9 th Grade Physical Science-C
Unit 2. Get a Charge Out of Matter
Activity #2B: Sketching Molecular View of Particles
To Begin
#2B
You made models of atoms, elements, molecules and compounds . You discussed homeogenous and heterogenous mixtures . You have identified examples of pure substances and of mixtures .
In this activity you will work to complete sketches of increasingly microscopic views of particles. You have an opportunity to define terms and add sketches to your comp book.
Learning Goals for this activity
Students will identify and/or sketch each of the following: element, compound, molecule, atom, pure substance, mixture, homogeneous and heterogeneous.
Process & Procedure
Discuss the example presented by your teacher with your team. Complete this worksheet on your own…only seek help from your team if you need it.
1.
This substance is gold. Complete the sub-microscopice view of gold. Sub-microscopic views look at the atomic make-up of the individual particles that make up a material.
2.
From the example of gold (above), explain the difference between the element gold and a gold atom.
3.
The substance is carbon dioxide (gas), CO
2
. Complete the microscopic and sub-microscopic views of CO
Connect the sub-microscopic view to a CO
2
2
.
molecule. Carbon atoms should look different than oxygen atoms.
4.
The substance is air

(gas). Air is a mixture of approximately 78% nitrogen and 20% oxygen gas. The other 2% is a combination of water vapor, CO2, argon gas and other gases. For the purpose of this sketch, lets assume a total of 10 particles in the microscopic view…7 are N
2
(nitrogen gas), 2 are O
2
(oxygen gas) and 1 is H
2
O gas. Complete the microscopic and sub-microscopic views of air. Connect a sub-microscopic view to one nitrogen gas molecule; connect a different sub-microscopic view to an oxygen gas molecule; connect the last one to a water molecule. All the different types of atoms should look different from each other.
5.
Did you draw your microscopic view of air as a homogenous or a heterogenous mixture. Explain.
6.
On the right, draw the microscopic view of the same set of air particles (as above).
Have them represent the opposite type of mixture as you drew above (either homogenous or heterogenous).
7.
On the left, draw the microscopic and sub-microscopic views of a homogenous 50:50 mixture of Ar (argon gas) and O
3
(ozone gas).
8.
Explain this statement while defining the bolded terms, and give an example.
Any aqueous solution always uses water as the solvent .