Question

emmetts daughter complained that the apple slices in her lunchbox turned brown by lunchtime. emmett 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. emmetts favorite cooking website said that pouring lemon juice on the apple slices would slow down this chemical reaction. emmett 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, emmett counted the number of apple slices in each bowl that had turned brown. which of the following was a dependent variable in this experiment? the number of apple slices that turned brown the amount of lemon juice added to the apple slices

Explanation:

In an experiment, the dependent variable is what is measured. Here, it's the number of apple - slices that turned brown as it depends on the lemon - juice addition.

Answer:

the number of apple slices that turned brown