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Creating Experiments

Creating Experiments. What is a good lab report: . C ontains all key elements H as an excellent hypothesis C ollects data accurately H as thoughtful answers to analysis questions. Bond with a Classmate Purpose: •To understand how two elements bond to become an ionic compound

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Creating Experiments

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  1. Creating Experiments

  2. What is a good lab report: • Contains all key elements • Has an excellent hypothesis • Collects data accurately • Has thoughtful answers to analysis questions

  3. Bond with a Classmate Purpose: •To understand how two elements bond to become an ionic compound Problem:How do ions form bonds with other ions? Hypothesis:(complete before you begin): Procedure: 1. Obtain one tag from the teacher. Are you a positive (+) or negative (-) ion? 2. Find an ion with the opposite charge. 3. In the data table, write your element symbol and charge, along with your partner’s element and charge. 4. Write the compound into the data table. Remember, the positive ion is written first. 6. Find a new partner. 7. After your 5th bond, get a new tag and repeat steps 1 – 7. Do this 2 times (total of 10) Data Chart Analysis Questions: 1. What is a compound? 2. What is an ionic compound? 3. Why can’t two negative ions or two positive ions bond together? Explain. 4. How are ionic compounds named? Conclusion Statement: Write a conclusion that identifies why/why not your hypothesis was correct

  4. Scientific Method Reminder • Remember, the scientific method has 6 steps, these are in your lab report • 1. Ask A Question (Problem) • 2. Make a Hypothesis (Hypothesis) • 3. Conduct an experiment (Procedure) • 4. Analyze Data (Data Tables & Analysis Questions) • 5. Draw a conclusion (Conclusion Statement) • 6. Report Results (Turn in your Report!!)

  5. Practice writing procedures: Procedures are: -Step by step instructions for the experiment being conducted -Detail a plan for testing your hypothesis -Identify the independent and dependent variables -Include all necessary materials

  6. Examine some procedures: • EASY • Procedure: • Step 1: Divide your candy into three pieces that are the same size. • Step 2: Place one piece of candy in your mouth and allow it to dissolve without using your tongue or teeth to help! Record the time it takes for the candy to dissolve in the chart. • Step 3: Place another piece of candy in your mouth and allow it to dissolve using only your tongue to move it around. Record the time it takes for the candy to dissolve in the chart. • Step 4: Place another piece of candy in your mouth and allow it to dissolve using your tongue and teeth. Record the time it takes for the candy to dissolve in the chart. • DIFFICULT • Place a dishtowel over your work area. Keep your work on the towel. • Pour 250 mL milk, 45 mL sugar, into the small zipper bag. CAREFULLY seal the bag and shake up the mixture thoroughly. • Put this small zipper bag inside the much larger 3.8 L zipper bag. • In the 3.8 L bag add enough ice to cover the small bag and add 80 mL of ice cream salt. Take the temperature of the ice:______ C • CAREFULLY SEAL THE BAG! • Take turns flipping the bag. Hold the bag by its corners. Keep the bag flipping over and over. Remember to keep the bag over the towel at all times. It should take 20 minutes to freeze. Take the temperature of the ice/water mixture again: ________ C • While one person is flipping the bag, have the other group members take turns reading the two articles and answering the questions. You will turn in the question sheet with your lab report.

  7. Steps to make a procedure: • Look at the problem question • Write a hypothesis • Identify the independent and dependent variables • Design an experiment that will test the independent variable • Identify all materials • Make a step-by-step plan for your experiment

  8. Practice • Why are students getting sick on pizza day? Hypothesis: IF Students are getting sick THEN the pizza isn’t being cooked at the right temperature • Independent variable: Cooking temperature • Dependent variable: sick students • Experiment: Change the cooking temperature and record how many students get sick each time • Materials: Students, pizza, ovens

  9. Procedure: • Create a data table with temperature of oven on left and sick students on right • Cook pizza at 200 degrees and feed to 10 students • Record all illnesses • Repeat steps 2-3, increasing temperature to 300, 400 and 500 degrees • Record all observations, graph data and write a conclusion.

  10. 2.Why are most students late on Thursdays? Hypothesis: Independent Variable: Dependent Variable: Experiment: Materials: Procedure:

  11. 3. Why is the temperature in Ms. Gorence’s classroom colder than all other classes? Hypothesis: Independent Variable: Dependent Variable: Experiment: Materials: Procedure:

  12. 4. Does arm length affect throwing speed? Hypothesis: Independent Variable: Dependent Variable: Experiment: Materials: Procedure:

  13. Review • What is the independent variable? • What is the dependent variable? • What is the problem? • What is a hypothesis? • How do you write a procedure? • On which side of the data table is the independent variable?

  14. 7. On which side of the data table is the dependent variable? 8. On which axis is the independent variable on a graph? 9. On which axis is the dependent variable on a graph? 10. Why is it important to test your experiment more than once?

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