Which of the following equations is correct to solve for the oxidation number of I in Cs +1 I O2-4 A. 1(+1) + X + [4(-2)] = 0 C. 1(+1) + X + [4(-2)] = -2
B. 2(+1) + X + [4(-2)] = 0 D. 1(+1) + 2X + [4(-2)] = 0

Ithink d hope that

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.