1. Gases around us
2: The particle model of matter
3. Air
4.Air pollution
100
Name one invisible gas.
O2, CO2, N2...
100
what particle model is this?
Gas
100
Layer of air around the Earth
Atmosphere
100
(v.)Making air, water, or land dirty with harmful things.
Pollute
200
can not be seen
Invisible
200
particles vibrate(震动) in fixed position.
Solid
200
One part that sits on top of or below other parts in something
Layer
200
Name 3 types of pollution
Air, water, land, noise, light....
300
Gases around us
Gases are all around us, for example air. Gases are also in fizzy drinks and inside bicycle and car tyres. We don’t always know that gases are there because we can’t see most gases. These gases are invisible. We also can’t smell or taste many gases around us.
Question：Where can we find gases around us?
In fizzy drinks and inside bicycle and car tyres.
300
Which states of matter have fixed volume?
Solid and Liquid! (2 answer!)
300
______________is a gas that's all around us, but we can't see it because it's part of the air. It is about 78% of the air we breathe.
Nitrogen
300
Name 3 outdoor air pollution
Smoke , dust, gases from factory, power station, cars, trucks...
400
Name one visible gas
SO2, Cl2
400
1. Which states of matter can be compressed?
2.Which state of matter has the highest kinetic energy of particles?
1.Gases can be compressed.
2.Gases.
400
Composition of the air.
400
Name 2 indoor air pollution
Smoke from cigarettes, cooking, painting...