DensityDefinition- the ratio of the mass of an object to it’s volume

What’s the definition of mass again? volume?

Density is a physical property used to describe how tightlypacked the molecules are in the object.

Which is more dense….a pound of feathers or a pound of iron?

Equation- D = m v

Let’s try some Practice Problems from the overhead.

Title- Density of Oil vs. Water LabPurpose-Materials-Procedure- 1.

2. 3.

etc….Data Tables- one for water and one for oilGraph- title, labels, units, 2 data sets, slope for each lineConclusion Questions

1. Does changing the volume of the water (or oil) change the density of the water (or oil)? EXPLAIN USING YOUR DATA and GRAPH!

2. Do different liquids have different densities? EXPLAIN USING YOUR DATA and GRAPH!

Graphing

• Use LoggerPro• X-axis is volume- 10 mL, 20 mL, 30 mL• Y-axis is mass of WATER- in grams• Go to DATA then select NEW MANUAL COLUMN to get a

2nd y-axis • 2nd Y-axis data set is mass of OIL- in grams• Double click on graph to set scale from

0 to 40 for both the x and Y axis• Double click on graph, go to AXES OPTIONS and check the

box that says mass of oil to see the 2nd data set on your graph

• Go to ANALYZE then LINEAR FIT to get the slope of each line- THAT IS THE DENSITY!!!!