Which of the following would be evidence that a chemical reaction has occurred? (Select all that apply.) *

a change in shape
a precipitate is formed
an unexpected change in color
the formation of gas bubbles
smoke begins to form
clear liquids remain clear
the odor changes
the substance becomes very cold

A precipitate is formed: is a chemical reaction because a different solid substance is formed

unexpected color change: is a chemical reaction indicating that a reaction is occurring

the formation of gas bubbles: is an indication of a chemical reaction taking place

smoke begins forming: when we burn wood it releases energy in the form of heat and creates new substances such as smoke and ash

the odor changes: when two or more compounds or elements are mixed and a scent or odor is present a chemical reaction has taken place for example when an egg begins to smell

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