H2O consists of polar molecules. CO2 consists of nonpolar molecules. How do chemists explain the difference? -CO2 does not have polar bonds.
-Oxygen has a different attraction for electrons in H2O than in CO2
-These compounds have different shapes

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

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