Virginia SOL 6.7.a
The Standard
air is a mixture of gaseous elements and compounds
Virginia Standards of Learning for Science
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students explain that air contains several gases mixed together. They identify gases such as nitrogen and oxygen as elements, and carbon dioxide and water vapor as compounds.
What Mastery Looks Like
- Given a particle diagram of air, students identify the sample as a mixture and classify its gases as elements or compounds. They explain that the gases keep their own properties.
Common Misconceptions
- Students often think air is only oxygen, or that it is a single compound. They may also think any two-atom molecule, including N₂ or O₂, is a compound.
How to Assess It
- Exit ticket: Name two gaseous elements and two gaseous compounds found in air, then explain why air is a mixture.
Lesson moves
Ways to Teach It
Use 100 molecule cards to build an air model, then color-code nitrogen, oxygen, carbon dioxide, water vapor, and other gases.
Write and defend a response to: Why is air a mixture rather than a single substance?
Sort cards labeled N₂, O₂, Ar, CO₂, H₂O, and Ne into element or compound groups, then check with a partner.
Compare a weather report's humidity with an atmospheric composition chart, then explain why water vapor changes while nitrogen stays nearly constant.
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Printable 6.7.a Worksheet
A ready-to-print activity worksheet aligned to 6.7.a, with an answer key for the teacher on its own page. No account needed.
PDF, US Letter, prints cleanly in black and white.
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Related Standards
- 6.7
The student will investigate and understand that air has properties and that Earth's atmosphere has structure and is dynamic. Key ideas include
- 5.7.a
matter is composed of atoms;
- 6.5.g
a few elements comprise the largest portion of the solid Earth, living matter, the oceans, and the atmosphere.
- 6.7.b
the atmosphere has physical characteristics;
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