transform

_____________________

Catalyst – January 3(6), 2012WAY BACK WEDNESDAY!!!

1. Which is more specific: a genus or a species?

2. Fill in the blanks using the following words: GENES, ENERGY, EVOLUTION, CELLS. You can just write the correct word.

A. __________________ are the basic unit of life B. New species and inherited traits are the

product of __________________C. __________________ are the basic unit of

heredity D. Living organisms consume and transform

_____________________

CELLS

EVOLUTIONGENES

ENERGY

Today’s Agenda

Catalyst Review Scientific Method Variables Notes and Practice Time

I-N-D-E-P-E-N-D-E-N-T! DEPENDENT CONSTANTS

Exit QuestionHW: IV, DV, Constants Worksheet

Today’s AgendaMs. Stroh is leaving early!

Catalyst Review Scientific Method Variables Notes

I-N-D-E-P-E-N-D-E-N-T! DEPENDENT CONSTANTS

SUB WORK (2nd Half of Class) Complete both worksheets; leave in

folder

Front DoorProjector5th Period

Group 3

Amber, Blake, Brannesha, Myra

Group 2

Sharika, Roxy, Aerial, Angel

Group 1

Chalsey, Titus, Antoineka

Group 6

Ovile, Kevin, Molly, Champagne

Group 4

Keiara, Boris, Nasheema, Myjiel (lab table)

Group 9

Larriane, Myderika, Jerome

Group 8

Jesus, LaNell, Taylor, Erica

Group 7

Katherine, Antione, Jornell

Group 5

Alesia, Ashley, Torien, Chyna

FYI (For Your Information)

Quiz 1.1 has been pushed back to Tuesday, 1/24

Unit 1 Test has been pushed back to Tuesday, 1/31

Summary of Yesterday

An experimental question must be specific and testable

A hypothesis must be a statement that answers the question and gives a supporting reason

An experiment is the method to test the hypothesis and see if it was correct or incorrect

Yesterday’s Exit Question

You observe that students in Ms. Stroh’s class get

higher grades on their tests than the students in

Ms. Blair’s class.

1. Write a question about this situation?

2. Write a testable hypothesis to answer your question.

Piggies!

1. Specific problem?2. Info needed?3. Hypothesis?

Last Night’s Homework

1. Overall purpose of the article?2. Hypothesis to explain why

squirrels hibernate3. Hypothesis to explain why

squirrels callNew Info: check out the

handout

Today’s Objectives

SWBAT identify and distinguish between independent variables, dependent variables, and constants in a scientific experiment.

NOTES: VARIABLES

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

Variable: a quantity or condition that can have more than one value; variable means change!

Variables

Independent Variable: variable that you change during an experiment; causes the change you are measuring; aka manipulated variable (acts independently)

Dependent Variable: variable that is observed; changes in response to change in IV; aka responding variable (depends on other things)

Variables Continued

Remember!!!! Variables are always CATEGORIES of

things: time, amount, frequency, size, type

Variables are NEVER specific things

Demo

http://www.unitedstreaming.com/videos/dsc/externalApplications/virtual_labs-es/Plants/index.html

Teacher Models

Scientists have discovered something shocking: if you eat a lot of hamburgers, 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

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

NEW PROCEDURE!

WHITEBOARDS!

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!

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

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

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

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

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

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

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

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

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

Guided Practice Worksheet

10 minutes to complete3 minutes to compare answers

KEEP THIS to help you with homework tonight

Constants

Key Point #2: Everything but the independent and dependent variable must be kept constant. Constants: other experimental factors (potential variables) that stay the same throughout experiment

If many different things change at once, we don’t know what causes the change!

Example

Let’s say we want to design an experiment to determine what causes the Hornets to win games.

Number of games that

Hornets win

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.

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

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

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

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

If there are more students, then there

will be more school bus drivers.

IV =

DV =

Constant =

Amount of students

Number of school bus drivers

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

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.

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: manipulated variable Dependent variable: responding variable Constants: factors kept the same throughout

experiment

Exit Question

Let’s say you want to figure out what drink will make you taller: milk, Gatorade, or water. You drink each for a month and record your height at the end of each month.

1. What is the independent variable?2. What is the dependent variable?3. What are at least two factors that

should be held constant?HW: IV, DV, Constants Worksheet