Which of the following indicates a change in the chemical properties of matter? a. precipitate formation b. change in heat energy c. butter melting d. both a and b

A.Precipitate formation

Explanation:

During the precipitation two liquid combine and solid is formed. This solid is called precipitate. The formation of precipitation involve chemical reaction that's why it changes the chemical properties of matter.

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) > 2H 2O  (l)

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