Chemical Reactions Notes __ In a chemical reaction __ with different properties __ are in Existing bonds must be broken ( __ and new bonds must be formed __ Evidence (Indicators) of a Chemical Reaction __ - Change in __ __ - Unexpected __ __ - Produces __ Physical Change: a e are broken a sk __ formed Physical Properties Include: __ roperties Include:)

This question is asking for the evidence or indicators of a chemical reaction. In a chemical reaction, the existing bonds between atoms are broken and new bonds are formed, resulting in the formation of new substances. The evidence of a chemical reaction can be observed through several changes. These include a change in color, the formation of a gas (often seen as bubbles), the formation of a precipitate (a solid that forms and settles out of a liquid), and a change in temperature. These changes indicate that a chemical reaction has occurred because they are the result of the breaking and forming of chemical bonds.