Investigation 3 2 air is matter 2010Presentation Transcript
What’s wrong? Identify 9 different safety concerns shown in the picture below. Image: http://morrisonlabs.com/lab_safety.htm
The answers are … Image: http://morrisonlabs.com/lab_safety.htm Always wear safety goggles during a lab. Don’t leave materials laying on the floor. Clean up spills immediately Don’t heat closed containers. Keep your lab area neat and clean. Unplug equipment when not in use. Don’t place lab materials near the edge of the table. Keep papers and other flammable objects away from flames. Don’t smell directly from a container - WAFT.
Everything is made of elements. What elements could be in the gas that forms when sodium bicarbonate (NaHCO 3 ) and citric acid (C 6 H 8 0 7 ) react?
What gas do you think is in the bubbles that form when NaHCO 3 and C 6 H 8 0 7 react?
What is air?
How do you know when something is a gas?
What is gas made of?
How do you know when something is matter?
Is gas matter?
Work alone with one system or with a partner using two
Clamp the tubing with the binder clip
Work with or without air in the syringe
Does air take up space?
What is your evidence?
Does air always take up the same amount of space?
Gases in air have mass and occupy space
Therefore air is
Air can be forced into a smaller space
Air that is forced into a smaller space is called COMPRESSED air
When the force is removed, the air
EXPANDS and occupies more SPACE
Air is composed of particles too small to see
Particles are in constant motion
There is SPACE between the particles of air
Reflection page 24
Using what you know about the particulate model, illustrate a gas that has been compressed and one that has been expanded