109 C H A P T E R 6 R E V I E W A N D A S S E S S 14. How does the age of an egg affect its pH level? 15. How do acids affect the quality of fruit? Critical Thinking 16. Your grandmother suggests you add a pinch of baking soda to broccoli during cooking to keep it bright green. What can you tell her about this tip? 17. You have discovered that one of your friends has started purging to help lose weight faster. How would you explain to your friend the dangers of pH as related to bulimia? 18. What is the advantage of taking a buffered aspirin? 19. Placing an open box of baking soda in a refrigerator helps neutralize odors from foods. What does this tell you about the pH of the volatile substances that cause food odors? 20. How would overmixing a batter or dough containing baking powder affect the quality of the baked product? Core Skills 21. Research, Writing. Using multiple print and digital sources, research the impact of acid rain in your area. Write an article for your school newspaper on the results, citing the sources that you used and the strengths and weaknesses of each. 22. Research, Presentation. Research the use of vinegar and baking soda as cleaners. Is there a relationship to their use and the pH of the material being cleaned? Can you draw general conclusions about when to use vinegar, and when baking soda would be better? Share your findings with the class. 23. Research. Determine what the difference in pH is, if any, of rainwater in your area after a rain shower versus a thunderstorm. 24. Research, Presentation. Create a diagram that illustrates the pH changes throughout the digestion system of the human body. STEM Connections 25. Science. Measure the pH of a dozen eggs from the date of purchase, testing one per day. Chart the pH readings over 12 days. Observe the appearance of the egg. Report the results and summarize your recommendations. 26. Technology. Create a pamphlet or bulletin board that demonstrates the recommendations of salt intake in the current Dietary Guidelines for Americans. 27. Engineering. Research the impact of pH levels on materials typically used by engineers in food production lines. 28. Math. Measure the pH of at least seven of your favorite beverages. Create a bar graph that compares the pH of the beverages. 29. Math. What is the mass of cream of tartar needed to make a single-acting baking powder from 10 g baking soda? Copyright Goodheart-Willcox Co., Inc.