that as concentration of y decreases so does reaction rate. This could be true for x. The same theory applies with HCL acid and Thiosulphate, so as thiosulphate concentration increases so will reaction rate. I believe that if you plotted percentage of thiosulphate against rate of reaction you would get a straight line, which also means that I predict that they are directionally proportional to each other.
             Percentage of thiosulphate reaction rate * k (k being constant such as the input variables).
             As you can see only 2 molecules can react with 2 HCL molecules. But if there was less water this happen:
             Now 4 molecules of Mg. The reaction would be quicker than the above because:
             What happens is that water molecules tend to get in the way of collisions, so if there are more water molecules in between two chemicals those two chemicals can't really get to each other, so really water tends to "clog up" t
             ...