have u done it
the first one is h2O2 -----> h2O + O2 (hydrogen peroxide into water and oxygen)
2nd talk about rate of reaction being highest initially, concentration of substrates is maximum, gradient is highest it can be, then substrate falls etc rate of reac decreases, concentration of substrate decreases etc
3rd u can't really measure the effect of catalase by using h2O2 as the substrate- idrk why though