Section 1 Forming New Substances Chapter 14 Section 1 Forming New Substances

Chemical Reactions Chemical Reaction- one/+ things change to produce one/+ new things with new properties

Signs of Chemical Reactions Gas formation bubbles Energy change Light, heat, electricity Solid formation Precipitate- solid in solution Color change Bleach, leaves * These are not always present….sometimes they are not visible

Change in Properties Signs do not guarantee that a chemical reaction is happening Example: boiling water Change in properties is the only way to be sure that a chemical reaction has occurred!!

Breaking and Making Bonds Bonds of starting thing must break Movement and energy Atoms rearrange New bonds form **new bonds= new properties