Density Power Point By SUHSD Science Resource Personnel

Introduction: How are coke/diet coke different. 1 Introduction: How are coke/diet coke different? 1. What do you expect to happen when I place the coke into the graduated cylinder of water:

2. What happened? 3. Now predict what will happen when I place the diet Coke into the graduated cylinder. 4. What happened? 5. What property accounts for the difference in the two types of soft drinks? 6. How could I make the coke float? 7. What did I do to make the coke float? Conclusion: what did you learn from this demonstration? (full sentence/s)

One thing that we know about density is that substances, solid or liquid, that are less dense will float in liquids that are more dense. Now order the following in terms of increasing density (smallest to largest): coke, diet coke, water and salt water ___________< ________ < ___________ < _________

What can you tell us about the density of water, alcohol, & ice cubes? Ice is (more/less) dense than liquid water? (circle one) Ice is (more/less) dense than rubbing alcohol (circle one) Liquid water is (more/less) dense that rubbing alcohol? (circle one) Place in order of increasing density: _____________ < ____________________ < ________________

Examples: An object has a mass of 5g and occupies a volume of 15ml, what is its density? D= m v D = 5g 15ml D= 1 g/ml 3 D= .33 g/ml

Examples: 2. An object with a mass of 10 g. It is placed in a graduated cylinder which contains 50ml of water, and the water rises to 70ml. What is the object’s density? D = m/v D= 10 / (70-50) D= 10/20 D= .5 g/ml

Examples: 3. A sample with a density of 3.75 g/ml has a volume of 10.44 ml. What is the mass of the sample? D = m/v 3.75g/ml = x /10.44ml X = (3.75 g / ml ) x (10.44ml) X = 39.15 g