PPT Slide

Chemical Reactions That Occur in a Sequence

A product of one reaction can become a reactant of the next (reaction sequence).

If a substance forms in one reaction and is used up in the next, write an overall equation that eliminates the substance altogether.

Skill 3-8: Roasting chalcocite is the 1st step in extracting copper.

Next step: copper(I) oxide reacts with powdered carbon to yield copper metal and carbon monoxide gas:

(a) Write a balanced overall equation for the two-step sequence.

Add the equations together. Only Cu 2O appears as a product in one equation and a reactant in the other, so it is the common substance.