Tuesday, October 20 Objective: Students will be able to compare and contrast different models of the atom. Quick Chem: ONLY WRITE THE ANSWER Atoms are so small that even our very best microscopes can just show us vague outlines—no details about what they look like. How do scientists know what atoms are made of or what they look like? What do you think? Write three ideas that express what you think.

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Tuesday, October 20 Objective: Students will be able to compare and contrast different models of the atom. Quick Chem: ONLY WRITE THE ANSWER Atoms are so small that even our very best microscopes can just show us vague outlines—no details about what they look like. How do scientists know what atoms are made of or what they look like? What do you think? Write three ideas that express what you think.

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Tuesday, October 20 Objective: Students will be able to compare and contrast different models of the atom. Quick Chem: ONLY WRITE THE ANSWER Atoms are so small that even our very best microscopes can just show us vague outlines—no details about what they look like. How do scientists know what atoms are made of or what they look like? What do you think? Write three ideas that express what you think.

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Tuesday, October 20 last chance to view BR - 1 min Objective: Students will be able to compare and contrast different models of the atom. Quick Chem: ONLY WRITE THE ANSWER Atoms are so small that even our very best microscopes can just show us vague outlines—no details about what they look like. How do scientists know what atoms are made of or what they look like? What do you think? Write three ideas that express what you think.

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October 20, 2009 AGENDA: 1 – Quick Chem and Discussion 2 – Brain POP! Notes 3 – Finish Notes on Atoms 4 – Venn Diagram. Today’s Goal:  To compare and contrast different models of the atom.  HOMEWORK: 1. Read Section Answer questions 7,8,10,11 on page 114. Due Thursday 2. From Last Week: Make vocab flashcards for the vocabulary from sections 3.1,3.2 and 3.3. Answer q.1-4 on pg 75.

Cornell Notes Ms. Barkume 10/20 Democritus vs. Dalton Model of the Atom What was Democritus’ model of the atom? ( B.C.) What was John Dalton’s model of the atom? ( )  Matter is composed of atoms, which move through empty space  Atoms are solid, homogeneous and indestructible and indivisible  Different kinds of atoms have different sizes and shapes  Size, shape, and movement of atoms determines the properties of matter.  Matter is composed of extremely small particles called atoms  Atoms are indivisible and indestructible  Atoms of a given element are identical in size, mass and chemical properties  Atoms of a specific element are different from those of another element  Different atoms combine in simple, whole number ratios to form compounds  In a chemical reaction, atoms are separated, combined or rearranged. Summary: Finish as homework.

Exit Slip  Make a VENN DIAGRAM comparing and contrasting the atomic model of Democritus and Dalton. DemocritusDalton

Periodic Table Scavenger Hunt 1. What charge does Na have? 2. What is the group name of the group that Na is in? 3. Sulfur is a metal. True/False 4. Iron is a metal. True/False 5. Argon is a non-metal. True/False 6. What is the charge on silver, Ag? 7. The charge on Cl is + 1. True/False 8. The name of Fe is? 9. What group is Bromine in? 10. Mercury and ___________ are liquids.

Cornell Notes Ms. Barkume 10/19 Elements, Compounds and Mixtures What is a mixture? What are two types of mixtures? What is an element? What is a compound? A combination of two or more pure substances in which each pure substance retains its individual chemical properties. Homogeneous: a mixture with a constant composition throughout. Heterogeneous: a mixture that does not blend smoothly throughout where individual substances remain distinct. An element is a pure substance that cannot be seperatied into simpler substances by physical or chemical means. A compound is made up of two or more different elements that are combined chemically. Summary: Finish as homework.

ELEMENTS, COMPOUNDS, & MIXTURES Graphic Organizer

States of Matter Review Definite shapeIndefinite shape Definite volume Indefinite volume solid liquid gas

Cornell Notes Ms. Barkume 10/14 Review: Chemical vs. Physical Changes What are the main differences between physical and chemical changes? Example of Physical changes: Examples of chemical changes: Melting ice, crumpling paper, freezing water, cutting metal etc. Any chemical reaction, Metal rusting, fruit ripening, cooking meat, burning gasoline in a car etc. Summary: Finish as homework. Physical ChangeChemical Change Changes a characteristic that can be measured or observed without changing the sample’s composition. Reversible. Ability to combine with one or more substances to form a new substance. Ex. Color change, change in temperature, gas is evolved.

Cornell Notes Ms. Barkume 10/14 Review: Phase Changes What are phase changes? Physical changes that occur between the 3 states of matter. Summary: Finish as homework. Solid Liquid Gas Freezing Melting Evaporation Condensation Sublimation

Cornell Notes Ms. Barkume 10/14 Law of Conservation of Mass What is the law of conservation of mass? Example: Mass can neither be created nor destroyed, only changed. Mass reactants (beginning) = Mass products(end) Mass is conserved; products have same mass of reactants. In a car’s catalytic converter CO reacts with 16 grams of O 2 to form 44 grams of CO 2. How much CO was reacted? Mass reactants = Mass products M CO + 16 grams O 2 = 44 grams CO 2 M CO = 44 grams – 16 grams M CO = 28 grams Summary (finish for homework or in class if time permits)

Cornell Notes Ms. Barkume 10/14 Law of Conservation of Mass What is the law of conservation of mass? Examples: (put these in your notebook. #3 is your exit slip, put on another sheet of paper and turn it into the homework bin before you leave). Mass reactants (beginning) = Mass products(end) grams of hydrogen gas was reacted with 79.4 grams of oxygen to from water. How many grams of water was formed? grams of sodium metal (Na) was reacted with an excess of chlorine gas (Cl) to from 39.7 grams of NaCl (table salt). How much Chlorine gas (Cl) was reacted? 3. A 10.0 gram sample of magnesium (Mg) reacts with oxygen (O 2 ) to form 16.6 grams of magnesium oxide (MgO). How many grams of oxygen reacted? 4. Challenge: of HCl gas reacted with an unknown amount of NH 3 to produce grams of NH 4 Cl. How many grams of NH 3 reacted? Summary (finish for homework or in class if time permits)

Cornell Notes Ms. Barkume 10/14 Mixtures and Solutions What are mixtures? What are types of mixtures? What are solutions? Types of solutions: Mixtures are combination of two or more pure substances where each retains its chemical properties. Heterogeneous: does not blend smoothly throughout, individual substances remain distinct. (ex. Salad dressing, OJ with pulp) Homogeneous: Constant composition throughout; a small sample will include all parts of the mixture. (ex. Salt water, air, metal alloys) Homogeneous mixtures are also referred to as solutions. There is a constant composition throughout. Can be any phase of matter. Gas-Gas, Gas-Liquid, Liquid-Liquid, Liquid-Solid, Solid-Solid Summary (finish for homework or in class if time permits)