Predict the product:

hydrogen peroxide (catalyzed by manganese dioxide)

H2O2 is an unstable substance that decomposes gradually into water and ...?

H2O and O2.

To predict the product of a reaction involving hydrogen peroxide (H2O2) catalyzed by manganese dioxide (MnO2), we need to consider both the reactants and the catalytic role of manganese dioxide.

Hydrogen peroxide, H2O2, is a compound that readily decomposes into water (H2O) and oxygen gas (O2). This decomposition process is slow in the absence of a catalyst, but it is significantly accelerated in the presence of certain catalysts, such as manganese dioxide (MnO2).

The catalytic action of MnO2 occurs through its ability to release oxygen atoms into the reaction mixture from its crystal lattice structure. These released oxygen atoms then react with the hydrogen peroxide to form water and oxygen gas, resulting in the decomposition of hydrogen peroxide.

Therefore, the predicted product of the reaction between hydrogen peroxide and manganese dioxide catalysis is water (H2O) and oxygen gas (O2).