Investigating the Rate of Reaction Between Marble Chips
             And HCL
            
            
             Safety- must always wear safety glasses and we should be very
             careful not to drop any acid.
            
            
             Fair test- we must make sure that we use the same size, amount and
             roughly the same mass of chips, this is because we want to keep the chips
             roughly the same all the way through the experiment so that it will be a
             fair test and the results we be in relation to each other, otherwise the
             results will be completely different to what we will expect and it will
             ruin the experiment. We must also take our readings at the same intervals
             throughout the experiment i.e I will take a reading every fifteen seconds
             for all of my experiments.
             I predict that the more concentrated the acid the quicker the
             reaction will take place, because the more concentrated the acid is then
             it will make the chips react faster and more hydrogen will be given off in
             a quicker time. The
             smaller the stones are, the even quicker the reaction will happen, this is
             because the acid has a smaller surface area to act upon.
            
            
             Equipment- We will need a boiling tube, calcium carbonate chips, hydrochloric
             acid,
             water, a stop watch, a gas syringe and a bung on the top of the boiling
             tube with a delivery tube connected to the gas syringe. I will also need a stand
             and a clamp to hold...