7/30/2019 Rates of Reactions Summary Sheet

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Rates of Reactions - Summary sheet

Chemical reactions are affected by:

Temperature - The higher the temperature the higher the rate of reaction. The particles are moving faster soare more likely to collide with the molecules/atoms they are meant to be reacting with. (Note that this is not

always the case with enzyme-catalysed reactions)

Surface area - The greater the surface area of a solid (or the smaller the size of the solid particles - powder is

faster than lumps) the faster the reaction. The reacting liquid can react with more of the solid.Concentration - The higher the concentration, the faster the reaction (the reacting particles are more likely to

come into contact with each other)

Catalysts These are substances which speed up a reaction without actually being used up themselves.

Mr Porter likes to compare this to a party.

Temperature - If the boys circulate faster at a party (hot particles) they are more likely to "react" with a girl.

The "wallflowers" are likely to be less successful!

Surface area - If the girls arrange themselves in a circle to dance (low surface area) as they do in England, it

is difficult for the boys to "react" with them also (it is easier for the boys if the girls are in smaller groups).

Concentration - If there are more boys (higher concentration), there are more likely to be more "reactions".

Catalyst Alcohol speeds the party (and thus the reactions) up! Or the catalyst could be friend who helps

get two people together.

Rates of Reactions - Summary sheet

Chemical reactions are affected by:

Temperature - The higher the temperature the higher the rate of reaction. The particles are moving faster so

are more likely to collide with the molecules/atoms they are meant to be reacting with. (Note that this is notalways the case with enzyme-catalysed reactions)

Surface area - The greater the surface area of a solid (or the smaller the size of the solid particles - powder is

faster than lumps) the faster the reaction. The reacting liquid can react with more of the solid.

Concentration - The higher the concentration, the faster the reaction (the reacting particles are more likely to

come into contact with each other)

Catalysts These are substances which speed up a reaction without actually being used up themselves.

Mr Porter likes to compare this to a party.

Temperature - If the boys circulate faster at a party (hot particles) they are more likely to "react" with a girl.

The "wallflowers" are likely to be less successful!

Surface area - If the girls arrange themselves in a circle to dance (low surface area) as they do in England, it

is difficult for the boys to "react" with them also (it is easier for the boys if the girls are in smaller groups).

Concentration - If there are more boys (higher concentration), there are more likely to be more "reactions".

Catalyst Alcohol speeds the party (and thus the reactions) up! Or the catalyst could be friend who helps

get two people together.

Sporter080