Properties of Matter Part 2 Catalyst… 1. Compare Elements and Compounds. Give an example of each. 2. Elements are pure substances that cannot be broken down by chemical means. Compounds are made of 2 or more elements chemically combined. Hydrogen is an element. H2O is a compound. List the States of Matter (SOM) in order of compressibility (highest to lowest). Gas, Liquid, Solid By the End of Class Today… You will be able to… Identify all 5 states of matter in order of particle speed Define Heat and explain how heat moves. Identify the 3 temperature scales. Cite examples of the 3 types of heat transfer. Compare and Contrast endothermic and exothermic heat transfer. Plasma – the 4th State Plasmas are a lot like gases, however the atoms are different. Plasmas are made up of free electrons and ions. Think of Plasmas as an ionized (positively or negatively charged) gas. Examples of Plasma on the Earth… Northern Lights Lightning Striking the Earth Stars are balls of gas at really high temperatures. These temperatures heat up the atoms and create plasma. Synthetic (Man-Made) Plasmas Neon signs contain gases (like Neon) that glow when heated. Fluorescent light bulbs contain gas. When the gas is heated by electricity, a “plasma” is created. Plasma TV’s heat gases behind the screen that mimic plasma. 99% of the KNOWN universe is made of plasma! Bose Einstein Condensate (BEC) – the 5th State The BEC was discovered in 1955 by Cornell and Weiman. However, the BEC was predicted in the 1920’s, but Bose and Einstein…they knew it COULD exist, but lacked the technology to prove it. BEC is based on condensation. BEC’s are the EXACT opposite of plasmas. How it works… Condensation happens as gas particle get closer and closer and form a liquid. This involves a LOSS of energy. BEC happens at SUPER LOW temperatures. Absolute Zero (ZERO KELVIN)is the point at which ALL matter ceases to move. BEC develop as particles approach Absolute Zero. A Little More… As particles begin to form the BEC, they lose ALL their properties and clump. As the temperature continues to approach Absolute Zero the particles collapse and form a BLOB. BEC’s are only possible with a small group of elements. Rubidium is the best example. Who’s the Fastest?? From FASTEST to SLOWEST… PLASMA GAS LIQUID SOLID BEC Some Like it Hot The study of heat is called Thermodynamics! Heat can do ANYTHING Move from place to place Make particles move faster Increase energy Heat IS energy! When you increase HEAT, you are increasing the ENERGY!! More on Heat… Heat moves because of differences in temperature. If temperatures are identical – there is no flow of heat/energy. Heat moves from areas of HIGH concentration (HIGH HEAT/ENERGY) to areas of LOW concentration (LOW HEAT/ENERGY). Heat Transfer…3 types… Convection: Heat transfer by movement of matter. Examples: circular movement as soup cooks in a pan; a convection oven; convection currents in the mantle of the Earth. Conduction: Heat transfer by DIRECT CONTACT. Examples: touching a hot pot; holding a ice cube in your hand; walking barefoot on hot pavement. Radiation: Heat transfer by electromagnetic waves (light). Examples: Heat you can FEEL; Fire; Sun on your face; radio waves; gamma rays, etc. Conductors vs. Insulators Conductors help MOVE energy. Insulators PREVENT energy from moving. Temperature… Temperature is a measure of how fast particles are moving NOT of how hot or cold something may be! There are 3 Temperature Scales. Temperature Scales Fahrenheit Celsius Kelvin Water Boils 2120F 1000C 373K Water Freezes 320F 00C 273K Absolute Zero -4500F -2730C 0K How Does Energy Move?? Endothermic – energy is added or taken in Exothermic – energy is given off or removed Ice Melting = Endothermic Fire = Exothermic Let’s Compare! FUN FACT!! The Melting Point and Freezing Point of a Solid are the SAME!!! ADDING ENERGY = ENDOTHERMIC FUN FACT!! Evaporation and Condensation are EXACT opposites! FUN FACT!! Sublimation and Deposition are OPPOSITES! REMOVING ENERGY = EXOTHERMIC Let’s Play!!! Boards UP! Question #1 List the 5 SOM in order of particle speed (fastest to slowest). Plasma, Gas, Liquid, Solid, BEC Question #2 Give 2 examples of plasmas (1 - naturally occurring and 1- synthetic) Naturally occurring – Northern Lights, Lightning, Stars Synthetic – Fluorescent light bulbs, Neon signs, Plasma TV’s Question #3 At what temperature does the BEC take place on the Kelvin Scale? ZERO Kelvin (approaching Absolute Zero) Question #4 How does heat move? From areas of high concentration to low concentration (hot to cold). Question #5 What type of heat transfer occurs by direct contact? Conduction Question #6 Which of the following options is true? A. Melting and Freezing occur at the same temperature. B. Evaporation and condensation are the exact same process. C. Sublimation and Deposition are the same process. A. is CORRECT! Question #7 What are the 2 ways energy can move? Endothermic and Exothermic Question #8 What is the boiling point on ALL 3 temperature scales? 2120F 1000C 373K Question #9 Define Temperature. A measure of how fast or slow particles are moving. Question #10 Compare conductors and insulators and give an example of each. Conductors help move energy/heat. Example: cookie sheet; copper wire Insulators prevent energy/heat from moving. Example: oven mitts; flannel shirt Complete your 5 Question Wrap Up for Homework! You will have a 10/10 Quiz on ______________…10 Questions in 10 Minutes
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