Which of the following is a chemical change?

formation of a solid from two liquids
phase change
change in surface area
volume change

A. formation of a solid from two liquids

Explanation:

A chemical change is the process that forms new products by formation of new bonds and group transfer between substrates. Any change in physical features of chemicals with no formation of new products is termed as physical change. Transition of phases of matter, change in surface area and volume are the physical changes. Formation of a solid (a new product) from two liquids represents chemical change.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

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