Why is wood a heterogeneous mixture?
Wood, as you may know, is a heterogeneous mixture. But why? It is because all the elements and compounds in a piece of wood are not mixed evenly throughout the wood. One sample of wood may have more water/oxygen than another area, or one sample may have some tree sap, while another may not. A heterogeneous mixture is a mixture in which all the compounds/elements are mixed in different proportions throughout the mixture; this is the case with wood.