Making and Using Gases Flashcards
Examples of noble gases
Helium, neon, krypton, xenon, argon
Air is made up of
Elements: Oxygen 21%, Nitrogen 78%, Noble gases <1%
Compounds: Carbon dioxide 0.033%, water vapour
How do you make liquid oxygen or nitrogen?
Cool and compress (applying high pressure)
Why is air not a suitable source for carbon dioxide?
Very small quantities exist in the atmosphere
What shows a gas has been made?
Mass lost as gas escapes or effervescence (bubbling)
Test for oxygen
Relights a glowing splint
Test for carbon dioxide
Bubbling through limewater turns cloudy/milky
Test for Hydrogen
Lit splint squeaky pop
Collision Theory
Collisions can be made to take place more often and how reactions can be speeded up.
A concentration increase
Increase the concentration leads to more particles to collide with.
A concentration decrease
Decrease the concentration leads to less particles to collide with.
A decrease particle size
Decreasing particle size increases the surface area so more surfaces for the particles to collide with
An increase particle size
increase particle size decrease the surface area so less surfaces for the particles to collide with
An increase temperature
increase the temperature gives the particles more energy so more collisions occur
A decrease temperature
decrease the temperature gives the particles less energy so less collisions occur
