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Chapter 11 Whew! It's Hot!

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Heat . Chapter 11. Whew! It's Hot! . Activator: Boiling water=100°C and 212°F Decide if each temperature is hot Or cold: 60°F 60°C 37°F 37°C 0°C 100°F 70°F. Temperature and thermal energy. Temperature – measure of the average kinetic energy of the particles in an object - PowerPoint PPT Presentation

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Page 1: Heat

Chapter 11

Whew! It's Hot!

Page 2: Heat

Activator:Boiling water=100°C and 212°FDecide if each temperature is hot Or cold:60°F60°C37°F37°C0°C100°F70°F

Page 3: Heat

Temperature and thermal energy

Page 4: Heat

Temperature – measure of the average kinetic energy of the particles in an object

Thermal energy – the TOTAL energy of the particles that make an object

Heat – the transfer of energy between objects at different temperatures

Page 5: Heat

1)Temperature is a measure of the average kinetic energy of the particles in an object

2)The more kinetic energy particles have the higher the temperature will be

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3) Temperature (unlike thermal energy) is not determined by the amount of substance. BUT – if you have more of the substance you will have MORE thermal energy because you have more particles

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Summary Point 1: Talk with the personnext to you and tell them how temperatureand kinetic energy are related?

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4) Thermal expansion is the increase in volume of a substance due to an increase in temperature.

It happens because the particles spread away from each other when heated

When particles spread apart the substance becomes less dense

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5) The three temperature scales we use are Fahrenheit32°F 212°F

Celsius0°C 100°C

Kelvin273K 373K

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Section 2: Heat

Page 11: Heat

6) Heat is the transfer of thermal energy between objects that are at different temperatures.

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7) Thermal Energy is the TOTAL energy of particles that make up a substance.

It depends on temperature and amount of the substance.

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Summary Point 2: What is heat?

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8) The three ways thermal energy is transferred:

ConductionConvectionRadiation

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9) Conduction is the transfer of thermal energy through direct contact between objects

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10) Items that transfer thermal energy well are called conductors (metals)

Items that DO NOT conduct energy well are called insulators

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Every atom is physically bonded to its neighbors in some way. If heat energy is supplied to one part of a solid, the atoms vibrate faster. As they vibrate more, the bonds between atoms are shaken more. This passes vibrations on to the next atom, and so on:           

Eventually the energy spreads throughout the solid. The overall temperature has increased.

Page 18: Heat

11) Convection: transfer of thermal energy by movement in a liquid or gas.

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12) Radiation is the transfer of thermal energy through matter or space as electromagnetic waves.

Examples: light and heat from a fire

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Temperature vs Thermal energy:What’s the difference?

Page 21: Heat

AP #3 Compare and Contrast heat, temperature, and thermal energy

Heat

Thermal EnergyTemperature