Warm Up9-1-15 1.Classify the following as pure substance or mixture: kool aid, tap water, air, sugar packet 2. What kind of pure substance is NaCl? 3.

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Warm Up Classify the following as pure substance or mixture: kool aid, tap water, air, sugar packet 2. What kind of pure substance is NaCl? 3. Name the two types of mixtures. 4. An object has a density of 4 g/cm 3 and a volume of 8 cm 3, find its mass. Homework Test Unit 1 + Notebook Check Agenda Turn in Test Review worksheet Go over quiz Notes Unit 2-1 Lab Density Engineering

Quiz Unit 1 Version kg cm cm 3 or 0.25 cm g 5.When mixing different substances but they do not mix and result in layers. Ex. Cereal and milk 6.Bubbles, color change, temperature change, precipitate (forming solids particles Version kg cm cm g 5.When mixing different substances and they mix thoroughly resulting in only 1 layer. Ex. Sugar in water 6.Bubbles, color change, temperature change, precipitate (forming solids particles

Unit 2-1 Substances Are Made of Atoms

Atomic Theory States that atoms are building blocks of all matter. Three laws that support the current atomic theory

Atomic Theory Current Model Electron cloud instead of orbital The atom model will change when new/better data come out

Atomic Theory Law of definite proportions - chemical compound always contain the same elements in the exact same proportions by mass. C 2 H 6 O 2

Atomic Theory Law of conservation of mass – mass cannot be created or destroyed. Mass in reactants equal the mass in products. Sodium acetic carbon sodium bicarbonate + acid > dioxide + acetate + H 2 O 2 grams 2 grams 4 grams total baking soda vinegar solution Sodium acetate and water CO 2 gas

Atomic Theory Law of multiple proportions - the masses of one element which combine with a fixed mass of the second element, are in a ratio of whole numbers. Chemical NameFormulaRatio Nitrogen monoxideNO1:1 Nitrogen dioxideNO 2 1:2 Nitrous oxideN2ON2O2:1 WaterH2OH2O2:1 Hydrogen peroxideH2O2H2O2 1:1

Atomic Theory Elements combine in whole numbers

Dalton’s Atomic Theory 1808 – John Dalton combined the three laws and revised the early Greek idea of atoms Part of his theory are incorrect by today’s standards because of our technology

Dalton’s Atomic Theory 1.Matter is made of atoms, which cannot be subdivided into smaller components 2.Atoms of a element are identical in their physical and chemical properties 3.Atoms of different elements differ in their physical and chemical properties 4.Atoms combine in simple, whole-number ratios to form compounds 5.Atoms are rearrange in a reaction but not created, destroyed or changed (transformed)

Engineering Challenge Density and Archimedes’ Principle -Create a boat to hold as much pennies as possible without sinking

Assignments Notebook checklist 5 days of notes = 25 points – Warm ups - questions/answers/date – Notes - Cornell format – Summary with signature Online homework Extended till 9PM tonight

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