Question

complete the graphic organizer to describe the signs that indicate a chemical change has occurred. provide an example of each sign. example: toast turning black when it is burnt. change in color. signs of a chemical change. check your understanding. learning goal 1: i can identify the signs of a chemical change. i can list signs that a chemical change is occurring in different scenarios. learning goal 2: i can recall that chemical changes involve the re - arrangement of particles to form new substances. i can describe chemical changes in terms of the arrangement of particles. i can explain what happens to the molecules in a substance when it burns.

Explanation:

Signs of a chemical change include change in color (e.g., toast turning black when burnt), production of gas (like when vinegar and baking - soda react to form carbon - dioxide bubbles), formation of a precipitate (when two solutions react to form an insoluble solid), change in temperature (exothermic or endothermic reactions such as burning wood which is exothermic), and change in odor (rotting food developing a foul smell).

Answer:

Sign of Chemical Change	Example
Production of gas	Vinegar and baking - soda reaction producing carbon - dioxide bubbles
Formation of a precipitate	Mixing silver nitrate and sodium chloride solutions to form silver chloride precipitate
Change in temperature	Burning wood (exothermic)
Change in odor	Rotting food developing a foul smell