Objective Students will be able to classify matter

Objective ö Students will be able to classify matter as either a mixture or pure substance.

Agenda ö Prefix Unit Conversion Review ö Classification of Matter Reading

MATTER - Classification of Matter II. Composition of Matter w Matter Flowchart w Mixtures w Pure Substances

Classification Reading w Read page. 277: Ø How is matter classified? Ø What is the definition of Homogenous Mixture? Ø What is the definition of a Heterogeneous Mixture?

Classification Reading w What is an example not listed in the book of a homogeneous mixture? Of a heterogeneous mixture?

Classify the following mixtures as either homogeneous or heterogeneous. 1. 2. 3. 4. 5. 6. Flat soda pop Cherry vanilla ice cream Salad dressing Sugar Soil Aluminum Foil 7. Black coffee 8. Sugar water 9. City air 10. Paint 11. Alcohol 12. Iron

A. Matter Flowchart MATTER yes MIXTURE yes Is the composition uniform? Homogeneous Mixture (solution) no Can it be separated by physical means? PURE SUBSTANCE no Heterogeneous Mixture yes Can it be decomposed by chemical means? Compound no Element

Warm-Up 1. What is the definition of matter 2. How can matter be classified?

Classification Reading w Read p. 278 -279: Ø What properties do all mixtures share? – Separation by Physical Means: This means that you can separate a mixture into its components, and then mix it back together again.

Classification Reading ö One distinguishing characteristic of mixtures is that they can be separated by physical means. Look in your book and find examples of physical means used for separating mixtures. ö List 3 examples of physical means of separation

Classification Reading w Think about a water purifier, what method of separation does it use? What other way would you choose to purify water? w Why do you think it is advantageous to separate mixtures?

Group Challenge w How would you separate a heterogeneous mixture of popcorn kernels and salt? Justify your steps. w Sand magnetic iron filings? w Salt and sand? w Sand water? w Sugar and water?

B. Mixtures ö Variable combination of 2 or more pure substances. ö Homogeneous Mixture (Solution) w even distribution of components w very small particles w particles never settle w EX: saline solution

B. Mixtures ö Heterogeneous Mixture w uneven distribution of components w colloids and suspensions w EX: granite

B. Mixtures ö Colloid w medium-sized particles w Tyndall effect - particles scatter light (looks cloudy) w particles never settle w EX: milk

B. Mixtures ö Suspension w large particles w particles scatter light w particles will settle (needs to be shaken) w EX: fresh-squeezed lemonade

C. Pure Substances ö Element w matter composed of identical atoms w EX: copper

C. Pure Substances ö Compound w matter composed of 2 or more elements in a fixed ratio w properties differ from those of individual elements w EX: salt (Na. Cl)

Vocabulary Chart In your own words: