 The Metric System, Equipment & Graphing Chapter One.

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The Metric System, Equipment & Graphing Chapter One

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??

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)

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!

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!

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!

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

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

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

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

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!