Do now! Can you read through the notes we made last lesson?

Last lesson Reactions of sulphur dioxide in water and with alkalis Laboratory production of carbon dioxide Reactions of carbon dioxide in water and with alkalis

Sulphur dioxide SO 2 Produced by burning sulphur (or burning fossil fuels) S (l) + O 2(g) SO 2(g)

In water Dissolves to form sulphurous acid SO 2(g) + H 2 O (l) H 2 SO 3(aq)

With an alkali Forms a sulphite SO 2 + 2NaOHNa 2 SO 3 + H 2 O

Carbon dioxide

Preparing carbon dioxide Acid + carbonate salt + water + carbon dioxide 2HCl + CaCO 3 CaCl 2 + H 2 O + CO 2

In water Dissolves to form carbonic acid CO 2(g) + H 2 O (l) H 2 CO 3(aq) pH 5.5

In alkali H 2 CO 3(aq) + 2NaOH (aq) Na 2 CO 3(aq) + 2H 2 O (l) acid + basesalt + water

Today’s lesson Uses of carbon dioxide Oxides of nitrogen

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

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

Uses of carbon dioxide Fire extinguishers How does it work?

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

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.

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

Nitrous oxide, N 2 O Formed when ammonium nitrate, NH 4 NO 3, is heated. A colourless gas with a pleasing odour and sweet taste, is used as an anesthetic for minor operations, especially in dentistry.

Nitrous oxide, N 2 O It is called laughing gas because of its intoxicating effect. It is also widely used as a propellant in aerosol cans of whipped cream!

Nitrogen dioxide, NO 2 In the presence of excess oxygen, nitric oxide, NO, will be converted to nitrogen dioxide,NO 2. Nitrogen Dioxide is a reddish brown, toxic gas at room temperature. NO 2 condenses to a brown liquid, but freezes to a colourless solid.

Nitrogen dioxide, NO 2 Nitrogen Dioxide has 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

Stick them in Can you stick the slides in your books?

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.