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| Pregunta | Respuesta |
| Rate of reaction increases using a catalyst because... | a catalyst lowers the activation energy meaning less energy is needed to start a reaction |
| Rate of reaction increases when temperature is increased because... | more energy is supplied to the particles meaning they move faster, meaning there is more chance of collisions |
| Rate of reaction increases when pressure increases because... | particles are pushed closer together so there is more chance of collisions |
| Rate of reaction increases when surface area is increased because... | more surface is exposed so there is more area for a reaction to happen on |
| Rate of reaction increases when concentration increases because... | there are more particles in a fixed space meaning particles are more likely to collide |
| Rate of reaction equation | Rate of reaction= amount of product produced ÷ time taken |
| Rate of reaction is | the time taken for a product to form, or reactants to be used up |
| Activation energy is | the minimum amount of energy needed for a reaction to start |
| On a rate of reaction graph, the larger the gradient... | the faster the rate of reaction is |
| On a rate of reaction graph, we know a reaction is finished when... | the line levels off/ no more product is being produced over a certain time |
| On a rate of reaction graph, when we use tangents, we calculate the rate with the equation.. | rate of reaction using a tangent = change in y ÷ change in x |
| A reversible reaction is... | a reaction where the products of a reaction can react to produce the original reactants |
| What is equilibrium? | The stage in a reversible reaction where the rate of the forward reaction is equal to the rate of the backward reaction |
| What is Le Chatelier's Principle? | When conditions are changed, the reaction will do everything it can to counteract the change (e.g. when temperature increases, the reaction will favour the endothermic reaction so the temp decreases) |
| Exothermic= | temperature is given out so atmosphere heats up but internal cools down |
| Endothermic= | temperature is taken in, so atmosphere cools down but internal heats up |
| When pressure increases, which side will it favour? | The side with fewer moles |
| When pressure decreases, which side will the reaction favour? | The side with more moles |
| When concentration increases, which side will the reaction favour? | The side with more molecules/moles as it is trying to use it up, so more product is created |
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