- Hydrogen reacts with ethyne, C, H,, to produce ethane, C, H, as shown below:
2H2(g) + C, H2(g) →→ C, H6(g)
Use the data in the following table to
write a rate law for this reaction.

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?