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Understanding Variables in Science Experiments

This page explores the concepts of independent and dependent variables in science experiments, using the example of improving the taste of donuts. Students are asked to identify possible independent and dependent variables and create their own experiments. The page also covers the distinction between control and experimental groups.

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Understanding Variables in Science Experiments

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  1. Agenda 9/2: Page 20 for homework. Robotics Club starts on 9/10Warm-up : What does independent and dependent variable mean? You want to make a better tasting donut. Write two possible independent variables and two dependent variables on page 20?Table of Contents for Interactive NotebookUnit: 1 ( Chapter 1,2 &3)

  2. Warm-up: What does independent and dependent variable mean? You want to make a better tasting donut. Write two possible independent variables and two dependent variables on page 20? 20

  3. Standard 9c: Variables CONSTANTS-What you keep the same between the groups DESIGN YOUR OWN EXPERIMENT Create an experiment on making better tasting cookies. 1. Independent variable is NOT present Independent variable is present Constants 2. Identify the independent and dependent variables. 20

  4. ScienceStandard 9c. Distinguish between variable and controlled parameters (constants) • Objective: • How would you identify examples of independent and dependent variables? • What is the difference between a control group and experimental group?

  5. 21 Controls and variables Part 2 Make four boxes on page 21. Tape the hand-out to page 21. Answer below the hand-out. Draw a Venn Diagram for each experiment. There are four experiments. Answer the following questions only in your notebook also. 2.A 1. A B. C. D. B. C. D. Constants 3.A 4.A B. C. D. B. C. D.

  6. 21 Controls and variables Make four boxes on page 21. Tape the hand-out to page 21. Answer below the hand-out. Draw a Venn Diagram for each experiment. There are three experiments. Answer the following questions only in your notebook also. 1. Breath Mints 1.a Constants

  7. 21 Controls and variables Secret ingredient mint Just breath mint 1. Breath Mints 1.a Constants

  8. 21 Controls and variables Secret ingredient mint Just breath mint 1. Breath Mints 1.a Constants Krabby patties

  9. 21 Controls and variables Secret ingredient mint Just breath mint 1. Breath Mints 1.a b. The independent variable is the new breath mint. Constants Crabby patties

  10. 21 Controls and variables Secret ingredient mint Just breath mint 1. Breath Mints 1.a b. The independent variable is the new breath mint. c. The dependent variable is the difference in fresh breath. Constants Crabby patties

  11. 21 Controls and variables Just breath mint Secret ingredient mint 1. Breath Mints 1.a b. The independent variable is the new breath mint. c. The dependent variable is the difference in fresh breath. d. The new breath mint worked since 30 people had fresh breath compared to 10 people. Constants Crabby patties

  12. Team Roles • Read Problem 2 on page 21. Communicator reads Problem 2 out loud and then each question on A-D. Everyone highlights answers by following question A-D on hand-out.Team leader- Initiate task immediately. Make sure everyone is on task at the same time. Academic Coach- Help students that may not understandAsk Communicator and Lab tech for assistance if needed before the teacher.

  13. ScienceStandard 9c. Distinguish between variable and controlled parameters (constants) Objective: • How would you identify examples of independent and dependent variables? • What is the difference between a control group and experimental group?

  14. Name Period Quiz week of 9/1 Ticket out the Door Tuesday 1. 2. 3. 4. 5. I chose __ because_____ & _______.

  15. 1. What are the three types of matter? A. solid, melting and liquid B. solid, freezing, gas C. solid, liquid, gas D. solid, liquid, freezing

  16. 2. Which of the following has energy? A. solid B. liquid C. gas D. all of them

  17. 3. A student wants to change the size of the wheels on a car. What is the variable? A. student B. wheels C. car D. speed

  18. 4. A student wanted to see what technique would melt the ice the fastest. He put an ice in a bag and smashed the ice and recorded the time it took to melt. He had another bag of ice left untouched. What is a the dependent variable in the experiment? A. Smashing the ice B. Speed of melting C. Bag and ice D. None of these

  19. 5. A student wanted to see what technique would melt the ice the fastest. He put an ice in a bag and smashed the ice and recorded the time it took to melt. He had another bag of ice left untouched. What was the independent variable? A. bag of ice that was left alone B. bag of ice that was smashed C. the time that it took to melt D. None of these I chose _______ because _______ & ______.

