OC24 prepare a sample of oxygen by decomposing H2O2 using MnO2 as a catalyst (word equation and chemical equation)
Peroxide ▬▬▬▬▬▬▬▬▬▬► Water + Oxygen
H2O2 is broken down by the aid of a catylst
the flask the reaction occurs in is called a Buchner flask
- Set up apparatus as in the diagram. Ensure the seal on the buchner flask is tight, the water is above the beehive shelf
- Add a small amount of Manganese Dioxide to the flask.
- Allow some Hydrogen Peroxide into the flask. Write down your observations
- Flood a Gas Jar with water, inverted (upside down) place the open end over the hole in the beehive shelf
- Flood another jar in readiness for filling the 1st.
- Discard this 1st Jar (mainly Air)
- Continue to add more Hydrogen Peroxide
Place a lit splint in to the gas jar. Write down your observations
The Splint Burns brightly
Place a glowing splint into the gas jar. Write down your observations
The Splint RELIGHTs
Pour some Limewater in the Jar. Write down your observations
There is no effect
Pour the contents onto a lit candle Write down your observations.
Nothing observed / candle burned brighter
Burn Magnesium, Write down your observations
Magnesium burns very brightly
Burn Magnesium in the Gas Jar Write down your observations.
Magnesium burns amazingly brightly
Pour some water into the spent gas jar and test with Litmus papers Write down your observations
Litmus paper turns Blue, indicating a base
The Characteristic Test for Oxygen is
that it will relight a glowing splint
Manganese Dioxide is a catalyst.
A Catalyst is something that changes the speed of a reaction.
Manganese Dioxide speeds up the rate at which Hydrogen Peroxide breaks down into Water and Oxygen.
It does not get used in the reaction
OC25 investigate the ability of oxygen to support combustion in a wooden splint and a candle, and state two uses of oxygen
There is enough oxygen in 2kg of moon dust to keep a human alive for a day!
When a wooden splint that is glowing, if it is placed in a test tube of oxygen it will burst into flames.
OC26 burn carbon and magnesium in oxygen, and test the products using moist litmus paper
Carbon is the basis for most fuels. Burning Methane gas is similar to burning Carbon, Candles too could be considered to be Carbon.