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What’s the MATTER, Definition, States, and Change of State
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MATTER, Definition, States, and Change of State At the conclusion of our time together, you should be able to: 1. Define matter 2. Define the various states of matter and draw an example of each state 3. Recognize that particle motion determines the state of matter
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Matter: Anything that has mass and takes up space Matter is made up of building blocks: atom – smallest unit of an element. element – a pure substance made of only one kind of atom. compound – made of two or more atoms that are chemically combined.
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FYI 90% of the Earth’s crust is made up of only 5 elements: Oxygen49.2% Silicon25.7 % Aluminum 7.5% Iron 4.7% Calcium 3.4%
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States of Matter Solid- Definite volume and shape Particles are tightly packed Slight expansion when heated Incompressible
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Solid Vibration around fixed points
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Liquid- Has definite volume, but no definite shape (assumes the shape of the container) Particles are loosely packed (can flow by sliding over each other) Easily expand when heated Considered incompressible States of Matter
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Liquid Vibration around sliding points
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Gas- No definite shape or volume Expand to fill the container Particles are spaced far apart Compressible States of Matter
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Gas Vibration around moving points
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Plasma- Consists of electrically charged particles It’s an ionized gas Common in space, but very rare on Earth Found in lightning, fluorescent lights and neon signs States of Matter
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Plasma “Super-heated Gas” When atoms are so hot, they lose ALL of their electrons. When atoms are so hot, they lose ALL of their electrons.
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Energy Amounts in States of Matter Solid- little energy, particles vibrate and rotate Liquid- more energy, they move freely by sliding over each other Gas- even more energy, move quickly Plasma- most energy, move extremely fast
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Solid Liquid Gas Plasma Made of Atoms Holds its shape Atoms move past each other
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States of Matter Changes of State Solid Liquid Gas Energy
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Names of Phase Changes Solid to Liquid= Melting Liquid to Gas= Boiling/evaporation Gas to Liquid= Condensation Liquid to Solid= Freezing Solid to Gas= Sublimation Gas to Solid= Deposition
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Boiling Melting Freezing Condensation DepositionDeposition
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Matter, Classify Matter At the conclusion of our time together, you should be able to: 1. Classify a mixture of matter based on their physical and chemical properties 2. Characterize various types of matter
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Types of Matter Pure Substance- Matter with a fixed composition It has distinct properties Examples =elements compounds
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Types of Matter Mixtures- Most matter is a mixture The composition is not fixed (changes from sample to sample) Two Types – Homogeneous Heterogeneous
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Homogeneous Mixtures Composition is uniform throughout Solution- Particle size = 0.01 – 1 nm Doesn’t settle out upon standing Can’t be separated by filtering Doesn’t scatter light Example = salt water
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Heterogeneous Mixtures - Suspension The sample varies in composition, properties and appearance No uniformity Particle size is greater than 1000 nm Particles settle out upon standing Can be separated by filtration Might scatter light Examples = soil, trail mix, pond water
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Colloid- Particle size = 1 – 1000 nm Doesn’t settle out upon standing Can’t be separated by filtering Scatters light (Tyndall Effect) Examples = milk, gelatin, smoke Hetereogeneous Mixtures
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Let’s Look at Some Examples: Mixtures are variable combinations of 2 or more pure substances. Heterogeneous – visibly separate phases Homogeneous – Same throughout
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Matter, Classify Changes of Matter At the conclusion of our time together, you should be able to: 1. Characterize various changes of matter 2. Recognize that a change of state in matter is a physical change
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Physical Physical Change A change in matter from one form to another without changing its chemical properties (most can be reversed) No change in atoms/molecules
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Physical Change Examples = Change in state or phase change Dissolving Compressing Light emission/absorption Electrons passing through metals
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Physical Change More Examples = boiling of a liquid melting of a solid dissolving a solid in a liquid to give a homogeneous mixture making a solution
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Properties Every substance has a unique set of properties (characteristics that identify that substance) Physical Properties- Properties that can be measured without changing the identity and composition of the substance
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Physical Property Examples- Color Odor Density Melting Point Boiling Point Hardness Solubility
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Chemical Chemical Change Bonds are made / broken Change in oxidation states Bonds are made / broken Change in oxidation states Cl -1 2121 Li +1
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Examples of Chemical Change Chemical change or chemical reaction — transformation of one or more atoms or molecules into one or more different molecules. Burning hydrogen (H 2 ) in oxygen (O 2 ) gives H 2 O.Burning hydrogen (H 2 ) in oxygen (O 2 ) gives H 2 O.
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Sure Signs of a Chemical Change “Chemists Get Practice Trying Labs” Color Change Gas Produced (not from boiling!) Precipitate – a solid formed by mixing two liquids together Temperature Change Light
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Chemical Properties Properties that describe the way a substance may change to form other substances Only observed when a chemical reaction takes place
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Chemical Property Examples Combustible Reactive with water or acid Flammable Corrosive Decomposes in air
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Remember the Law of Conservation of Mass In a physical change or a chemical reaction, mass is neither created or destroyed (Antoine Lavoisier)
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What’s the MATTER Classify Matter Let’s Put it All Together in a Chart!!
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Is the composition uniform? NoNoYes MATTER Can it be physically separated? Homo- geneous Mixture (solution) Hetero- geneous Mixture Compound MIXTURE PURE SUBSTANCE Yes NoNo Can it be chemically decomposed? NoNo Yes Suspensions Element Colloids
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