Factors that affect the rate of chemical reactions include exposed surface area, temperature, reactant concentration, and the presence of catalysts or inhibitors. Describe how each of these, individually, affects the ability of substances to take part in chemical reactions.
Exposed surface area-A powdered solid will normally
produce a faster reaction than if the same mass is present as a single
lump. The powdered solid has a greater surface area than the single
Temperature-Increasing the temperature will increases reaction rates because of the disproportionately large increase in the number of high energy collisions. therefore speeding up the reaction.
Reactant concentration- a high concentration of the reactants will increase the molecules involved in the reaction therefore increasing the chemical reaction.
Presence of catalyst or inhibitors- A catalyst is a
substance which speeds up a reaction, but is chemically unchanged at the
end of the reaction. When the reaction has finished, you would have
exactly the same mass of catalyst as you had at the beginning. Therefore, the catalyst provides an alternative route for the reaction, that has a lower activation energy
May 27th, 2015
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