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The Metric System, Equipment & Graphing Chapter One

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Mathematics is the Language of Science. Quantitative vs. Qualitative –Quantitative includes NUMBERS –Qualitative is a description – feels cold, bubbling, strong smell Scientists collect data using the METRIC SYSTEM. –Can you name a country (other than the US) that does NOT use the Metric System??

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The Metric System Kilo (K) Hecto (H) Large Measurements Deka (Dk) –Add a BASIC UNIT to the end of each prefix, such as Gram, Meter, Liter, Second. Deci (d) Centi (c) Small Measurements Milli (m)

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Metric Conversions Scientists often have to convert from one metric measurement to another. Example Problem: A roll of copper wire contains 15 m of wire. What is the length of the wire in centimeters? To answer the problem, use the LADDER method!

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The Ladder Method *See Handout* King Henry Died Problem: Convert meters to centimeters. By -Start at meters (basic unit). Drinking -Move decimal 2 places to the right. Chocolate Milk Let’s try the handout!

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Chemistry Equipment *See Handout* There are lots of equipment that you will need to recognize in the lab. You will have a few days to learn these names! Then….a quiz!

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Organizing Data Line Graphs – used to show changes in data Bar/Pie Graphs – used to compare data

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Anatomy of a Graph X – axis – horizontal –The Independent Variable Y – axis – vertical –The Dependent Variable Legend – identifies lines Title Axes Labels Clients in the 1990’s Years

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Analyzing Data Data often has to be calculated. These are common calculations you should be able to do: Mean - average Median – middle number Mode – most repeated number Range – largest minus smallest number Calculate the following data: Student A4 Student B3 Student C3 Student D2

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Example Problem Mean Median Mode Range Calculate the following data: Student A4 Student B3 Student C3 Student D2 4+3+3+2 = 12 12 / 4 = 3 3 (it falls between 4 and 2) 3 (it’s the most repeated) 4 – 2 = 2

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Can you make a line graph using Microsoft Excel? Make a graph using the Popcorn Lab data! *See Handout for directions* Be sure to include your calculations!

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