Ch 2 Classifying Matter 1

Starter What is the density of an object with a mass of 40g and takes up 50mL of space? Will this object float in water? What is the volume of an object with a density of 50g/mL and a mass of 25g?

Draw the following chart on your paper make it big enough to fill the page & large enough to write in boxes

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Pure Substance Matter that always has exactly same composition ex: salt sugar gold 5

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Atom—the smallest particle of an element Ex: Carbon (C), Oxygen (O), Neon (Ne), Carbon (C), Platinum (Pt), Mercury (Hg) 7

Always joined in a fixed proportion Ex: Compound Always joined in a fixed proportion Ex: Water (H2O) Salt (NaCl) Steam 8

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Homogeneous mixtures contain substances that are uniformly spread out Mixture-Homogeneous Homogeneous mixtures contain substances that are uniformly spread out aka: Solution Ex: Vinegar, Syrup 10

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Mixture-Heterogeneous Heterogeneous mixtures have easily distinguished parts Ex: Pizza Salsa Chili 12

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Mixture-Heterogeneous Colloids scatter light & the particles never settle Ex: Milk, smoke, fog Suspensions contain a liquid in which the visible particles settle Ex: OJ, Italian Dressing “shake it, shake it” 14

Separating mixtures Filtration – process of separating a mixture based on particle size ex: coffee filter or air filter Distillation – the process of separating a mixture based on the boiling points of the materials

Simple Distillation

Law of Conservation of Mass Matter is neither created nor destroyed mass of all substances present before a change =mass of all substances remaining after change 17

Physical Properties characteristic of a material you can observe w/o changing substances that make up the material 18

Physical Properties Odor Texture Sticky Length Solubility Temperature Stretchable Luster Taste Magnetic Malleability hard/soft Length Temperature Mass boiling point Volume melting point Density conductivity 19

change that does not alter the identity of substances in a material Physical Changes change that does not alter the identity of substances in a material 20

Physical Changes Ex 1. Breaking 6. Shredding 2. Pounding 7. Crushing 3. Cutting 8. Bending 4. Dissolving 9. Grinding 5. Folding 10.State Changes!?! 21

Chemical Properties-ability to undergo a chemical change Ex: Flammability is the ABILITY to burn (property) not actually being on fire (change) 22

Reacts w/ light (fading) Flammability Chemical Properties Reacts w/ light (fading) Flammability Reacts w/ oxygen – rust or tarnish Reacts w/ water Reacts w/ acid Can form a precipitate 23

 Tarnished Copper Tarnished Silver  Rust

change of a substance into new substances Ex 1. Rusting 2. burning Chemical Changes change of a substance into new substances Ex 1. Rusting 2. burning 3. Tarnishing 4. formation of a precipitate 25

Chemical Changes *Signs or indicators Fizzing Bubbling color change 26

Form-ing a precipitate

STAR Questions List some indicators of a chemical change Fizzing, bubbling, color change, precipitate Describe difference between property and change Property is object’s ability to change, a change is action, it’s happening What type of change is evaporating? State changes = physical changes

Chemical and Physical Change Foldable Under the panel listed physical properties you should list the physical properties from your notes. Under the panel Chemical Properties you should list them from your notes. Under the panel Physical change you should list some scenarios that indicate a physical change. Ex. Cutting paper Under the panel chemical change you should list at least five scenarios that indicate chemical change. Ex. Rust You should also include some drawings or pictures from the magazines to go along with you foldable.