Science Period 4
In class we discussed the ingredients in air:
-78% Nitrogen – a non-reactive gas
-21% Oxygen – essential for life, reactive with materials in combustion (causing fire).
-0.9 % Argon – a non-reactive gas. Used in lightbulbs!
-0 to 4% Water Vapor – changing amount changes the humidity
-0.04% Carbon Dioxide – bi-product of combustion and respiration. A “greenhouse gas.” The amount in the atmosphere is increasing with use of fossil fuels. We talked about how 0.04% can also be written as 400 ppm (parts per million).
We also finished up the properties of air stations and spent some time debriefing.
HW – Work on adding details to your written responses for the properties of air stations.
Science Period 2 and 3
In class we explored a CO2 fire extinguisher: https://youtu.be/1z_ApF2n-5Y
We used this to think about how gases behave like fluids. The more dense CO2 in the jar pours down onto the table, pushing the air with O2 in it out of the way, putting out the candles that need O2 for combustion to happen.
We then spent time making connections between our exploring air stations and the properties of air.
Finally, we started taking notes on the Particulate Model of Matter.
HW – Study ingredients of air for a quiz coming up at the end of the week (tomorrow for P3, Friday for P2).