Chapter 11 has a lot of math. The more you practice, the better you'll get.
More practice problems can be found at the chem team site. This site includes a series of tutorials, problems, and answer keys for immediate feedback!
Your notebook might include the following type of reflections:
--What are some other areas of your life where you might need to solve problems involving measurements (examples, in cooking, in carpentry, etc). Show how dimensional analysis might be used to solve a typical problem in one of these fields.
--Choose supplementary problems from the chem team website, or from the back of the chapter, and show how they should be solved.
--Draw a graphic, like one of those shown in figure 11-9, 11-11, or 11-13, then personalize it to help you solving stoichiometry problems. What types of ratios, or equations, are used at each step of the problem solving?
--(chapter 11.3) Explain how "limiting reactant" problems apply to planning the food for a complex recipe (a cake, or cookies, or any recipe of your choosing). Show how you would plan to purchase the ingredients for the recipe you choose, while minimizing the amount of surplus (left over) ingredients.