Aqueous hydrogen peroxide, H2O2, decomposes slowly at 25 °C. 2H2O2(aq) → 2H2O(l) + O2(g) The decomposition reaction takes place faster when a catalyst is added. A student adds a small amount of catalyst to 10cm³ of 1.0mol/dm³ H2O2(aq) and collects the gas formed. The volume of gas collected is 90 cm³. All measurements are at room temperature and pressure. What is the percentage yield of O2(g)?

15.0 cm³ of 1.0mol/dm³ potassium hydroxide just neutralise 20.0 cm³ of a solution of nitric acid. What is the concent…

The equation for the burning of hydrogen in oxygen is shown. 2H2(g) + O2(g) → 2H2O(g) What does this equation indicate?

For which molecules are the empirical and molecular formulae the same? 1. methanoic acid, HCO2H 2. ethanoic acid, CH3…

Which molecule has the largest number of electrons involved in covalent bonds?

In which of the following is there a lattice of positive ions in a 'sea of electrons'?

Which statement about both chlorine atoms and chloride ions is correct?