S4 - Rates of reactions
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What can differ in comparing reactions?
Different rates
Give an example of a slow reaction
Rusting of iron
Give an example of a moderate speed reaction
A metal, like magnesium, reacting with an acid to produce a gentle stream of bubbles
Give an example of a fast reaction
An explosion
What four things do rates of reaction depend on?
• Temperature - Concentration (or pressure for gases) - Catalyst - Size of particles (or surface area)
How can you increase the rate of a reaction?
• Increase temperature - Increase concentration - Add a catalyst - Crush solid reactants into smaller pieces (bigger sa)
On a typical graph for rates of reaction, what line would show the quickest reaction?
The line that becomes flat in the least time
What does the lowest gradient show?
The lowest reaction
What line show the fastest reaction?
B
What line shows a fast reaction with more reacants?
A
What lines shows the slowest reaction?
C