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Chapter 2.  Learn about the composition of matter  Learn the difference between elements and compounds  Learn to distinguish between physical and chemical.

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Presentation on theme: "Chapter 2.  Learn about the composition of matter  Learn the difference between elements and compounds  Learn to distinguish between physical and chemical."— Presentation transcript:

1 Chapter 2

2  Learn about the composition of matter  Learn the difference between elements and compounds  Learn to distinguish between physical and chemical properties and changes  Learn to distinguish between mixtures and pure substances  Learn to methods of separating mixtures

3  Can exist in three states – solid, liquid and gas  Can be described in terms of its physical and chemical properties

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7 Matter Mixture Substance Compound Element Heterogeneous Homogeneous Suspension Colloid Solution

8 Classification of Matter

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10  Read Chapter 2  Answer the Focus questions at the end of selected Sections (pages 29 & 41)

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12  Atoms – tiny particles that make up matter  Elements are made of atoms  No two elements are made of the same atoms  Made of one type of atom  Compounds are made of molecules that are made of two or more different atoms bonded together  A specific compound consists of the same particles throughout  Molecules are made of atoms that are “stuck” together  bonded.CO 2  Always have the same composition  same combination of atoms.

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18 1. Oxygen 2. Carbon 3. Carbon monoxide 4. Sugar 5. nylon 1. Copper wire 2. Silver nitrate 3. Lead 4. Salt 5. Magnesium strips

19  Describe a substance’s ability to undergo a change to a different substance

20  Are the characteristics a substance exhibits as long as no chemical change occurs.

21  Involves a change in one or more physical properties, but no change in composition.  The most common physical changes are changes of state:  solid  liquid  gas

22  Transforms a substance into a new substance or substances  Involves a change in the fundamental components of the substance  A given substance changes into a different substance or substances  Are called reactions  Ex. Silver tarnished by reacting with substances in the air  Ex. A plant form a leaf by combining various substances from the air and soil

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24  Has variable composition  Homogeneous mixture (solution)  Has the same properties throughout  Ex.  tea, sugar water, glass, alloys  Heterogeneous mixture  Does not have the same properties throughout  Ex.  granite, salt & pepper, Italian dressing

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34  Two types  Elements  Which cannot be broken down chemically into simpler substances  Composed of tiny particles called atoms.  Each element has a characteristic type of atom.  All elements are on the Periodic table of elements  Compounds  Which can be broken down chemically into elements  Are composed of different types of atoms.  Contain molecules  particles that are composed of atoms bonded to one another  Ex. Sugar, gasoline, baking soda, plastics

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36 1.A multivitamin tablet 2.The blue liquid in your car’s windshield washer 3.A Spanish omelet 4.A diamond 5.Gasoline 6.A jar of jelly beans 7.Chunky peanut butter 8.Margarine

37  Go to classzone.com  Click on science  to find your book  the state of Tennessee  World of Chemistry  Chapter 2  Flip through the flashcards  Take Test 1  Bring results to class tomorrow.

38 CHEMISTRY World of Zumdahl Zumdahl DeCoste

39 1.Iron metal is melted. 2.Wood burns in air 3.A rock is broken into small pieces. 4.Milk turns sour. 5.Iron combines with oxygen to form rust. 6.The inside of an apple turns brown when exposed to air. 7.You make scrambled eggs. 8.You step on a piece of chalk and it becomes powdered. 9.You use a flashlight when the electricity goes out. 10.Steam from hour hot shower condenses on a cold mirror.

40 11.The boiling point of a certain alcohol is 78 0 C. 12.A diamond is very hard 13.Sugar ferments to form alcohol. 14.A gold wire can be flattened and used for foil 15.Gallium metal melts in your hand 16.Platinum does not react with oxygen at room temperature. 17.A dead tree gets chopped for firewood. 18.The copper sheets that form the “skin” of the Statue of Liberty have acquired a greenish coating over the years.


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