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level: Rates of Reaction

Questions and Answers List

Question	Answer
What factors affect the rate of reaction?	concentration, temperature, particle size, catalyst
What is a catalyst?	substance that speeds up chemical reaction but can be recovered chemically unchanged at the end of reaction
what must happen to reactant particles for a reaction to occur?	they must collide
what effect does temperature have on rate of reaction?	higher the temperature, faster the reaction
what effect does concentration have on rate of reaction?	higher the concentration, faster the reaction
what is concentration	a measure of number of particles of solute
what is the unit of concentration	mol l⁻¹
what effect does particle size have on rate of reaction?	smaller the particle size, faster the reaction
what is the formula for average reaction rate	average reaction rate = Δquantity/Δtime
in the formula 'average reaction rate = Δquantity/Δtime' what may quantity be?	concentration, mass, volume
give 3 examples of units of rate	mol l⁻¹ min⁻¹, cm³ s⁻¹, g hr⁻¹
how do you know which unit of rate to use?	depends on the unit of quantity and unit of time
what would be the unit of rate if told the quantity 6g and the time 7s?	g s⁻¹