1. TPS: What kinds of things do we need to think about to keep a science lab safe?

3. Read all directions before beginning a lab Including: – pre lab or background – materials needed – understanding the set up – how you will collect data

4. Wear proper safety equipment. Any ideas?

5. Wear Proper Safety Equipment Safety Goggles (Sometimes) Long Hair Up Tennis Shoes Gloves (Sometimes) Apron (Sometimes)

7. No food or drink in the lab.

8. Label chemicals and read the labels.

9. No horseplay in the lab.

10. Lab Safety Expectations Read all directions before beginning a lab. Wear proper safety equipment. Report all accidents and spills to Miss Schlarman immediately (even if no one is hurt) No food or drink in the lab. Label chemicals and read the labels. No horseplay in the lab.

11. Next up… Lab Safety posters Individual work (on 1 sheet of paper) (on one sheet of newsprint) Each poster is about 1 of the lab safety expectations. Needs: 1 lab safety expectation, 1 or more drawings about the expectation, students name, at least 3 colors, can be read from 3 feet away Worth 20 points DUE THURSDAY- same day as safety quiz

12. Do Now Think Pair Share (TPS) on your white board Have you ever learned something by observing?

13. Science is… Observable – You can see what happens OR – You can see a change in the data

14. Science is… Testable – You can make an experiment to show that a theory or hypothesis is right or wrong

15. Science is… Measurable – When you do science, you must measure your results Can be with numbers- quantitative – Like 5 grams, 10 liters, 2 tons OR Can be on a written scale –qualitative – Like small, medium, large

16. Science is… Repeatable – Science experiments can be done over and over again and produce the same results

17. Science is… Observable Testable Measurable Repeatable

18. Science is… Lets do science! Need- – Timer – Marsh mellow (1 each) Don’t eat yet! – toothpick

19. Exit Ticket Date: 8-12 Name the 4 characteristics of science & scientific invesitgations.

20. After the safety quiz YOU NEED: Lab notebook, notes Answer this questions in your notes: – Do you have one dance move or various dance moves?

21. Scientific Variables Objective- to define a variable and tell the difference between independent and dependent variables TPS- What do you think a variable is? If you guessed something that can change, you are right!

22. Scientific Variables A variable is any factor that can be controlled or changed in an experiment Changing a variable can change results Examples of variables: temperature, size, height, volume, mass, speed…

23. Let’s do an experiment YOUR MISSION Try to get the highest number of drops of water on your coin as possible! Work with your shoulder partner. One person per pair comes up to get supplies. Be sure to keep track of your number of drops!

24. What variables affected your experiment?

25. Scientific Variables Was this experiment fair? – No. Why not? – There were too many variables for the experiment to be the same. How could we make it fair? – Make the experiments more similar by using fewer variables.

26. Do Now- in your science notebooks, titled “independent vs. dependent variables” What types of things influence scoring in the olympics? https://www.youtube.com/watch?v=Mqj4kGX TQW8 https://www.youtube.com/watch?v=Mqj4kGX TQW8

27. Independent vs. Dependent Variables What was the variable that was changing as a result of these factors? – Gabby’s score This variable is called the dependent variable because it depends on other factors What is one variable that affected Gabby’s score? – Mistakes – Riskiness of move – Smoothness of routine These are independent variables

28. Discuss with your group You need: your notes What is a variable? What is an independent variable? What is a dependent variable? Give an example of each.

29. Independent vs. Dependent Variables An independent variable is a variable that stands alone and isn't changed by the other variables you are trying to measure. (This is the variable we change to see what happens.) A dependent variable is something that depends on other factors. (This variable shows what happens.)

30. An example Let’s say I do a study. I think that people with long legs run faster than people with short legs. The two variables are: leg length and speed. The independent variable is leg length, because if a person speeds up, their legs don’t change size. The dependent variable is speed, because a person might run faster if they had longer legs.

31. Another example Does fertilizer make a plant grow bigger? What are the two variables? Which is the independent variable? Why? Which is the dependent variable? Why?

32. Exit Ticket 1. What is a scientific variable? 2. What is the difference between an independent variable and a dependent variable?

33. Do Now in your science notebook Title it “Hypothesis and Procedure” Complete the following sentences: – If I get 5 hours of sleep tonight, then… – If I study more often, then… – If I ate only gummi bears, then…

34. Hypothesis What you just made is Hypothesis! A hypothesis is possible explanation about an observation that can be tested by scientific explanations. – An educated (or smart) guess – A prediction Why is this not a hypothesis? – If pigs could fly, then surly so could I.

