MATTER NOW LETS DISCOVER MATTER AS MIXTURES THUS FAR WE HAVE REVIEWED MATTER AS PURE SUBSTANCES. PURE SUBSTANCE ELEMENT COMPOUND Carbon (C) H 2 O MIXTURE ?
Classification Matter Has mass and takes up space Mixture Variable Composition Substance Define composition Compound Two or more kinds of atoms Element One kind of atom Heterogeneous Unevenly mixed Homogeneous Evenly mixed
Classifying mixtures The two types of Mixtures : 2) HETEROGENEOUS 1) HOMOGENEOUS Homogeneous Evenly mixed Heterogeneous Unevenly mixed Mixture is formed by two or more elements or compounds that are physically mixed together but not chemically joined. example: salt and pepper
Solvent is the substance in which the solute is dissolved
Mixtures Summary Heterogeneous Mixture (Suspension) Homogeneous Mixture (Solution) Not evenly mixed Evenly mixed Individual components retain their own properties Properties of combined components are usually different than those of each component Individual components can be easily seen Individual components can not be easily seen Can be easily separated Not as easily separated Ex.: salt & pepper mix, rocks, cereal, bag of assorted candy Ex. salt-water solution, tea, kool-Aid drink
Practice Problems 1. He 2. Ho 3. Ho 4. He 5. He 6. Ho 7. He 8. He 9. He 10. Ho 6. Tea 7. Banana nut bread 8. Pizza 9. Blood 10. Brass Determine whether each is a heterogeneous or homogeneous mixture: Answers: Return to index
Classify the following substances as: Pure substance, heterogeneous mixture, or homogeneous mixture Return to index More review Gatorade Homogenous mixture Fruit Loops Heterogeneous mixture Pure substance Gasoline Dirt Heterogeneous mixture Sugar Crystals Pure Substance Air Homogeneous mixture Granite Heterogeneous mixture
Mixtures are combinations of 2 or more substances where each substance retains its individual properties.
HOW ARE MIXTURES DIFFERENT FROM COMPOUNDS? HOW ARE MIXTURES LIKE COMPOUNDS? THEY ARE MADE FROM TWO OR MORE SUBSTANCES MIXTURES DO NOT FORM CHEMICAL BONDS.
HOMOGENEOUS … a mixture that is the same throughout. A homogeneous mixture has a composition and properties that are identical regardless of the sample Ways to identify a homogeneous mixture: A SOLUTION is another name for a homogeneous mixture is
won’t settle out
HETEROGENEOUS … a mixture that is visibly different throughout. Heterogenous mixtures have a composition and properties that differ in any given sample. is Ways to identify a homogeneous mixture: