1. Fluids Density

2. What is Density? In the last activity, you discovered that no matter how much substance you used, the mass-to-volume ratio stayed the same. This ratio is density. Density – A measure of the amount of matter (mass) per unit volume of a substance. Density can be determined using an equation The common units of measurement for density of solids and liquids are g/mL or g/cm ³, and for gases, kg/m ³.

3. Calculating Density An empty container has a mass of 50g. When 75mL of oil are placed in it, the total mass is 120g. Calculate the density of oil. Given:mass of container = 50g mass of container & oil = 120g Volume of oil = 75mL 1. Need to find mass of oil first: Mass = 120g – 50g = 70g 2. Use the formula to find density: Density = mass/volume = 70g/75mL = 0.93g/mL Therefore, the density of the oil is 0.9g/mL.

4. Floating Coke Demo Floating/Sinking Coke? T/P/S: Based on the demonstration and on the density formula, how would you … a) Increase density? b) Decrease density? c) Real-life examples?

5. Density & The Particle Theory You can use the particle theory to help explain density: ◦Particles of a solid are usually more closely packed than particles of a liquid, which are more closely packed than particles of a gas. ◦Therefore, solids are generally denser than liquids, which are denser than gases. Density is also affected by the type of particles a substance is made of. ◦Oil and water are both liquids, but water is much denser. ◦Helium is much less dense than air.

6. Density & Floating Eggs With the materials, follow the instructions provided to complete the lab. Using the particle theory, explain how density affects each egg (tap water & salt water). Use a diagram to explain each. Video: Floating EggFloating Egg Video: Density & Temperature: Underwater VolcanoDensity & Temperature: Underwater Volcano McSteiger Science: Floating Eggs & Underwater VolcanoFloating Eggs & Underwater Volcano

7. Density of Some Common Materials

8. Homework Questions 1. Use the particle theory to explain densities in solids, liquids, and gases. 2. Calculate the density of a diamond if the volume of the diamond is 0.50cm and its mass is 1.75g. 3. To prep for the upcoming lab, research the densities of:  Water, Rubbing Alcohol, Maple Syrup, Laundry Detergent, Vegetable Oil

9. Science Lab: Layer Liquid Introduction: Seven Layer DensitySeven Layer Density Lab Prep: ◦Read over lab handout ◦Complete a hypothesis & variables ◦Create the necessary tables for observations

10. Lab Chart Example - Liquids FluidDensityObservations Water Rubbing Alcohol Maple Syrup Laundry Detergent Vegetable Oil

11. Lab Chart Example – Gas & Solids Fluid/ Object ObservationsDensity (Description) Air Bubble Wooden Bead Plastic Gem Bolt Popcorn Kernel