3. Introduction to Density A substance’s density is the measure of the mass of material within a certain volume . (amnt of space taken up) The mass (amnt of particles) is affected by how tightly packed the molecules are within the space.

4. Introduction to Density A B A and B = SAME VOLUME (same size)

5. Introduction to Density A B A and B = SAME VOLUME (same size) A B A and B = DIFFERENT MASS (amount of particles; different substance) Different Densities

6. Introduction to Density C D C and D = DIFFERENT VOLUME (different size) but same substance

7. Introduction to Density C D C and D = DIFFERENT VOLUME (different size) but same substance Same Densities- particles are packed the same way

10. Table 1: Data for objects 1-4 Subtract Final Volume from Initial Volume Object # Mass (g) Initial Volume (mL) Final Volume (mL) Object Volume (mL) 1 5 2 5 3 5 4 5

11. Subtract Final from Initial Table 2: Data for Objects 5-11 Divide Mass by Object Volume Object # Mass (g) Initial Volume (mL) Final Volume (mL) Object Volume (mL) Density (g/mL) RESULTS (S= sink; F=floats) Water Ethano Gasoline Sea H 2 O 5 6 7 8 9 10 11

12. Subtract Final from Initial Table of Densities Substance Density (g/mL) aluminum 2.7 copper 8.9 gasoline 0.68 gold 19.3 ice 0.917 iron 7.8 lead 11.3 seawater 1.025 wood (average value) 0.8