Which reaction has the largest positive value of δs? . a. co2(g) + 3h2(g) → ch3oh(g) + h2o(g). b.2al(s) + 3s(s) → al2s3(s). c. ch4(g) + h2o(g) → 3h2(g) + co(g). d.2s(s) + 3o2(g) → 2so3(g).

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?