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8 th Science Processes. TEK 8.1. TEK 8.1 A and B. Demonstrate safe practice during lab and field investigations Practice appropriate use and conservation of resources. Important rules!. Stop to think!. Common sense will help, if exercised What will be the consequences of what I do next?
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TEK 8.1 A and B • Demonstrate safe practice during lab and field investigations • Practice appropriate use and conservation of resources.
Important rules! • Stop to think!. • Common sense will help, if exercised • What will be the consequences of what I do next? • If in doubt, ask the teacher.
1. List 3 unsafe activities shown in the illustration and explain why each is unsafe.2. List 3 correct lab procedures depicted in the illustration.3. What should Bob do after the accident?4. What should Sue have done to avoid an accident?5. What are three things shown in the lab that should not be there?6. Compare Joe and Carl's lab techniques. Who is doing it the correct way?7. What will happen to Ray and Tim when the teacher catches them?8. List three items in the illustration that are there for the safety of the students in the lab.9. What is Betty doing wrong?
Graduated Cylinder • Measures volume in mL
Triple Beam Balance • Measures mass in grams
Goggles • Eye protection
Beaker • Measures volume in mL
Magnifying glass • Enlarge an image
Test tube clamp • Holds test tube
Erlenmeyer Flask • Measures volume in mL
Test Tube rack • Holds test tubes
Bunsen Burner • Adds heat
Test Tube • Holds small amounts of liquid
Beaker Tongs • Holds Beakers
Petri dish • Holds specimens
Ruler • Measures distances
Thermometer • Measures temperature
Dropper • Places small amounts of liquid on different substances
Tweezers • Pick up small objects
Scissors • Cutting
Microscope • Magnifying small objects
Teacher • Ask for help when in doubt
Hot plate • Heats up substances
Fire extinguisher • Put out fires
Gloves • Protect hands from warm substances
Apron • Protect clothing and skin
I had just left home when I realized I had forgotten my books so I went back to pick them up. Things went fine until I had a flat tire. I started out calmly, but sped up when I realized I was going to be late. Identify the graph that matches each of the following stories:
What percent of the day is spent watching TV? How many hours are spent sleeping? What activity takes up the least amount of time? What activity takes up a quarter of the day? What two activities take up 50% of the day? What two activities take up 25% of the day? Answer these questions:
Answer the questions… • How many sets of data are represented? • On approximately what calendar date does the graph begin? • In what month does the graph reach its highest point?
How many total miles did the car travel? What was the average speed of the car from A to B? Describe the motion of the car between hours 5 and 12? How many miles were traveled in the first two hours of the trip? Which line represents the fastest speed? Answer the questions…
What is the dependent variable on this graph? Does the price per bushel always increase with demand? What is the demand when the price is 5$ per bushel? Answer the questions…
Answer the questions… • What is the independent variable on this table? • What is the dependent variable on this table? • How many elements are represented on the table? • Which element has the highest ionization energy? • Describe the shape of the line graph that this data would produce?
Answer the questions… • How much rain fell in Mar of 1989? • How much more rain fell in Feb of 1990 than in Feb of 1989? • Which year had the most rainfall? • What is the wettest month on the graph?
How many A's were earned during the fall and spring of 1990? How many more A's were earned in the fall of 1991 than in the spring of 1991? In which year were the most A's earned? In which semester were the most A's earned? In which semester and year were the fewest A's earned? Answer the questions…
What is the total freshman enrollment of the college? What percent of the students are majoring in physics? How many students are majoring in economics? How many more students major in poly sci than in psych?
Models • A model is something that can be used to enhance our understanding because it shares certain characteristics with the object of study. By definition it also differs in many ways from what it models. If it were not different, it would not be a model; it would be the “real thing.”
Why use models at all? We may decide to use a model because the real object of study is too big, too small, too complex, to hard to find, to isolate, or to manipulate, or for some other reason is difficult to study on its own
Choose models carefully. • Know why you chose a model; think about its strengths and weaknesses as a model. • Specifically discuss these points with students. • Be open to new models
Why are we using a model instead of directly studying the real thing? • What characteristics does this model share with the real object of study? • In what ways is it different? • What other models could we use? • Is this a good model for us to use? Why or why not?
What is a model? • What kinds of models are there? • What do all models have in common? • How can models be used in science and mathematics? • What should scientists and other scholars remember when using models?
