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Junior third chemical experiment report

Experimental procedure: 5 mL of 5% hydrogen peroxide solution was added to the test tube, and the wood strip with Mars was inserted into the test tube;
Heating the test tube and inserting the strip with Mars into the test tube;
Add 5 mL of 5% hydrogen peroxide solution to another tube and add 2 g of manganese dioxide to insert the wood strip with Mars into the test tube;
When there is no more phenomenon in the test tube, the 3 mL 5% hydrogen peroxide solution is reheated, and the wood strip with Mars is inserted into the test tube;
After the experiment, manganese dioxide was recovered, dried, and weighed.

Physical experiment report·Chemical experiment report·Biological experiment report·Experiment report format·Experiment report template Experimental phenomenon and phenomenon explanation:
Experimental number experimental phenomenon phenomenon explained wood strip does not re-ignite wood strip does not re-ignite H2O2 decomposition O2 speed is too slow not enough O2 test wood re-ignition.
3H2O2 produces a large number of bubble wood re-ignition MnO2 to accelerate the decomposition of H2O2 by O2, O2 makes the new addition of H2O2 to produce a large number of bubbles because MnO2 continues to act as catalytic extrusion! H2O2 continues to decompose
The mass of 5MnO2 is constant. Because MnO2 is a catalyst, it only changes the chemical reaction rate without changing its chemical properties and quality.

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