What part of the atom is involved in chemical reactions? protons neutrons nucleus electrons?

The diagram below shows a cell placed in a solution.a cell is shown placed inside a beaker. it is labeled cell. the solution inside the beaker is labeled 40% salt solution and the solution inside the cell is labeled 20% salt solution.only water is allowed to move in and out of the cell. what will most likely happen to the cell? it will expand as water moves out of it. it will shrink as water moves out of it.it will expand as water moves into it. it will shrink as water moves into it.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?