Chemistry
B.2 Identify independent and dependent variables
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Bob's daughter complained that the apple slices in her lunchbox turned brown by lunchtime. Bob read that when apple slices are exposed to air, oxygen in the air reacts with the cut surface of the apple slices, turning them brown. Bob's favorite cooking website said that pouring lemon juice on the apple slices would slow down this chemical reaction.
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Bob cut an apple into ten slices. He put five of the slices into a bowl and poured two tablespoons of lemon juice over them. He put the other five slices into another bowl and did not add any lemon juice to them. After one hour, Bob counted the number of apple slices in each bowl that had turned brown.
Which of the following was an independent variable in this experiment?
apples that turned brown
Amount of lemon juice
Asked by
Teanna3
Last updated by
Jill W
