Draw the dot-and-cross diagram to show the electron arrangement in a hydrogen peroxide molecule. Include only the outer-shell electrons of oxygen and hydrogen.
A 0.170 g sample of hydrogen peroxide is provided. Calculate the number of molecules of hydrogen peroxide in the sample. One mole of hydrogen peroxide contains $6.02\times10^{23}$ molecules.
Calculate the total number of atoms in this hydrogen peroxide sample.
When aqueous hydrogen peroxide reacts with acidified aqueous potassium manganate(VII), the colour changes from purple to colourless. When aqueous hydrogen peroxide reacts with aqueous potassium iodide, the colour changes from colourless to brown. Explain what these observations show about the chemical properties of aqueous hydrogen peroxide.
Barium peroxide reacts with cold dilute sulfuric acid to produce hydrogen peroxide. Barium peroxide contains only the ions $Ba^{2+}$ and $O_2^{2-}$. Deduce the formula of barium peroxide.
The equation for the decomposition of aqueous hydrogen peroxide is $2H_2O_2(aq)\rightarrow2H_2O(l)+O_2(g)$. The rate of decomposition rises as the temperature of the aqueous hydrogen peroxide increases. Explain why.
Manganese(IV) oxide is a catalyst for the decomposition of aqueous hydrogen peroxide. Describe how a catalyst increases the rate of reaction.