Science Fair Project  Why Does an apple slice turn brown  with different things ?
362434
I believe it has to do with oxidation.  The minute you slice an apple open you are exposing it to oxygen, which breaks down the molecules of the apple. I also believe it has something to do with the sugar content.  I know when I cook with apples, the recipe books state that if you rub lemon juice on apples it will stop the browning process. Lemons contain vitamin C, which is an acid. What other liquids contain acid?  Think of the content of soda, and water.  Do they contain an acid like lemons or oranges?\n\nI hope this helps.  Try running a search on yahoo with the following search string "apples oxidation"
890781
Apple's a fruit so it contains many sugars,other carbohydrates,minerals,etc.The oxygen in the atmosphere reacts and oxidizes these and so the change in colour.This was for cut surface of course.But for the skin its the pigment which impart the colour at maturity.
131556
I hope this helps:\n\nhttp://pslc.ws/macrog/kidsmac/molding.htm
652300
When light falls on an apple, all colors are absorbed except for red, which is reflected and picked up by our eyes.  This makes the apple appear red.
321166
b cus the old apple is too old so had no juice anymore
741861
Hypothesis - The saliva in a person's mouth will convert starch to sugar.\nExperiment - Chew an unsalted soda cracker in your mouth.  Do not swallow for 10 minutes.  Record changes of flavor and sweetness.\n\nYou will observe that it becomes sweeter.\n\nAnother experiment is to apply iodine to various mixtures.  Add iodine to salt, flour, & potato.  When added to salt, it stays the color of iodine.  But added to flour or potato, the iodine turns a blue-black because it reacts with the starch.
469553
It is because secreted into the bowel are two substances which colour it - Bilirubin which is redish, and biliverdin which is greenish. Put them together and you get brown.
600507
Chop it off!  Why did you put vinegar onto a brown spot anyways!!  Put baking powder onto it if you want to reverse the effect of the vinegar.
313248
apply sugar to the cut side of the apple.it stays without becoming brown
178403
Potatoes like apples experience oxidization rapidly hence the rapid browning. Placing them in water slows down this process as they are less in contact with oxygen which triggers the process.
717693
idk my science teacher had us do the ice cream experiement but she was kinda a bad teacher and she never really explained why we did it. she gave us a worksheet asking questions on it but i had no idea what the answers were. also severaL people in my class threw up so im pretty sure we did it wrong. sorry
780979
enzymes react with the air to make the brown color.
612140
This question has been asked numerous times.  Theses are User estee06's words.  I put a link below.\n \n\nApples and other produce (e.g., pears, bananas, peaches, potatoes) contain an enzyme (called polyphenol oxidase or tyrosinase) that reacts with oxygen and iron-containing phenols that are also found in the apple. The oxidation reaction basically forms a sort of rust on the surface of the fruit. \n\nYou see the browning when the fruit is cut or bruised because these actions damage the cells in the fruit, allowing oxygen in the air to react with the enzyme and other chemicals
631362
It's the die in the soda mixed with what is normally brown stool.  It's weird, but you can get the same result with mixing water colors together.
495706
The oxygen in the air causes apples and bananas to turn brown when they have been exposed to the air too long. Try submerging them in orange, lemon, or grapefruit juice soon after you cut them. This will help to keep their color.
442945
Osmosis in potatoes. \nPut pieces of potato in different conc. of glucose solution and look at the changes.
729596
I am not really sure why but the guys on Myth Busters did this experiment on their show on the Discovery Channel. There is a little blurb here: http://dsc.discovery.com/fansites/mythbusters/episode/episode_02.html\nand more info on the experiment here:\nhttp://www.eepybird.com/science1.html\nhope that helps with your science fair project! good luck!