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| Pregunta | Respuesta |
| Name the elements in air + their percentage | - Nitrogen 78% -Oxygen 21% -Argon 21% -Co2 0.035 -Water Vapour 0-4% |
| How is Oxygen made? | Breakdown of hydrogen peroxide (H2O2) in the presence of manganese dioxide (MnO2) |
| What is used to test for Co2? | Limewater ; it turns it milky |
| How is Carbon Dioxide made? | Dilute hydraulic acid (HCl) and marble chips (CaCo3) |
| What colour does water turn blue cobalt chloride paper? | Pink |
| Is air a mixture or a compound? | Air is a mixture: It consists of 5 different molecules. Its composition can vary. The different gases condenses as liquids in different temperatures |
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