1. Bellringer: If you pour together liquids that do not mix they will form layers. Which liquid do you think will sink to the bottom? Why? rubbing alcohol corn syrup vegetable oil water honey baby oil

2. Liquid Layers If you pour together liquids that don’t mix and have different densities, they will form liquid layers. The liquid with the highest density will sink to the bottom. The liquid with the lowest density will float on top.

3. Agenda  Liquid Layer Activity (10)  Notes and Guided Practice (20)  Density Problem Solving (10)  Reflection and Exit Ticket (5)

4. Objectives We Can…  Compare the densities of water, common household liquids, and solids.  Explain the relationships between volume, mass, and density of substances.  Illustrate differences in density at the atomic level.

5. Density is the measure the amount of stuff in a given space. More scientifically, it is the amount of mass in a given volume All substances have density including liquids, solids, and gases What is Density?

6. “Compactness” Low density High Density

7. In terms of our density column…. rubbing alcohol baby oil vegetable oil water corn syrup honey

8. Density and Atomic Mass A Sulfur atom has about 32 times the mass of a Hydrogen atom. This means that a piece of Sulfur would be denser than Hydrogen unless the Hydrogen was greatly compressed. Atoms that have higher atomic numbers have greater mass. Materials with atoms of higher atomic mass can have fewer atoms for a given volume, but still have greater density.

9. The structure of the molecule affects density. Molecules may have structures that force atoms further apart leading to lower density. Liquid Water Solid Water (Ice)

10. To find the density of an object 1- Find the mass of the object 2- Find the volume of the object 3- Divide Density = Mass Volume

11. Units for density g/cm 3 or g/ml M = mass V= volume D = density M = D x V V = M / D D = M / V

12. How do you find mass? Scale Balance with known weights Mass v. Weight  Mass is a property that does not change whereas weight depends on the pull of gravity.  On earth, we generally use weight as a measure of mass but that only works at this gravity.

13. How do you find volume? Regular Shapes  Ruler Irregular Shapes/liquids  Graduated cylinder

14. What about our density column? If we used the same volume of each liquid, which would weigh the most? If we weighed out the same mass of each liquid, which would have the most volume? Water has a density of 1 g/mL. Which liquids would have a density of more than 1 g/mL? rubbing alcohol baby oil vegetable oil water corn syrup honey

15. Please complete the rest of the sheet. Feel free to work cooperatively and ask for help if you need it