Students can determine the rate of a reaction using either the ‘disappearing cross’ method or the ‘loss of mass’ method. In the ‘disappearing cross’ method, the student records how long the reaction mixture takes to turn cloudy. In the ‘loss of mass’ method, the student measures how much mass is lost in a given time interval. The rates of two reactions are being studied. Reaction 1: Warm aqueous silver nitrate is added to chlorobutane dissolved in ethanol. Two products are produced. One product is an organic compound that dissolves in ethanol and the other is silver chloride, which does not dissolve in ethanol. Reaction 2: Small pieces of solid calcium carbonate are added to dilute hydrochloric acid. Which method should be chosen for each reaction?
- Areaction 1: disappearing cross; reaction 2: disappearing cross
- Breaction 1: disappearing cross; reaction 2: loss of mass
- Creaction 1: loss of mass; reaction 2: disappearing cross
- Dreaction 1: loss of mass; reaction 2: loss of mass