Oxygen / Oxides Flashcards
What is the percentage of nitrogen in the air?
78%
What is the percentage of argon in the air?
About 1%
What is the percentage of oxygen in the air?
21%
What is the percentage of Co2 in the air
0.04%
USING COPPER TO INVESTIGATE PROPORTION OF O2 IN AIR
Copper + oxygen –> ?
Copper (II) oxide
Balance :
Cu + O2 –> CuO
2Cu + O2 –> 2CuO
USING COPPER TO INVESTIGATE PROPORTION OF O2 IN AIR
Method :
Heat _________ of copper in a tube & pass _____ over it using two ________. Use the markers on the _________ to work out how much O2 been used up.
Excess
Air
Syringes
Syringes
USING IRON TO INVESTIGATE PROPORTION OF O2 IN AIR
Iron + oxygen + water –> ?
Iron oxide (rust)
USING IRON TO INVESTIGATE PROPORTION OF O2 IN AIR
Method :
First soak some _____ _____ in ________ acid. Turn the ______ upside down and put into a _______ of water. The _____ will soak up the oxygen. The water should rise/fall to fill the place of the oxygen.
Iron wool Acetic Test tube Beaker Iron Rise
USING IRON TO INVESTIGATE PROPORTION OF O2 IN AIR
Work out the percentage of O2 used up by working out the …..
Difference between start and end volumes
LAB PREPARATION OF O2
H2O2 –> ? + ?
Then balance
H2O + O2
2H2O2 –> 2H2O + O2
LAB PREPARATION OF O2
What is H2O2
Hydrogen peroxide
LAB PREPARATION OF O2
What is the name of this type reaction –>
2H2O2 -> 2H2O + O2
Decomposition reaction
LAB PREPARATION OF O2
2 collection methods
Over water - use delivery tube to bubble gas into upside down measuring cylinder
Gas syringe
What’s the reaction between magnesium and oxygen
Magnesium + oxygen –> magnesium oxide
2Mg + O2 –> 2MgO
Magnesium + oxygen
Magnesium burns with a _______ _________ flame in air.
________ powder formed is ___________ ___________ - which is flighty _______ dissolved in water
Bright white
White
Magnesium oxide
Alkaline
What’s the reaction between carbon and oxygen
Carbon + oxygen –> carbon dioxide
C + O2 –> CO2
Carbon + oxygen
Carbon will only burn if very __________ heated. It burns with a ________/________ flame and produces _________ __________ gas. Which is slightly ___________ dissolved in water.
Strongly
Orangey/yellowy
Carbon dioxide
Acidic
What is the reaction between sulfur and oxygen
Sulfur + oxygen –> sulfur dioxide
S + O2 –> SO2
Sulfur + oxygen
Burns in air / oxygen with a _______ _________ flame and produces ________ __________. This is _________ when dissolved in water.
Pale blue
Sulfur dioxide
Acidic
