There are several factors that can cause stress or disturbances in chemical reactions. These can include changes in temperature, pressure, concentration, and the presence of impurities or catalysts. Other factors that can affect the rate or outcome of a chemical reaction include the surface area of the reactants, the presence of light or radiation, and the presence of electric or magnetic fields. Additionally, the type of solvent used can also influence the reaction. In general, any factor that affects the balance of the reactants and products in a chemical reaction can cause stress or disturbance.