Two beakers contain clear, colorless liquids. when the contents of the beakers are mixed a white solid is formed. is this an example of a chemical or a physical change?

is a chemical change

Explanation:

chemical change occur when some substances are transformed  into different substances, with different nature and properties, in this case when both liquids are mixed a whithe solid is formed.  this is an example of change of state of the liquids reactants to the solid product, which has properties and characteristics different from that of the initial liquids of the mixture,

physical change: they are all those in which no substance is transformed into a different one.