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Chemeketa Community College
Chapter 2: Matter & Energy Larry Emme Chemeketa Community College
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Potential & Kinetic Energy Heating & Cooling Curves
Chapter Outline Potential & Kinetic Energy Energy from Food Temperature Specific Heat States of Matter Heating & Cooling Curves
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Energy Energy = The capacity to cause change Heat Light
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Units of Measurement Metric SI Common Conversions Length Volume Mass
Energy meter (m) m = 1.09 yd liter (L) L = 1.06 qt gram (g) kg = 2.2 lb calorie (cal) 1Kcal = 1000 cal = 1Cal Joule (J) cal = 4.18 J
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Energy Units of Energy = calorie cal kilocalorie kcal
1000 cal = 1 kcal Calorie Cal Cal = kcal joule J 4.18 J = 1 cal British Thermal Unit BTU
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Energy calorie: E to raise 1 g H20 by 1 oC Specific Heat H2O 1 cal
1g 1oC 1oC
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Energy from Food 4 kcal 1 g carb Carbohydrate 9 kcal 1 g fat Fat
Protein 4 kcal 1 g protein
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Units of Measurement Metric SI Common Conversions Length Volume Mass
Energy Temperature meter (m) m = 1.09 yd liter (L) L = 1.06 qt gram (g) kg = 2.2 lb calorie (cal) 1Kcal = 1000 cal = 1Cal Joule (J) cal = 4.18 J Celsius (oC) C = (F-32)/1.8 Kelvin (K) K = C + 273
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Temperature 180o 100o
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Temperature conversion
Common scales used Fahrenheit, Celsius and Kelvin. oF = 1.8 oC + 32 oC = (oF - 32) 1.8 K = oC + 273 SI unit
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Specific Heat E to raise Temp of 1g substance by 1 oC H2O 1.00 cal
1g 1oC H2O 1.00 Fe 0.11 Cu 0.093 Ag 0.057 Al 0.22 Sand 0.19 Au 0.031 Add 1 cal 0oC = start
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Specific Heat E to raise Temp of 1g substance by 1oC H2O 1.00 30o Au
0.031 cal g oC Ag 0.057 20o Cu 0.093 10o Fe 0.11 Sand 0.19 Al 0.22 1o H2O 1.00 Add 1 cal 0oC = start
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Specific Heat H2O 1.00 30o Au 0.031 Low SpHt; Heats quickly Ag 0.057
Cu 0.093 10o Fe 0.11 Sand 0.19 Al 0.22 1o H2O 1.00 High SpHt; Resists change
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Resists change in body temp
Specific Heat Dehydrated person Body temp rises quickly Hydrated person Resists change in body temp Heats quickly Gets hot Sand 0.19 H2O 1.00 Resists change Stays cold
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Elemental states at 25oC Solid Liquid Gas H He Li Be B C N O F Ne Na
Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba Ls Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 2
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Condense Vaporize Melt Freeze
Changes of State Fast, far apart, Random Vapor Condense Vaporize Boiling Pt Moderate, close, Random arrangement Liquid Melting Pt = Freezing Pt Melt Freeze Slow, close, Fixed arrangement Solid
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Changes of State Vapor Deposit Frost Liquid Sublime Freeze Dry Solid
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The End
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End of Chapter Learning Checks Try these after you have reviewed the chapter
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Learning Check Normal body temperature is 98.6°F. What is that temperature in °C? 66.6°C 119.9°C 37.0°C 72.6°C 80.8°C
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Learning Check Answers
Normal body temperature is 98.6°F. What is that temperature in °C? 66.6°C 119.9°C 37.0°C 72.6°C 80.8°C
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Learning Check Which of the following metals is not a solid at room temperature? Iron Aluminum Chromium Calcium Mercury
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Learning Check Answers
Which of the following metals is not a solid at room temperature? Iron Aluminum Chromium Calcium Mercury
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