13532465
Descrição
FlashCards por Alvaro Vargas Calero, atualizado more than 1 year ago
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Criado por Alvaro Vargas Calero
aproximadamente 6 anos atrás
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| Questão | Responda |
| Temperature effects | Increasing the temperature of a system increases the average kinetic energy of its constituent particles. As the average kinetic energy increases, the particles move faster and collide more frequently per unit time and possess greater energy when they collide. Both of these factors increase the reaction rate. Hence the reaction rate of virtually all reactions increases with increasing temperature. |
| To see: https://goo.gl/RH47KQ | |
| Conversely, the reaction rate of virtually all reactions decreases with decreasing temperature. For example, refrigeration retards the rate of growth of bacteria in foods by decreasing the reaction rates of biochemical reactions that enable bacteria to reproduce. | |
| In systems where more than one reaction is possible, the same reactants can produce different products under different reaction conditions. For example, in the presence of dilute sulfuric acid and at temperatures around 100°C, ethanol is converted to diethyl ether: |
Image:
Rx1 (binary/octet-stream)
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| At 180°C, however, a completely different reaction occurs, which produces ethylene as the major product: |
Image:
Rx2 (binary/octet-stream)
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