Name_____________

Graphing exercise

1.)    Look at the 5 pieces of wood.  Would they all float in water?  Why or why not?

2.)    What is the relationship between the mass and volume for different pieces of the same kind of wood? (direct or indirect and why)

3.)    Sketch a graph of the mass (on the y) and the volume (on the x) of what you think your graph will look like. (label your axis)

4.)    We will now measure the mass and volume for 5 pieces of wood.  Round the mass and volume to the nearest whole number and put in the chart below.

5.)    Construct a graph by putting the mass (on the y) and the volume (on the x). Be sure to label each axis and also give your graph a title.

6.)    Now that you graphed the actual data, what appears to be the relationship between the mass and volume for a piece of your wood?  Explain how you know.

7.)    Next fill in the last column of this chart by taking the mass divided by the volume. (round to 2 decimal places) What do you notice about these numbers? Find the average of these numbers and write it here. ______________________. What are the correct units for your number? _____________________

8.)    How does question 7 help to explain why both pieces of the candle sank in jar B but floated in jar A? (Hint what stays constant about each piece of wood?)

9.)     Jar B contained ethanol, which has a density of 0.79 g/cm³ and Jar A contained water, which has a density of 1.00 g/cm³.  Using this information what do you think the density of the candle is?  EXPLAIN WHY.

10.)                        Would you expect the wood to float in water? Ethanol?  Explain why.

11.)                        If you repeated this experiment but instead of using pieces of wood, used pieces of Styrofoam, would your graph look the same or different? Explain why.

12.)                        Predict the following:

a.)    What would be the mass of a piece of wood that had a volume of 150 cm³?

b.)    What would be the volume of a piece of wood that has a mass of 25 grams?