LecturePLUS Timberlake1 Chapter 6 Energy and States of Matter Energy Measuring Temperature

LecturePLUS Timberlake2 Energy Makes objects move Makes things stop Energy from sun plants foods we eat energy to live We need energy to “do work”

LecturePLUS Timberlake3 Work is done when Go up stairs Play soccer Lift a bag of groceries Ride a bicycle Breathe Heart pumps blood Water goes over a dam

LecturePLUS Timberlake4 Potential Energy Is stored energy Examples Water behind a dam Compressed spring Chemical bonds in gasoline or coal Food

LecturePLUS Timberlake5 Kinetic Energy Is energy of motion Examples Hammering a nail Water flowing over a dam Working out Boxing Burning gasoline

LecturePLUS Timberlake6 Some Forms of Energy Mechanical Electrical Thermal (heat) Chemical Radiant (light)

LecturePLUS Timberlake7 Learning Check E1 A. A car uses more fuel when the air conditioner is on. True (1) or False (2) B. An apple hanging on a tree has potential energy that can turn into both mechanical or chemical energy. True (1) or False (2)

LecturePLUS Timberlake8 Solution E1 A. A car uses more fuel when the air conditioner is on. True (1) B. An apple hanging on a tree has potential energy that can turn into both mechanical or chemical energy. True(1)

LecturePLUS Timberlake9 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the substance gets hotter. When a substance gets hotter, its temperature goes up.

LecturePLUS Timberlake10 Learning Check E2 Suppose you place water in a freezer. A. The water particles move 1) faster 2) slower 3) the same B. The water will get 1) hotter 2) colder 3) stay the same C. The temperature of the water will be 1) higher 2) lower 3) the same

LecturePLUS Timberlake11 Solution E2 Suppose you place water in a freezer. A. The water particles move 2) slower B. The water will get 2) colder C. The temperature of the water will be 2) lower

LecturePLUS Timberlake12 Temperature Measures the hotness or coldness of an object Determined by using a thermometer that contains a liquid that expands with heat and contracts with cooling.

LecturePLUS Timberlake13 Temperature Scales Fahrenheit Celsius Kelvin Water boils _____°F _____°C ______K Water freezes _____°F _____°C ______K

LecturePLUS Timberlake14 Temperature Scales Fahrenheit Celsius Kelvin Water boils 212°F 100°C 373 K Water freezes 32°F 0°C 273 K

LecturePLUS Timberlake15 Units of Temperature between Boiling and Freezing FahrenheitCelsius Kelvin Water boils 212°F 100°C 373 K 180° 100°C 100K Water freezes 32°F 0°C 273 K

LecturePLUS Timberlake16 Learning Check E3 A. Temperature of freezing water 1) 0°F 2) 0°C 3) 0 K B. Temperature of boiling water 1) 100°F 2) 32°F 3) 373K C. Number of Celsius units between the boiling and freezing points of water 1) 1002) 180 3) 273

LecturePLUS Timberlake17 Solution E3 A. Temperature of freezing water 2) 0°C B. Temperature of boiling water 3) 373K C. Number of Celsius units between the boiling and freezing points of water 1) 100

LecturePLUS Timberlake18 Fahrenheit Formula 180°F = 9°F =1.8°F 100°C 5°C 1°C Zero point: 0°C = 32°F °F = 9/5 T°C + 32 or °F = 1.8 T°C + 32

LecturePLUS Timberlake19 Celsius Formula Rearrange to find T°C °F = 1.8 T°C + 32 °F - 32 = 1.8T°C ( ) °F - 32 = 1.8 T°C °F - 32 = T°C 1.8

LecturePLUS Timberlake20 Temperature Conversions A person with hypothermia has a body temperature of 29.1°C. What is the body temperature in °F? °F = 1.8 (29.1°C) + 32 exact tenth's exact = = 84.4°F tenth’s

LecturePLUS Timberlake21 Learning Check E4 The normal temperature of a chickadee is 105.8°F. What is that temperature in °C? 1) 73.8 °C 2) 58.8 °C 3) 41.0 °C

LecturePLUS Timberlake22 Solution E4 3) 41.0 °C Solution: °C = (°F - 32) 1.8 =( ) 1.8 =73.8°F 1.8°= 41.0°C

LecturePLUS Timberlake23 Learning Check E5 Pizza is baked at 455°F. What is that in °C? 1) 437 °C 2) 235°C 3) 221°C

LecturePLUS Timberlake24 Solution E5 Pizza is baked at 455°F. What is that in °C? 2) 235°C ( ) = 235°C 1.8

LecturePLUS Timberlake25 Learning Check E6 On a cold winter day, the temperature falls to -15°C. What is that temperature in °F? 1) 19 °F 2) 59°F 3) 5°F

LecturePLUS Timberlake26 Solution E6 3) 5°F Solution: °F = 1.8(-15°C) + 32 = = 5°F

LecturePLUS Timberlake27 Kelvin Scale On the Kelvin Scale 1K = 1°C 0 K is the lowest temperature 0 K = - 273°C K °C K = °C + 273

LecturePLUS Timberlake28 Learning Check E7 What is normal body temperature of 37°C in kelvins? 1) 236 K 2) 310 K 3)342 K

LecturePLUS Timberlake29 Solution E7 What is normal body temperature of 37°C in kelvins? 2) 310 K K = °C =37 °C =310. K