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Let’s Review What We’ve Learned so Far…

Let’s Review What We’ve Learned so Far…. What You Should Know:. 1) Lab Safety Can you demonstrate safe practices during lab and field investigations? Can you demonstrate an understanding of the use and conservation of resources and the proper disposal or recycling of materials?

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Let’s Review What We’ve Learned so Far…

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  1. Let’s Review What We’ve Learned so Far…

  2. What You Should Know: • 1) Lab Safety • Can you demonstrate safe practices during lab and field investigations? • Can you demonstrate an understanding of the use and conservation of resources and the proper disposal or recycling of materials? • 2) Scientific Method • What is science? • What are the steps to the scientific method? • Why is it important to have several trials in an experiment? • What are the independent and dependent variables? How do they fit in a hypothesis? What is a hypothesis?

  3. From your assigned readings you should also know: • Definition of a theory: Theories are based on natural and physical phenomena and are capable of being tested by multiple independent researchers. • Unlike hypotheses, scientific theories are well-established and highly-reliable explanations, but they may be subject to change as new areas of science and new technologies are developed. • Can you distinguish between a scientific hypothesis and a scientific theory?

  4. Let me pick your brain… Theory or Hypothesis? • If I use miracle grow my plants will grow more quickly than if I use normal water. • Plants and animals evolve slowly over millions of years. This is supported by the fossil record as well as the living record. • If there are not enough animals to hunt, Wild dogs will scavenge for food. • Light travels at a constant speed and nothing can travel faster than light. This is defined by Einstein’s equations of relativity.

  5. Meters, Grams, and Liters…oh my! On to the lesson for today…The Metric System! [start clapping out of joy]

  6. Back in the day… • People used to use parts of their body to determine the length of something. • The standard would be a part of the king’s anatomy. • The standard yard was the distance from the king’s nose to his outstretched arm

  7. The English system is very confusing because it has so many different values

  8. America is one of the only countries that still uses the old English system

  9. Scientists needed an exact and uniform system of weights and measurements…hmm Scientists give the English system the thumbs down

  10. The metric system was the answer!  • The metric system is a decimal system of measurement whose units are based on certain physical standards. • It is scaled on multiples of 10, which makes using it super easy and a lot less confusing (Yay!)

  11. During the 18th century, scientists measured the distance from the earth’s equator to its North Pole and divided it into ten million parts. • This is how they came up with the length of the standard meter. How did the metric system come about?

  12. Meters measure length or distance. The standard for the meter is kept in a safe in France. The meter stick is a replica of that standard A meter is made up of 100 centimeters and 1000 millimeters One millimeter is about the thickness of a dime The Meter

  13. Scientists needed a standard to measure mass. • Grams measure mass or the weight of an object. • They decided to take one cubic centimeter of water and call it a gram. 1 gram weighs about as much as one small paperclip. How the Gram came about…

  14. Liters measure volume or the amount of a liquid. • Scientists needed a way to measure liquids so they took 10 cm and multiplied it by its length x width x height to come up with a standard for measuring volume. • The liter is the size of 10 cm(3) • 10cm x 10 cm x 10 cm • Length x Width x Height = Volume How the liter came about… A 2 liter Coke bottle is…well 2 liters!

  15. Two different groups of scientists were working on the calculations to send a probe to Mars. The American team did their calculations in the English standard and the other team did it in the metric system (OOPS!) MARS Uh Oh!

  16. It cost the space program 125 million dollars. It cost the scientists their time. This is why it’s important to have and use a universal standard of measurement. This made scientists very upset.

  17. The Metric Chart

  18. Changing Metric Units • To change from one unit to another in the metric system you simply multiply or divide by a power of 10. • To change from a larger unit to a smaller unit, you need to multiply (move the decimal to the right). • To change from smaller units to larger units you divide by a power of ten (move the decimal to the left). • 1000mm ÷ 10 = 100cm • 100cm ÷ 10 = 10dm • 10dm ÷ 10 = 1m • 1 km x 1000 = 1000 m • 1 m x 100 = 100 cm • 1 cm x 10 = 10mm

  19. 100cm = ___ m • 6.9mm = ___cm • 5kg = ___mg • 7.3mL = ___L Show me you haven’t fallen asleep!

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