What is do you understand by chemical change give example

the type of change in which the chemical composition of an element changes is called chemical change

the best example is the formation of H2O. Since Hydrogen is an inflammable gas and oxygen is consumed by fire to keep burning, but their product - H2O is used to extinguish oxygen

is there multiple choice answers?

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them