2. oneone CS-6A Objective: To calculate density given mass and volume in order to explain how density is a characteristic property. CSI Note: How is density different from mass? IS YOUR HOMEWORK OUT?? Drill: 1. Get a Lesson Sheet from the SET. 2. Complete the Drill portion only.

3. oneone CS-6A Think about a pound of gold and a pound of marshmallows. Answer each question below. Think carefully!!! Which one weighs more? ____________ Which one takes up more space? _______ Which one has more mass? ____________

4. oneone CS-6A Definition: Density – the amount of matter (mass) in a given space (volume) – the mass per unit (1) volume ???? What word could you use to represent the concept of density???? ???? How can you show density? ???? ???? How can you explain the density of a single substance????

5. oneone CS-6A Let’s explore the units: g/mL or g/cm 3 What does this mean? The number of grams in 1 mL of a substance or… The number of grams in 1 cm 3 of a substance

6. oneone CS-6A To find the density: Divide the mass by the volume. Density = Mass ÷ Volume

7. oneone CS-6A Ex. 56 g of ONK takes up a space of 7 cm 3. What is its density? Density = Mass ÷ Volume Density = 56g ÷ 7 cm 3 Density = 8 g/cm 3

8. oneone CS-6A **The density of a substance at a given temperature is the same for all samples of that substance, thus making density a characteristic property.

9. oneone CS-6A Calculate the density: Show 3 lines of work. (2 decimal places) Substance 1: Mass = 85 gVolume = 10 cm 3 Density = Mass ÷ Volume Density = 85 g ÷ 10 cm 3 Density = 8.5 g/cm 3

10. oneone CS-6A Calculate the density: Show 3 lines of work. (2 decimal places) Substance 2: Mass = 150 gVolume = 2.5 cm 3 Density = Mass ÷ Volume Density = 150 g ÷ 2.5 cm 3 Density = 60 g/cm 3

11. oneone CS-6A Calculate the density: Show 3 lines of work. (2 decimal places) Substance 3: Mass = 33.92 g Volume = 3.2 cm 3 Density = Mass ÷ Volume Density = 33.92 g ÷ 3.2 cm 3 Density = 10.6 g/cm 3

12. oneone CS-6A If you had 200g of Substance 1, what would the density of the substance be?

13. oneone CS-6A If you had 5.0 cm 3 of Substance 2, what would the density of the substance be?

14. oneone CS-6A If you had any amount of Substance 1, what would the density of the substance be?

15. oneone CS-6A WHY???? Density is a characteristic property!!! It does not change for a given substance!!!

16. oneone CS-6A HOMEWORK: 1.Complete Ditto. 2. Drop objects in water and write your observations. (Maybe a chart)