Oxygen And Oxides Flashcards
What is the composition of the air like?
Nitrogen - 78%
Oxygen - 21%
Argon - 1%
Carbon Dioxide - 0.04%
What experiment can be used to calculate the percentage of oxygen in air?
- Two syringes with a tube between them
- Copper is inside the tube
- The tube is heated
- Copper reacts with oxygen
- The change in volume of the air can be recorded by looking at how far the syringes have moved
What experiment can be used to get oxygen from the air in a laboratory?
- Thistle funnel inserted into conical flask
- Manganese oxide (catalyst) placed into flask and bung placed on top
- Delivery tube is connected to an up-turned test tube in water
- Hydrogen peroxide solution poured into thistle funnel
- Oxygen passed through the delivery tube to the test tube
How can carbon dioxide be prepared in a laboratory?
- Dilute hydrochloric acid reacts with calcium carbonate
- CO2 collects in an up-turned test tube in water
2HCl + CaCO3 -> CaCl2 + H2O + CO2
What are some uses of carbon dioxide?
- Fizzy drinks (more dissolves in water under pressure)
- Fire extinguishers (denser than air so it produces a ‘blanket’ over the fire)
- Dry ice (used in theatres for mist)
What happens in car engines, with regards to nitrogen and oxygen?
The temperature is so high that they can react to form nitrogen oxides.
What gases can cause acid rain?
- Nitrogen dioxide
* Sulphur dioxide
Describe the reaction of copper with oxygen.
The copper goes from bronze to black.
Describe the combustion of hydrogen.
Produces water as the only product.
How can you test for water?
Anhydrous copper sulphate turns from white to blue.
How can you check if water is pure?
It boils at 100C and freezes at 0C.
How do metal react with oxygen?
To form metal oxides (bases and sometimes alkalis).
