Molecules, Mixtures, and Reactions

P e P e Atoms don’t always exist alone.

P e P P P N N N e e e

P e P P P N N N e e e I’m stable! Me too! Sometimes atoms become more “stable” when combined with other atoms. Together, they are called a Molecule.

P e P e We Are Stable Together ! Sometimes atoms become more “stable” when combined with other atoms. Together, they are called a Molecule.

Molecules Molecules: When two or more atoms combine. On the left is an example of Sodium (Na) joining with Clorine (Cl) to make NaCl, table salt. Image Courtesy of es/nature/9.a.Ionicbond-nacl.gif

Two Types of Molecules Molecules ElementsCompounds Elements are molecules that consist of only one type of atom. Compounds are molecules that consist of two or more different types of atom. Examples: 1)O 2 2)O 3 3)H 2 Examples: 1)H 2 O 2)CO 2 3)C 6 H 12 O 6

Elements O2O2 O O H2H2 H H O3O3 O O O

Compounds H2OH2O Cl Na NaCl H H CO 2 C O O O

Mixtures

Two Types of Mixtures Mixtures HomogeneousHeterogeneous Homogeneous means that the mixture can be physically separated back to their original forms, if needed. Heterogeneous means that one part has dissolved into another part to make something that can only be separated using chemistry. Examples: 1)Box of crayons 2)Jar of different colored marbles 3)Bag of Halloween Trick or Treat candy. Examples: 1)Kool-aid 2)Saltwater 3)Lemonade Mix

Heterogeneous Mixture Image Courtesy of

Heterogeneous Mixture Image Courtesy ofhttp://imagecache2.allposters.com/images/pic/NGSPOD05/ ~Close-View-of-Colorful-Glass-Marbles-in-a-Jar-Posters.jpg

Heterogeneous Mixture Image Courtesy

Homogeneous Mixture (Solution) Image Courtesyhttp://

Homogeneous Mixture (Solution) Image Courtesy of Mr. Lin

Homogeneous Mixture (Solution) Image Courtesy of Solute: The part that will be dissolved Solvent: The part that will dissolve the solute.

Physical Versus Chemical Reaction

Physical Reaction Physical Reaction: Occurs when something happens, but it remains the same material. Examples: –Ripping Paper –Molding Clay –Cutting Wood Image Courtesy of D7F63AB-A236-44F7-97C9- 208E40917DF5/0/BoardBreak.jpg

Chemical Reaction Chemical Reaction: Occurs when something happens, and the end result is a totally different material than how it started. Examples: –Burning Paper –Food Digesting Image Courtesy of owstone/img/forest_fire%5BHR%5D.jpg

Signs of a Chemical Reaction: Change in Color Image Courtesy of Image Courtesy of n/thumb/7/75/250px- Late_model_Ford_Model_T.jpg

Signs of a Chemical Reaction: Change in Smell or Taste Image Courtesy of mon/detail/71/14/ jpg Image Courtesy of

Chemical Reactions (Show “Traits of Chemical Reactions” Video Segment)