Fractional distillation of air

1. Fractional distillation of air Can you carefully read through the sheet. Then condense it to 4 sentences of no more than 12 words a sentence. Can you finish this please?

2. Last lesson • Uses of carbon dioxide • Oxides of nitrogen • Fractional distillation of air

3. Uses of carbon dioxide Fizzy drinks. The higher the pressure, the more soluble the gas becomes. So what happens when the pressure is released?

4. Uses of carbon dioxide Dry ice (actually it’s condensed water vapour that you can see.)

5. Uses of carbon dioxide Fire extinguishers

6. Oxides of nitrogen Nitrogen is generally an unreactive gas, and needs fairly extreme conditions to get it to react with oxygen

7. Nitric oxide, NO Lightning brings about the direct union of nitrogen and oxygen in the air to produce small amounts of nitric oxide, as does the high temperatures produced in car engines.

8. Nitric oxide, NO It is a toxic air pollutant, often linked with asthma and allergic responses

9. Nitrous oxide, N2O Formed when ammonium nitrate, NH4NO3, is heated. A colourless gas with a pleasing odour and sweet taste, is used as an anesthetic for minor operations, especially in dentistry.

10. Nitrous oxide, N2O It is called laughing gas because of its intoxicating effect. It is alsowidely used as a propellant in aerosol cans of whipped cream!

11. Nitrogen dioxide, NO2 In the presence of excess oxygen, nitric oxide, NO, will be converted to nitrogen dioxide,NO2. Nitrogen Dioxide is a reddish brown, toxicgas at room temperature. NO2 condenses to a brown liquid, but freezes to a colourless solid.

12. Nitrogen dioxide, NO2 Nitrogen Dioxidehas been used as a catalyst in certain oxidation reactions; as a nitrating agent for organic compounds; as an oxidizing agent; as a rocket fuel; and as a flour bleaching agent

13. Today’s lesson • The allotropes of sulphur

14. Stick it in! Can you stick the sheet in and read the instructions?

15. Question Can you answer the question please?