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Safety

Safety. Wear closed shoes that cover foot. Do not prop door open, must remain closed. NO FOOD OR DRINK in the lab. No children in the lab. Lab equipment:. 2. 1. 3. 4. 5. 6. 7. Images from Jeff Beck http://iws.ccccd.edu/jbeck/Measurementweb/Page.html. Unit 1 Measurement. Pages 11-27.

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Safety

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  1. Safety • Wear closed shoes that cover foot. • Do not prop door open, must remain closed. • NO FOOD OR DRINK in the lab. • No children in the lab.

  2. Lab equipment: 2. 1.

  3. 3. 4. 5.

  4. 6. 7. Images from Jeff Beck http://iws.ccccd.edu/jbeck/Measurementweb/Page.html

  5. Unit 1 Measurement Pages 11-27

  6. Metric System • Basic units • Length-meter • Mass-gram • Volume- liter • Based on ten • Prefixes used to modify the base

  7. Metric Prefixes • Kilo (k) • 1000 X base unit (103 X base unit) • Hecto (h) • 100 X base unit (102 X base unit) • Deka (da) • 10 X base unit (101 X base unit)

  8. Metric prefixes • Deci (d) • 1/10 X base unit (10-1 X base unit) • Centi (c) • 1/100 X base unit (10-2 X base unit) • Milli (m) • 1/1000 X base unit (10-3 X base unit)

  9. Less commonly used prefixes • Tera 1012 • Giga 109 • Mega 106 • Micro 10-6 • Nano 10-9 • Pico 10-12

  10. Conversions within metric system • Because system is based on 10, conversions are made easy by using a shorthand line chart

  11. Base Unit kilo hecto deka deci centi milli

  12. Convert 54.56 cm to km. To convert, move decimal point 5 places to the left. Base Unit kilo hecto deka deci centi milli Answer: 0.0005456 km

  13. Convert 0.1 km to meters To convert, move decimal point 3 places to the __?___. Base Unit kilo hecto deka deci centi milli Answer: 100 m

  14. Convert 20 centigrams to dekagrams. To convert, move decimal point 3 places to the ____. Base Unit kilo hecto deka deci centi milli Answer: 0.02 dag

  15. Notice that there are 3 spaces on the number line between Giga and Mega. Base Unit Giga Mega hecto deka deci centi milli micro nano kilo

  16. Notice that there are 3 spaces on the number line between Giga and Mega. Convert 1,800,000 kilometers to gigameters. Move decimal ____ places to the ______. Base Unit Giga Mega hecto deka deci centi milli micro nano kilo Answer 1.8 gigameters

  17. Scientific Notation (p 23) • Uses powers of 10 so that very large or small numbers can be expressed concisely. • 100 =1 • 103= 1000 • 10-5 = 1/100000 or 0.00001 • Each time the exponent power is increased by 1, we are really multiplying by 10. • Each time the exponent power is decreased by 1, we are dividing by 10.

  18. Express 800,000 in scientific notation. • Place 1 digit in front of the decimal point and multiply by the correct exponent. • Answer • 8 X 10 5 • Express 80,055 in scientific notation. • Answer • 8.0055 X 104

  19. Scientific Notation • Express 0.000993 in scientific notation. • Place one digit in front of the decimal point and multiply by the correct exponent. • Answer • 9.93 X 10 - 4

  20. English to Metric Conversions p 18 • Convert 25 degrees Celsius to degrees Fahrenheit. • Use one of these formulas (which one?) • C= 0.55 (F - 32) • F= 1.8(C) + 32 • F = 1.8 (25) +32

  21. English to Metric Conversions • A patient in a doctor’s office weighs 200 pounds. How may kg does this patient weigh? • 1 kg = 2.21 pounds (see p 27 for conversions) • Multiply by a conversion factor which will have the same result as multiplying by one. 1 kg = 90.5 kg 200 pounds 2.21 pounds

  22. Special Instructions for Unit 1 • Homework assignment will be given at end of class. • Check-out procedure: Graphing Exercise and hypothesis for your groups’ mealworm experiment.

  23. I. Metric Units • Read • II. Metric Conversions • Read • Do Exercise 1.1 Practice Conversions (can do at home.) • III. Length Measurements • Read and do Exercise 1.2. Do some measurements but it is not necessary to do them all. • You need to do the measurement of a dime on p. 14.

  24. IV. Volume • Read and do all exercises • Everyone should practice using a pipet • V. Mass • Read and do all exercises • Note: 1 cc = 1 ml = 1 g (Must remember this!)

  25. VI. Temperature • Take readings in Celsius of temps of water at station in back. The incubator in the gray box in the back corner • Do C to F conversions • VII. Stat analysis • Skip this section

  26. Graphing data Exercise 1.7 (p 22) • Follow instructions on proper labeling of graph and graph data given in table. (CAN COMPLETE AT HOME) • VIII. Sci Notation • Read and do exercise (can complete at home) • IX. Medical importance • Do medical calculations (can complete at home) • Lab Questions p25-26 • Can complete at home • Some quiz questions may be taken from these.

  27. Scientific Method • Unit 2

  28. We will set up the scientific method experiment today and will work on it for the next 2 weeks. • Mealworm or Tenebrio molitor • Weigh mealworm this week • Place in one of 2 substrates • Oat bran or peat moss • Reweigh next week • Do statistical analysis of data (weight gain or loss) to determine which substrate best supported growth of the mealworm

  29. Independent variable • What the investigator varies • Type of substrate • Dependent variable • What is measured or counted • Change in mass of mealworm • Control variables • Amount of water, amount of substrate, light conditions, others

  30. Review Scientific Method Terminology • Hypothesis • Steps on scientific method • Discuss with your lab group a valid hypothesis for your mealwork experiment.

  31. Scientific Research Articles • Scientists must publish their research in a peer-reviewed journal for the information to be a part of scientific knowledge. • Your lab reports will be similar to these research articles and will contain the following 5 sections. • Abstract • Introduction • Materials and Methods • Results • Discussion

  32. Research articles

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