Look at the four chemical reactions. Reaction 1: 4Na + O2 → 2Na2O
Reaction 2: 2NaCl → 2Na + Cl2
Reaction 3: CaCO3 → CaO + CO2
Reaction 4: 2KClO33 → 2KCl + 3O2

Which statement identifies the reaction that is different from the rest and explains correctly why it is different?

Reaction 2, because two ions are interchanged
Reaction 2, because two products are formed
Reaction 1, because a single product is formed
Reaction 1, because a single ion is replaced in a compound

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml