This worksheet provides 40 practice problems over balancing equations. They range in difficulty from simple (already balanced) to very challenging.
I have the worksheet set up so MOST of the challenging ones are on the second page. I have my students work on the first page with a partner in class, then finish for homework, and leave the second page as extra credit, for those who are grasping the concept, and want to challenge themselves.
To save space, I have students do their scratch work on notebook paper, and staple it to their worksheet (which shows the problems, and students answers only)
The worksheet includes an answer key.
I have also included a 9-question quiz, with space for scratch work. The quiz is over some of the easier problems, as the goal (in my mind) is to see if they understand the process, not how to reason through the math involved in some of the tougher problems. Number 9 is a tougher problem, as it contains multiple instances of Hydrogen on the reactant side, as well as a polyatomic ion that shows up on both sides.
The quiz also includes an answer key.