I have just finished my ISA and have it all written out in my book not actually on the paper yet but i want to make sure i got all my answers right could you help 
Thanks
When magnesium ribbon reacts with dilute HCl it will turn into MgCl. Measure the time it takes for the Mg to fully react (dissolve).
1) What are two control variables
2) How could we improve the precision
3) State one possible cause of random errors
4) State one systematic error in our investigation
5) Balanced symbolic equation.
6) How could you calculate the rate of the reaction between calcium carbonate and sulphuric acid from the volume of gas produced?
7) John tested calcium carbonate with the sulphuric acid. He claimed that all acids would give the same results. Do you think that John was justified in his claims? Explain.
ThanksWhen magnesium ribbon reacts with dilute HCl it will turn into MgCl. Measure the time it takes for the Mg to fully react (dissolve).
1) What are two control variables
2) How could we improve the precision
3) State one possible cause of random errors
4) State one systematic error in our investigation
5) Balanced symbolic equation.
6) How could you calculate the rate of the reaction between calcium carbonate and sulphuric acid from the volume of gas produced?
7) John tested calcium carbonate with the sulphuric acid. He claimed that all acids would give the same results. Do you think that John was justified in his claims? Explain.