Aqueous solutions of hydrogen peroxide sold in pharmacies are usually approximately 3% H2O2 by mass. However, in solution, hydrogen peroxide decomposes into water and oxygen. What is the percent by mass of a solution of hydrogen peroxide, H2O2, prepared from 2.104 g of H2O2 which is titrated with 51.78 cm3 of 0.03245 mol dm-3 KMnO4(aq). The reaction occurs in an acidified solution

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the dependent variable in this experiment? the mirror used to reflect the light the ray box used as the source of light angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box