C3 - Rate of Reaction 0.0 / 5 ? ScienceRate of ReactionGCSEOCR Created by: kaliSereneCreated on: 04-05-16 13:58 What does rate of reaction mean? Measuring how much product is formed in a fixed period of time 1 of 22 What is a reactant? a substance that takes part in and undergoes change during a reaction 2 of 22 What is a product? A chemical substance formed as a result of a chemical reaction 3 of 22 How can the rate of reaction be worked out? The gradient 4 of 22 What is a limiting reactant? The reactant that is not used in excess that gets used up by the end of the reaction 5 of 22 Reactions occur when.. particles collide together 6 of 22 What happens in terms of produce if the number of reacting particles is reduced? The number of collisions by particles of that reactant is limited 7 of 22 What does the rate of the reaction depend on? The number of collisions 8 of 22 What are three ways to increase rate of reaction? Concentration, temperature and pressure 9 of 22 What does concentration mean? The amount of particles in that same space. As the concentration increases, it means the particles become more crowded. 10 of 22 What does raising the temperature mean? The particles gain more kinetic energy and move around more quickly. 11 of 22 What does pressure mean? The particles are forced closer together 12 of 22 What does collision frequency mean? The number of successful collisions between reacting particles each second. 13 of 22 What does a particle need to have, for a successful collision to occur? Each particle must have enough energy to react 14 of 22 How does a higher concentration affect rate of reaction? The number of collisions per second increases as there are more particles likely to collide as there are more particles 15 of 22 How does a higher temperature affect rate of reaction? The reactants have more kinetic energy so collisions are more energetic and frequent, so more likely to be successful 16 of 22 How does an increase in pressure affect rate of reaction? Forces particles closer together so increases collision frequency 17 of 22 What are explosions caused by? Combustible powders 18 of 22 What has the biggest surface area - Block or powder? POWDER! 19 of 22 When do reactions occur? Reactant particles collide with sufficient energy 20 of 22 Why do powders speed up rate of reaction? Because they can spread through the mixture, increasing collision frequency 21 of 22 Why can collisions only occur with particles on the surface? The particles of the block are trapped inside, so they are not available to react 22 of 22
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