GCSE Chemistry Specification

OCR B J258

Section C6.2: How do chemists control the rate of reactions?

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#C6.2.1

describe the effect on rate of reaction of changes in temperature, concentration, pressure, and surface area

#C6.2.2

explain the effects on rates of reaction of changes in temperature, concentration and pressure in terms of frequency and energy of collision between particles

#C6.2.3

explain the effects on rates of reaction of changes in the size of the pieces of a reacting solid in terms of surface area to volume ratio

#C6.2.4

describe the characteristics of catalysts and their effect on rates of reaction

#C6.2.5

identify catalysts in reactions

#C6.2.6

explain catalytic action in terms of activation energy

#C6.2.7

suggest practical methods for determining the rate of a given reaction including:
PAG8

for reactions that produce gases:
i. gas syringes or collection over water can be used to measure the volume of gas produced
ii. mass change can be followed using a balance

measurement of physical factors:
iii. colour change
iv. formation of a precipitate

#C6.2.8

interpret rate of reaction graphs

#C6.2.9

interpret graphs of reaction conditions versus rate

an understanding of orders of reaction is not required

#C6.2.10

use arithmetic computation and ratios when measuring rates of reaction

#C6.2.11

draw and interpret appropriate graphs from data to determine rate of reaction

#C6.2.12

determine gradients of graphs as a measure of rate of change to determine rate

#C6.2.13

use proportionality when comparing factors affecting rate of reaction

#C6.2.14

describe the use of enzymes as catalysts in biological systems and some industrial processes