1. The problem statement, all variables and given/known data The apparatus below shows an experiment to investigate the speed of reaction between lithium and water. A piece of lithium is wrapped in steel gauze and placed in a beaker of ]water. The volume of gas collected in the measuring cylinder is measured at 10s time interval. Suggest two possible reasons why the shape of the graph from Student Y's results differ from that of the graph of Student X's results.(assume that both students recorded their results correctly) 2. Relevant equations 3. The attempt at a solution Student Y could have added more lithium pieces as the reaction proceeds for the first 37s as the gradient is increasing which signifies speed of reaction increasing and concentration of reactants increasing. He could also have used water of lower temperature as gradient of the graph is still decreasing at 50s which means reaction has not stopped. I am quite confident with my first reason but not so with my 2nd where it suggest water of lower temperature. Please do enlighten me. Thank you!