Laboratory Activity 1.2.4: The Effect of a Catalyst on the Rate of Reaction |
Problem statement: How does the presence of a catalyst influence the rate of reaction?
Hypothesis: If positive catalyst used in the reaction, the rate of reaction will occur faster.
Variable:
» | Fixed variable : Temperature and volume of reactants | |
» | Manipulated variable : Presence of catalyst | |
» | Responding variable : Rate of reaction |
Material: » Hydrogen peroxide 20-volume » Manganese (IV) oxide powder |
Apparatus: » Burette » Conical flask » Measurement cylinder » Stopwatch » Retort stand with clamp » Basin » Delivery tube |
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► | Hydrogen peroxide decomposes slowly at room temperature.
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► | The presence of manganese (IV) oxide which acts as a positive catalyst increases the rate of oxygen gas, which increases the rate of reaction. | |||
► | Manganese dioxide is a catalyst. It is not used up in the reaction. Its mass is unchanged at the end of the reaction. |
► | The presence of a positive catalyst can increase the rate of a reaction. |
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