In witch of these examples does chemical energy change to electrical energy

examples
a)digesting food
b)photosynthesis
c)respiration
d)using a battery

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore

Which suspect most likely committed the robbery and how do you know

Which type of intermolecular force is pbr3