5405379
Descripción
Fichas por Anisha Rai, actualizado hace más de 1 año
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Creado por Anisha Rai
hace más de 8 años
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| Pregunta | Respuesta |
| What is air? | A mixture of gases with different boiling points |
| What is the percentage of oxygen in the air? | 21% |
| What is the percentage of nitrogen in the air? | 78% |
| Are there relatively small of relatively large amounts of water vapour, carbon dioxide, neon and argon in the air? | Relatively small |
| What is dry air? | Air free from carbon dioxide |
| How can dry air be used to obtain oxygen and nitrogen? | It can be liquefied and then fractionally distilled |
| What can elements burn in air to form? | Oxides which can be classified as acidic, basic and amphoteric |
| What do water-soluble oxides of metals give? | Alkaline solutions |
| What do water-soluble oxides of non-metals give? | Acidic solution |
| What are substances reacting with when they burn in air? | Oxygen |
| Describe the test for oxygen | A glowing wooden splint relights in a test tube of oxygen |
| What do oxidation and reduction reacts involve? | The addition and removal of oxygen respectively |
| What is air polluted by? | Carbon monoxide Sulphur dioxide Oxides of nitrogen |
| How does carbon monoxide arise? | The incomplete combustion of carbon-containing fuels |
| What is the effect of carbon monoxide? | It is poisonous |
| How does sulfur dioxide arise? | Sulfur dioxide is produced when fuels that contain sulfur compounds burn |
| What is the effect of sulfur dioxide? | Acid rain which erodes statues etc |
| How do oxides of nitrogen arise? | Formed from the heat and pressure found in a car engine |
| What is the effect of oxides of nitrogen? | Acid rain |
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