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  1. 8th Grade Science Chapter 1- Science in our World © Fall 2005, Pflugerville ISD, 8th Grade

  2. 8th Grade Science Chapter 1- Science in our World PISD PowerPoint Lessons Developed By Ryan Gross, Park Crest Middle School Edited By Kenn Heydrick, Coordinator of Science & Health © Fall 2005, Pflugerville ISD, 8th Grade

  3. Chapter 1- Science in our World Section 1: Science and Scientists Section 2: Scientific Methods Section 3: Scientific Models Section 4: Tools, Measurement and Safety Unit A : Chapter 1

  4. What is Science? What Do You Think? What have you done today that involved the use of science? Unit A : Chapter 1

  5. What is Science? Science Starts With a Question… Unit A : Chapter 1

  6. What is Science? Why is the Grass Green? Unit A : Chapter 1

  7. What is Science? Why is the Sky Blue? Unit A : Chapter 1

  8. What is Science? What Makes an Airplane Work? Unit A : Chapter 1

  9. What is Science? • Through careful investigation involving: • Research • Observation • Experimentation • All of these questions and more can be answered! Unit A : Chapter 1

  10. What is a Scientist? What Do You Think? What has a scientist done for you today? Unit A : Chapter 1

  11. What is a Scientist? Scientists Make Observations… Unit A : Chapter 1

  12. What is a Scientist? Scientists Form and Test Hypotheses… Unit A : Chapter 1

  13. What is a Scientist? Scientists Analyze the Results… Unit A : Chapter 1

  14. What is a Scientist? Scientists Draw Conclusions… Unit A : Chapter 1

  15. What is a Scientist? Scientists Communicate Results… Unit A : Chapter 1

  16. What is a Model? What Do You Think? What would it look like if I were holding a life-size model of the earth? Draw a picture… Unit A : Chapter 1

  17. What is a Model? Physical Models Unit A : Chapter 1

  18. What is a Model? Mathematical Models Unit A : Chapter 1

  19. What is a Model? Conceptual Models Unit A : Chapter 1

  20. What is SI? What Do You Think? The weatherman said it’s going to be 45 degrees. Is this hot or cool? Does it matter where on Earth you are? Unit A : Chapter 1

  21. What is SI? 45 Degrees Fahrenheit: Unit A : Chapter 1

  22. What is SI? 45 Degrees Celsius: Unit A : Chapter 1

  23. What is SI? In the late 1700s, The French Academy of Sciences set up a system of weights and measures based on the number ten Unit A : Chapter 1

  24. What is SI? This “metric system” was accepted by scientists and governments around the world as the International System of Units, or SI. Unit A : Chapter 1

  25. What is SI? SI Units for Length: Unit A : Chapter 1

  26. What is SI? • A meter is the SI unit of Length. Other SI units of length are larger or smaller than the meter by factors of 10 • A centimeter is 1/100th of a meter • A kilometer is 1000 meters Unit A : Chapter 1

  27. What is SI? SI Units for Volume: Unit A : Chapter 1

  28. How Can Matter Be Measured and Compared? • Volume can be measured using a graduated cylinder. It is marked in milliliters (mL). • A milliliter is equal to one cubic centimeter (1cc) Unit A : Chapter 1

  29. What is SI? SI Units for Mass: Unit A : Chapter 1

  30. What Are Three States of Matter? Mass is the amount of matter something contains. A large, heavy object has more mass than a small, light object. Which has more mass? Unit A : Chapter 1

  31. How Can Matter Be Measured and Compared? Mass is measured in units called grams and kilograms. When the pans are level, the objects on the two pans have the same mass. Unit A : Chapter 1

  32. How Can Matter Be Measured and Compared? Try This! • Select 5 objects to measure on a balance. • Measure and order the objects from the least to the greatest mass. • Share your findings with the class. • Can you find objects that have the same mass? Unit A : Chapter 1

  33. What is SI? • If you measure the mass and volume of an object, you can calculate its density • Density is the amount of matter in a given volume Unit A : Chapter 1

  34. What is SI? SI Units for Temperature: Unit A : Chapter 1

  35. What is SI? • Temperature is a measure of how hot or cold a substance is • Temperature is often measured using the Celsius scale, but the Kelvin scale is also used by scientists Unit A : Chapter 1

  36. What is SI? Three Temperature Scales: Unit A : Chapter 1

  37. Let’s Review! - 1 - What is Science? Unit A : Chapter 1

  38. Let’s Review! • 2 - • If your hypothesis is not supported by your experiment, do you give up? • Why or why not? Unit A : Chapter 1

  39. Let’s Review! • 3 - • How are models used to represent the natural world? • What are two limitations of models? Unit A : Chapter 1

  40. Let’s Review! • 4 - • What is the density of lead if a cube measuring 2 cm per side has a mass of 90.8 g? Unit A : Chapter 1

  41. Web Sites to Visit • http://lamar.colostate.edu/~hillger/everyday.htm • http://whyfiles.larc.nasa.gov/text/kids/Research_Rack/tools/scientific_method.html Unit A : Chapter 1