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

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.

Agenda

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

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.

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?

“Compactness”

Low density

High Density

In terms of our density column….rubbing alcohol baby oilvegetable oil water corn syruphoney

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.

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)

To find the density of an object1- Find the mass of the object

2- Find the volume of the object

3- Divide

Density = Mass

Volume

Units for density g/cm3 or g/ml

M = mass V= volume D = density

M = D x V V = M / D D = M / V

How do you find mass?

ScaleBalance 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.

How do you find volume?

Regular ShapesRuler

Irregular Shapes/liquidsGraduated cylinder

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

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