  20. 1. What are the three types of matter? A. solid, melting and liquid B. solid, freezing, gas C. solid, liquid, gas D. solid, liquid, freezing

  21. 2. Which of the following has energy? A. solid B. liquid C. gas D. all of them

  22. 3. A student wants to change the size of the wheels on a car. What is the variable? A. student B. wheels C. car D. speed

  23. 4. A student wanted to see what technique would melt the ice the fastest. He put an ice in a bag and smashed the ice and recorded the time it took to melt. He had another bag of ice left untouched. What is the dependent variable in the experiment? A. Smashing the ice B. Speed of melting C. Bag and ice D. None of these

  24. 5. A student wanted to see what technique would melt the ice the fastest. He put an ice in a bag and smashed the ice and recorded the time it took to melt. He had another bag of ice left untouched. What was the independent variable? A. bag of ice that was left alone B. bag of ice that was smashed C. the time that it took to melt D. None of these

  25. Name Period Quiz week of 9/3 Ticket out the Door Thursday 1. 2. 3. 4. 5. I chose__ because_____ & _____. Friday 1. 2. 3. 4. 5. I chose__ because_____ & _____.

  26. 1. A student wants to change the angle of a rocket to see how far it will fly. What is the variable? A. Student B. Speed of rocket C. Design of rocket D. Angle

  27. 2. Juan wants to see if adding sugar to the water will help plants grow faster. He sets up 10 roses and waters them with some sugar in 3 liters of water. He sets up another group of roses without sugar in 3 liters of water. What is the independent variable? • roses • growth • sugar • None of the above

  28. 3. Juan wants to see if adding sugar to the water will help plants grow faster. He sets up 10 roses and waters them with some sugar in 3 liters of water. He sets up another group of roses without sugar in 3 liters of water. What is the dependent variable? • roses • growth • sugar • None of the above

  29. 4. Juan wants to see if adding sugar to the water will help plants grow faster. He sets up 10 roses and waters them with some sugar in 3 liters of water. He sets up another group of roses without sugar in 3 liters of water. Which is a constant? • roses • growth • sugar • None of the above No sugar added Sugar added

  30. 5. Juan wants to see if adding sugar to the water will help plants grow faster. He sets up 10 roses and waters them with some sugar in 3 liters of water. He sets up another group of roses without sugar in 3 liters of water. Which is the control group? • Plants in water only • Plants in water and sugar • Plants in different amounts of water • None of the above No sugar added Sugar added

  31. 1. A student wants to change the angle of a rocket to see how far it will fly. What is the variable? A. Student B. Speed of rocket C. Design of rocket D. Angle

  32. 2. Mark wants to see if adding sugar to the water will help plants grow faster. He sets up 10 roses and waters them with some sugar in 3 liters of water. He sets up another group of roses without sugar in 3 liters of water. What is the independent variable? • roses • growth • sugar • None of the above

  33. 3. Mark wants to see if adding sugar to the water will help plants grow faster. He sets up 10 roses and waters them with some sugar in 3 liters of water. He sets up another group of roses without sugar in 3 liters of water. What is the dependent variable? • roses • growth • sugar • None of the above

  34. 4. Mark wants to see if adding sugar to the water will help plants grow faster. He sets up 10 roses and waters them with some sugar in 3 liters of water. He sets up another group of roses without sugar in 3 liters of water. Which is a constant? • roses • growth • sugar • None of the above No sugar added Sugar added

  35. 5. Mark wants to see if adding sugar to the water will help plants grow faster. He sets up 10 roses and waters them with some sugar in 3 liters of water. He sets up another group of roses without sugar in 3 liters of water. Which is the control group? • Plants in water only • Plants in water and sugar • Plants in different amounts of water • None of the above No sugar added Sugar added

  36. Standard 9c: Variables 24 121 Warm-up: A student wants to find out if taking notes makes a difference in test scores. He test another group without notes. What is the independent and dependent variable? What would be the constants? Experiment Practice A student wants to see if highlighting notes affects test scores. One group highlights and one group does not highlight. They have the same lecture. 1. Constants 2. Identify the independent and dependent variables.

  37. Agenda 9/1: Complete page 26 by Tuesday, Create an experiment on cookiesWarm-up 9/1 : Read Problem C on page 25. Communicator reads Problem C out loud and then each question on 1-5. Everyone highlights answers by following Number 1-5 on hand-out.Team leader- Initiate task immediately. Make sure everyone is on task at the same time. Academic Coach- Help students that may not understandAsk Communicator and Lab tech for assistance if needed before the teacher.Table of Contents for Interactive NotebookUnit: 1 ( Chapter 1,2 &3)

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