C3 Chemical economics [1] 0.0 / 5 ? ChemistryRate of reactionGCSEOCR Created by: GraceLongCreated on: 02-02-16 19:37 What does the rate of reaction measure? How much product is formed in a fixed amount of time. 1 of 11 Which two units can be used to measure the rate of reaction? g/s (grams per second) cm3/s (centimeters cubed per second) 2 of 11 What is the relationship between the limiting reactants and the amount of product? Directly proportional eg. both double. 3 of 11 What has to happen before particles react? They have to collide and gain energy. 4 of 11 Why does increasing the temperature increase the rate of reaction? The particles have more energy and begin to move quicker which increases the chance of a successful collision. The rate of reaction also increases. 5 of 11 How is the collision frequency described? The number of successful collisions between reacting particles each second. 6 of 11 How can graphs be used to show when the reaction has finished? The line stops increasing and goes horizontal. 7 of 11 Why must owners of factories of powders be careful? Powders have a very large surface area and if they reach the atmosphere or a spark they will combust. 8 of 11 How does surface area increase the rate of reaction? Particles are more spread out and have a larger amount of particles for a chance of a successful collision. 9 of 11 How can the relative atomic mass be found? (Hint: think periodic table) The atomic mass is the largest number for the element on the peroidic table. 10 of 11 What is the conservation of mass? The reactants mass will always equal the reactants because mass cannot be lost or gained. 11 of 11
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