4. A student measured the mass and volume of five blocks of the same material and recorded the data in the following table:
Mass (g) 1248 16 Volume (cm3 Density (g/cm3
) )
a. Copy the table and use the formula for calculating density to complete it. b. Use the data in the table to draw a graph showing mass on the x-axis and volume on the y-axis. c. Do you recognise a pattern in your graph?
d. If you take any point on your graph and divide the mass value by the volume value, what can you conclude?
5 10204080
EXPERIMENTAL INVESTIGATION 26.1 How can we compare the density of irregular solids?
Equipment Mass balance Overflow can Graduated cylinder Water
Suggested substances to test Stone
Glass bead Metal
SAFETY • Be careful of any sharp edges on substances being tested.
• Clear up any spills immediately.
Method 1. Place the irregular solid on a mass balance and record its mass.
2. Using the method on page 245, calculate the volume using an overflow can, graduated cylinder and water. You may need to use a pin to force the object underwater if it floats.
3. Follow steps 1–2 with different irregular solids. 4. Calculate the density of each solid by dividing its mass by its volume. Record your results.
Water String
Mass balance
Overflow can Stone
g
Block :Fig. 26.3 To compare the density of irregular solids j Go to page 75 of your Experimental Investigations Log to write up this investigation.