| LEARN HERE ABOUT WHY APPLE TURNS TO BROWN WHEN CUT AND HOW TO PREVENT IT FROM GETTING BROWN. |
| YOU WILL NEED: AN APPLE, A KNIFE AND SOME DROPS OF LEMON . |
| CUT THE APPLE IN TO FOUR EQUAL PARTS. KEEP TWO PARTS COVERED BY LEMON JUICE IN THE CUT PORTION AND LEAVE THE OTHER TWO PARTS AS IT IS. THE PARTS COVERED BY LEMON JUICE IS NOT AFFECTED BY AIR AND HENCE IT WILL NOT BE BROWN WHEREAS THE OTHER TWO PARTS WILL BE BROWN. THE REASON WHY APPLE TURNS TO BROWN WHEN CUT IS THAT THE IRON IN APPLE TURNS FROM FERROUS STAGE TO FERRIC STAGE WHEN EXPOSED TO AIR. |
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