14035894
Descrição
FlashCards por I Shouldn't be awake, atualizado more than 1 year ago
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Criado por I Shouldn't be awake
aproximadamente 6 anos atrás
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| Questão | Responda |
| Step 1. | Using a measuring cylinder, measure out 150cm3 of H2O. Pour the water into the beaker. Record the initial temperature of the water to the nearest 0.5'c |
| Step 2. | Add methanol to the spirit burner. Weigh the spirit burner containing the methanol. |
| Step 3. | Place the spirit burner under the beaker, light the burner and burn the liqid fuel whilst stirring the water with the thermometer. |
| Step 4. | After about 3 minutes extinguish the flame and immediately record the maximum 'c reached by the water |
| Step 5. | Re-weigh the spirit burner containing the methanol. Assume that the wick has not been burnt. |
| Inaccuracies in experimental data (3) | Heat lost to surroundings other than water Incomplete combustion of methanol Evaporation of methanol from the wick |
| How to prevent evaporation from wick? | Weigh burner as soon as possible after flame extinguished use spirit burner cover |
| How to prevent heat loss? | Draught screen |
| Incomplete combustion? | Input O2 gas |
| What can you determine from this experiment? | Enthalpy change of a liquid fuel |
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