The potential difference across the terminals of a battery is 8.40 V when there is a current of 1.50 A in the battery
from the negative to the positive terminal. When the
current is 3.50 A in the reverse direction, the potential
difference becomes 10.20V. (a) What is the internal
resistance of the battery? (b) What is the emf of the
battery?

This did i unseated, sorry

British cologoinst admisitrion

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.