Lesson W2B.  Volume vs. height  Trendlines  W2:  Completion: XX pts  Problem...

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Presentation transcript:

Lesson W2B

 Volume vs. height  Trendlines

 W2:  Completion: XX pts  Problem...

 Quiz S3  15 min  When done, get a computer, start it up, and try to graph your data from yesterday

 First, we will all make a graph using the sample data on Google classroom  Then, you will graph your own data

Choose the shape that looks like your data Your R 2 should be as close to 1 as possible

 Your graph (from the sample data) should have a:  Title  Axis labels (x-axis & y-axis)  Trendline  Equation  R 2 value  Save it as: LASTNAME_Raindrop lab.xlsx

 Make 3 graphs in MS Excel  Save the graphs in MS Excel  Copy the graphs to a new Google doc following the Google classroom link  Finished early? Work on the HW analysis questions

 See slides after ET...

 ET: Thinking about graphing  HW: W2B

 What would be a better rain gauge, a beaker or the Florence flask? Why?

 Volume increases steadily and predictably  Can use a straight line to predict an unknown volume

 Proportional – two variables are directly proportional when you can multiply the value of one by a constant to obtain the value of the other  Data lying a straight line passing through zero is proportional

 Height and volume within the beaker are proportional – straight line on graph  This is not true for the Florence flask

 “Well, if the beaker is such a great rain gauge, why didn’t ALL of the data points fall on the trendline?”

 No matter how careful chemists are, they make small errors in their measurements  This is why chemists often average out several measurements to get accurate data

 # stairs is proportional to height of stairs  Distance driven at given speed is proportional to amount of time  # pages in book is proportional to thickness of book

 Bigger diameter, more rain collected

 Volume of rain is directly proportional to height of water measured  Graphs of two variables that are proportional include a straight best fit line through the origin (zero)  Predictions of proportional values can be made if one value is known

 Suppose you have a cylindrical rain gauge with 8 mL of rain that measures 2 cm in height. How could you predict the volume of rain if 10 cm of liquid was collected in the rain gauge?