What is the main difference between a physical change and a chemical change? Select all correct answers. Hint: 2 correct answers.
A. A physical change does not change the substances composition.
B. A physical change changes a one or more substance into a new substance.
C..A chemical change does not change the substances composition.
D. A chemical change changes a one or more substance into a new substance.

  the volume of  0.220 m k2s    solution  required  to  completely  react with 175 ml  of 0.115m co(no3)2  calculate the moles  of co(no3)2 =  molarity x volume/1000175 x0.115/1000= 0.02  moleswrite  the reacting  equationk2s(aq)  +  co(no3)2  = 2 kno3(aq)  + cos(s)by  use  of mole ratio between k2s to co(no3)2 which  is  1: 1 the moles of k2s is therefore = 175  x0.115/1000= 0.02  molesvolume = moles/molarity=0.02/0.22=0.09  ml  of k2s

H2so4 is the chemical compound of sulfuric acid. 

Why are people no giving enough information these days