Presentation on theme: "PUT THIS IN YOUR NOTEBOOK"— Presentation transcript:
1 PUT THIS IN YOUR NOTEBOOK SC.7.P Recognize that adding heat to or removing heat from a system may result in a temperature change and possibly a change of state.SC.7.P Observe and describe that heat flows in predictable ways, moving from warmer objects to cooler ones until they reach the same temperaturePUT THISIN YOURNOTEBOOKVocabulary (Make cards/flaps): VaporizationTemperatureEquilibrium (p. 290)ConvectionThermal ConductorConductionThermal InsulatorRadiationHeat
2 First Things First…Go Over QuizGo Over Bill Nye Video
3 Essential QuestionsWhat is the difference between heat and temperature?How does an increase or decrease in heat affect molecules?What causes a change of state in matter?What are the predictable ways that heat flows?
4 Kinetic Molecular Theory Helps explain the movement of particles in matter.Has 3 main pointsAll matter is made of tiny particles, like atoms and moleculesThese particles are in constant, random motionThese particles constantly collide with each other and with the walls of their container.
5 Friday Warm-Up What are the 3 main states/phases of matter? How do you think matter moves within the 3 states of matter?
6 Particle Speed in Matter Solid- particles vibrate in place (SLOW) Liquid- particles slide past each other (FASTER) Gas- particles move freely (FASTEST)
7 Thermal EnergyThe sum of the kinetic energy and the potential energy of the particles that make up an objectThe more molecules an object has, the more thermal energy it has.
8 TemperatureThe measure of the average kinetic energy in the particles in a material.If an object feels cold, it’s molecules have low kinetic energy.The SI unit for temperature is Kelvin (K), but scientists often use Celsius (C).In the US, we usually use Fahrenheit (F) to measure temperature.
9 Temperature Scales Kelvin (K) Celsius (C) Fahrenheit (F) Water Boils At:Water Freezes At:Kelvin (K)Water boils at 373KWater freezes at 273KAbsolute Zero (coldest possible temperature) means no movement of particles. 0KCelsius (C)Fahrenheit (F)Water boils at 100CWater boils at 212FWater freezes at 0CWater freezes at 32F
10 HeatThe movement of thermal energy from a region of higher temperature to a region of lower temperatureThermal energy ALWAYS moves from warm to cold.Eventually, both objects will reach thermal equilibrium.The molecules inside the warmer object will transfer some heat to the molecules inside the colder object until they have the same temperature.
11 Heat Transfer There are three types of heat transfer: Convection ConductionRadiation
12 Monday Warm-UpChoose a NEW seat RESPONSIBLY! DO NOT SIT WITH PEOPLE YOU WILL YAP TO… OR CARDS WILL BE WRITTEN ON!What are 3 things that you remember from last week’s heat lessons?
13 ConductionThe transfer of thermal energy by collisions between particles in matter.In other words… heat is transferred through direct contact .Molecules transfer energy to the molecules next to them.
14 ConvectionThe transfer of thermal energy by the movement of particles from one part of a material to another.In other words, through the movement of currents (circular)Warm air/liquids are less dense and rise, cool air liquids are more dense and sink.
15 Radiation The transfer of thermal energy by electromagnetic waves. In other words, no direct contact needed.
17 So what happens to matter when heated/cooled? Stand upStay quiet
18 So what happens to matter when heated/cooled? Most materials contract (shrink) when they are cooled….and expand (grow) when they are heated.This happens because as we have already learned, molecules move faster (and occupy more volume) when heated and slower (occupy less volume) when cooled.This is called thermal expansion and thermal contraction.Water is an exemption to thermal contraction… when it cools down, it expands.
19 When thermal energy is added or removed from a system…. At the very least, a temperature change occurs.If enough thermal energy is added or removed, a change of state occurs.
20 SIT QUICKLY AND QUIETLY GET OUT YOUR NB AND PEN/PENCIL DEMO TIMESIT QUICKLY AND QUIETLYGET OUT YOUR NB AND PEN/PENCIL
21 Changes Between Solids and Liquids HeatHeat(make cold)
22 Changes Between Liquids and Gases HeatHeat(make cold)
23 Changes Between Solids and Gases HeatHeat(make cold)
24 Conductors and Insulators A thermal conductor is a material in which thermal energy moves quickly- it transfers thermal energy easilyUsually made of more dense materialsA thermal insulator is a material in which thermal energy moves slowly- it does not transfer thermal energy easilyUsually made of less dense materials