35. Hypothesis We will use If… then statements when forming a hypothesis. If… then statements tell you which variable is independent and which variable is dependent. – Example: If I sleep for 4 hours tonight, then I will be tired tomorrow. Independent variable- hours of sleep Dependent variable- tiredness the next day How tired you are depends on how much sleep you get

36. Procedure A procedure tells you the steps to take to do your experiment It is how you test your hypothesis A procedure should be written so that anyone who does the experiment will do it in the exact same way

37. Let’s do science! Once your table has made a hypothesis (show to Miss Schlarman), then you may have your supplies. Procedure for today’s experiment: – Blow up 2 balloons. – Rub them on your hair. – Hold the balloons next to each other, but not touching each other. – Observe and write down what happens.

38. Let’s do science! Procedure for today’s experiment: – Blow up 2 balloons. – Rub them on your hair. – Hold the balloons next to each other, but not touching each other. – Observe and write down what happens. When done: – Try touching the balloons together, then holding them next to each other. What happens? – Ask Miss Schlarman first: Try holding one balloon near running water. What happens?

39. Exit Ticket 1.What is a hypothesis? 2.What is a procedure? 3.What would happen if Miss Schlarman ate a caterpillar? Write a hypothesis.

40. Data Tables Do Now: Where can you find data? How can you make your own data? What is it used for?

41. Data Tables A data table is how we organize the measurements we collect in a scientific experiment The independent variable is in the 1 st column and the dependent variable is shown in the 2 nd column.

42. Let’s try it Procedure Make a prediction about who in your group can whistle for the longest amount of time. Pick a person who has a stop watch on their cell phone to time. Collect data for each person in your group in a chart like this: WhistlerTime Miss Schlarman1 minute, 3 seconds Santa Claus3 minutes, 50 seconds Justin Beiber2 minutes, 30 seconds

43. Let’s graph our results When graphing data, the independent variable goes on the x-axis and the dependent variable goes on the y-axis

44. Exit Ticket 1.Set up a data table: I want to see how fast Jill, Bob, and Louis are so I record how long it takes them to run 100 feet. 2. Which variable goes on the y-axis? (independent or dependent)

45. https://www.youtube.com/watch?v=9kf51FpB uXQ

46. Do now in your notebooks Describe 3 times when you need use a certain amount of something. How do you measure it? I’m trusting you- no sword fights and leave the scales alone please. Title it “Measurement”

47. Measurement 3 different measurements: Length, mass, and volume

48. Measurement Length How long something is Units in everyday life- inches, feet, hands, etc. Units in science- meters and centimeters

49. Measurement Mass Measures the amount of matter in something Usually used to describe how heavy something is Units in everyday life- tons, lbs, etc. Units in science- grams

50. Measurement Volume How much space is in something Units in everyday life- cups, quarts, gallons Units in science- milliliters and liters Measure from the meniscus

51. Measurement Stations today http://timer.onlineclock.net/ Measure to the best of your ability Always measure using centimeters, grams, or milliliters

52. Measurement Exit Ticket 1.What are the units for mass? 2.Measure the length of your thumb nail in centimeters.

53. Measurement Matter is anything that has mass and volume. Is it matter? – Air – Water – Ideas – A Dog – You – Love – Perfume – Freedom

54. Measurement Always measure to one digit past what you can with your instrument. If you know that your measurement is a little more than 2.5, then estimate. – Is it more like 2.51 or 2.54?

55. Measurement I’m going to come around and see how you measure You should read p NOS 14-20 and complete Questions 1-7 on page NOS 20

56. Do Now In your notebook, title it “Accuracy vs Precision” How accurate are you when you shoot pool? Do you sink balls often or every once in a while? How precise are you when you make cookies? Do you always make them the same, or do you mix it up?

57. Accuracy vs. Precision Precision is how close measured values are to each other

58. Accuracy vs. Precision Accuracy is how close measured values are to the real value

59. Accuracy vs. Precision A really well done experiment will have measurements that are both precise and accurate.

60. Accuracy vs. Precision Precision is how closely measured values are to each other Accuracy is how close measured values are to the real value

61. Accuracy vs. Precision Lets try it out! Who is the most precise? Who is the most accurate? Take a few practice shots. Draw the results of each person in your group, then label those results precise, accurate, both, or neither.

62. Accuracy vs. Precision Exit Ticket What is the difference between precision and accuracy? (Write or Draw and Label.)