Ascorbic acid works because oxygen will react with it before it reacts with the polyphenol oxidase enzyme in the fruit. MATERIALS NEEDED FOR AN APPLE OXIDATION EXPERIMENT: 1) Cook the apples 2) reduce the exposure to oxygen or 3) reduce the pH of the fruit. When electrons are transferred between molecules, it’s a redox process. You can also see that as a fruit ripens, it turns brown when exposed to oxygen. Hypothesis: We believe that if we add Vitamin C to a fruit, it could slow down the oxidation of the fruit. You can do a taste test of ripe and unripe fruit to assay the sweetness of the fruit. We wanted to know what things will rust and why. Oxidation can be prevented or slowed down by not allowing oxygen to get to the surface of the fruit. Controlled experiment Materials: 3 plastic containers 1 apple Water Ascorbic acid (Vitamin C) 1. The amount of time it took for each variety of apple to turn brown. The oxidation process is also what causes metals to rust. What physiological changes accompany fruit ripening? This is because of oxidation that occurs on the surface of the fruit. To accomplish this, you can cook the food, which destroys the enzyme. Testing both salted and unsalted apple slices allowed us to prove this. These include water, lemon juice, a ... called oxidation. 2. You can reduce browning by slowing oxidation in three different ways. We did a rust oxidation experiment this week that was really fun to watch. My hypothesis was proven by my experiment results. This experiment involves dipping slices of apple in a variety of substances. Then we will see an apple turning brown. voltage drives a chemical reaction), called oxidation and reduction (redox) reactions. In the experiment outlined by Ms DNA (which is a good one; I would go with it), your independent variable would what substance you coated the fruit with, and will have three levels: Lemon Juice, vinegar, water (water being the control). All acids slow down the process of oxidation because of their low pH. Oxidation robs the fruit of flavor, color, and vitamins. In the first container put one piece of the apple 3. Fruit batteries use electrolytes (solution containing free ions, like salt water or lemon juice) to generate a voltage. We investigated whether lemon juice stops apples from turning brown in the experiment above. Also the apple in the lemon juice has an acid that reduces the pH of the apple and makes oxidation … Oxygen will first react with an acid and only when all acid has been depleted will it react with the apple enzymes. Plus we measured which ones rusted the quickest! Enzymes in the fruit (like polyphenol oxidase) make this process go faster. How to Do the Rust Oxidation Experiment: My kids gathered a bunch of different metal objects from around the house. Cut three little pieces of the apple. 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