Enlist any four examples of chemical change ?

heat

wather

climate

cold

1)burning of wood

2)digestion of food

3)process of photosynthesis

4)cooking of food

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

the ratio of the conjugate base to the acid required to attain the desired ph.