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| Pregunta | Respuesta |
| How can we find out the rate of a chemical reaction? | Rate of reaction= Amount of reactant used or amount of product formed ____________________________ time |
| What affects the rate of a chemical reaction? | Temperature, surface area, concentration of solutions or pressure of gases and presence of a catalyst. |
| How does collision theory explain the effect of surface area on reaction rate? | The rate if chemical reaction increases if the surface area of any solid reactant is increased. This increases the frequency of collisions between reacting particles. |
| How does collision theory explain the effect of temperature on reaction rate? | Increasing the temperature increase the rate of reaction because the particles collide more frequently and more energetically. More of the collisions result in a reaction because a higher proportion of particles have energy greater than the activation energy. |
| How does increasing the concentration of a reactants in solutions affect the rate of reactions? | Increasing the concentration of reactants in solutions increases the frequency of collisions between particles, and so increase the rate of reaction. |
| How does increasing the pressure of reacting gases affect the rate of reactions? | Increasing the pressure of reacting gases also increases the frequency of collisions and so increases the rate of reaction. |
| What is a catalyst? | A substance that speeds up the rate of chemical reaction. |
| Why are catalyst used in so many industrial processes? | To increase the rate of reaction and reduce the energy costs. |
| Exothermic | Accompanied by the release of heat. |
| Endothermic | Accompanied by or requiring the absorption of heat. |
| How is energy involved in chemical reactions. | Energy may be transferred to or from the reacting substances in chemical reaction. |
| Uses of exothermic? | Hand warmer and self-heating cans. |
| Uses of endothermic? | Cold packs for sports injuries. |
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