Friday 2/7/14

1. Friday 2/7/14 Objectives: IWBA to show mastery on gas law unit Catalyst True of False Pressure and temperature have inverse relationship. Volume and temperature have direct relationship. Pressure and volume have inverse relation ship. Homework: Book log for science fair Agenda: Catalyst -----5 min Submit homework Review gas laws----- 10 min Test on Gas Laws Science Fair Conclusion Acids and base Video clips

2. Identifying Variables&Designing Investigations

3. 3 Kinds of Variables • Independent Variable – something that is changed by the scientist • What is tested • What is manipulated

4. 3 Kinds of Variables • Dependent Variable – something that might be affected by the change in the independent variable • What is observed • What is measured • The data collected during the investigation

5. 3 Kinds of Variables • Controlled Variable – a variable that is not changed • Also called constants • Allow for a “fair test”

6. For Example:

7. Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle.

8. Let’s Practice! • A student’s grade depends on how much she studies. Independent variable:__________ Dependent variable:___________ 2. The height of a plant and the amount you water it. Independent variable: ___________ Dependent variable: _____________ Time studying grade Amount watered height

9. 3. The amount of money you make and the number of hours you work. Independent variable: _____________ Dependent variable:_____________ 4. The number of sodas you buy and the total money spent. Independent variable:______________ Dependent variable:_______________ 5. The number of houses you can paint depends on how much time you have. Independent variable:______________ Dependent variable:_______________ Hours worked Amount of money Number of sodas Total money Amount of time Number of houses

10. Identify the variables in this investigation.

11. What was the independent variable? • Ages of the students • Different ages were tested by the scientist

12. What was the dependent variable? • The time it to put the puzzle together • The time was observed and measured by the scientist

13. What was a controlled variable? • Same puzzle • All of the participants were tested with the same puzzle. • It would not have been a fair test if some had an easy 30 piece puzzle and some had a harder 500 piece puzzle.

14. Another example:

15. An investigation was done with an electromagnetic system made from a battery and wire wrapped around a nail. Different sizes of nails were used. The number of paper clips the electromagnet could pick up was measured.

16. What are the variables in this investigation?

17. Independent variable: • Sizes of nails • These were changed by the scientist

18. Dependent variable: • Number of paper clips picked up • The number of paper clips observed and counted (measured)

19. Controlled variables: • Battery, wire, type of nail • None of these items were changed

20. One more:

21. The higher the temperature of water, the faster an egg will boil.

22. Independent variable – temperature of water • Dependent variable – time to cook an egg • Controlled variable – type of egg

23. Last one:

24. The temperature of water was measured at different depths of a pond.

25. Independent variable – depth of the water • Dependent variable – temperature • Controlled variable – thermometer

26. Designing Investigations

27. The greater the amount of soap in a soap and water mixture, the bigger a soap bubble can be blown. • Design an investigation to test this hypothesis. • Identify the variables • What exactly will be changed? How will it be changed? • What exactly will be measured? How will it be measured?

28. The farther a ball drops, the higher it will bounce. • Design an investigation to test this hypothesis. • Identify the variables • What exactly will be changed? How will it be changed? • What exactly will be measured? How will it be measured?

29. Our conclusion outline T= Restate Problem Restate your hypothesis (It was predicted that…) • Accept or reject your hypothesis • Provide evidence • Actual data from the experiment What did the data say? • Relationships or trends in the data • Provide evidence Issues or problems with the investigation –Provide evidence W=Wrap it up! Concluding sentence with transition word, rephrased problem, and explain why the experiment was important.

30. Future Considerations • Tell what variable you would change if you could do the experiment again. • Tell how you might take your experiment to the next step.

31. Future Considerations • Example • If I could do this experiment again , the variable I would change would be the amount of caffeine I would place in each plant group. I would use 50ml for plant group #1, 100ml for plant group #2, and 150ml for plant group #3. I would also have three “control groups” of plants. One would get 50ml of water. One would get 100ml of water. And one would get 150ml of water. I want to see which amount of caffeine helps plants grow the tallest.

32. Make Your Board • Start your information on the top left panel of the board, move down the left panel, across the middle panel, and from the top down on the right panel. • Place pictures of your experiment on your board.

33. Make your Board

34. Make your Board

35. Bringing It Together • Keys for success: • Make a time-line and stick to it. • Parental support • Organization