Density Lab:
Look at two sample cylinders. Even though the cylinders are the same size and shape, one has a greater mass than the other. Both cylinders are solid and are not hollowed out anywhere inside.

1. Look at the drawing of the copper and aluminum cubes and their atoms. What are two possible explanations for why

a copper cube has a greater mass than the aluminum cube?

Hint: Just because the aluminum atoms are larger, they are not necessarily heavier.

Explanation 1:

Explanation 2:

2. The density of a substance like copper or aluminum is its mass divided by its volume (how much space it takes up). Density = mass/volume or D = m/v. Which is more dense, copper or aluminum? How do you know?

3. **How do you find the density of a cube? Cylinder?

4. **How do you find the volume of a cube? Cylinder? 5. Volume of a cube (length)*(width)*(height) 6. Volume of a Cylinder (pi)*(diameter/2)^2*(height) 7. 8. 9. **How do you find the mass of a cube? Cylinder? 10. Multiply volume and the density 11.

12. Calculate the density of a cube using the following information:

0 Each side is 4 cm long.

1 The mass of the cube is 128 g.

13. Calculate the density of a cylinder using the following information:

* The diameter of the cylinder is 5cm * The height of the cylinder is 7 cm

ACTIVITY

Your group will work with eight samples each with the same volume, but made of a different material. Carefully measure the mass of each sample and calculate the density.

Can you use density to identify eight cylinders made of different materials?

How can two objects, which are exactly the same size and shape, have a different mass?

Procedure

1) 2)
3)
4) Etc….

Create a data table for measurements
Create a calculation section

Conclusion: EXPLAIN IT WITH ATOMS & MOLECULES

The size, mass, and arrangement of atoms affect the density of a substance. Explain this to a 5th grader using examples and diagrams. Label diagrams as necessary.