Chemistry 17.1 - 17.4
17.1-17.4 Notes
Energy Transformation
Thermo Chemestry Study of energy changes that occur during chemical reactions and changes in state
Chemical Potential Energy energy stored in Chemical bonds
Heat
energy that transfers from one object to another because of a temperature difference between them Heat always flows from a warmer object to a cooler object
Exothermic and Endothermic Processes
System
part of the universe you focus all of your attention to
Surroundings
everything else in univese
Law of Conservation of energy states that in any chemical or physical proccess, energy is neither created or destroyed
Endothermic
one that absorbs heat from the surroundings in a endothermic process the system gains heat as the surroundings cool down
Exothermic
one that releases heat to its surroundings in exothermic process, system gains heat as surroundings cool down units for measuring heat flow heat flow is measured in 2 common units, Calorie and Joule 1 Calorie = 1 kiloCalorie = 1000 calories
Heat Capacity and Specific Heat the heat capacity of an object depends on both its mass and its chemical composition
C = q/m x T = heat/mass(g) x change in temperature(C)
Calorimetry
precise measurement of the heat flow into or out of a system for chemical and physical process in calorimetry, the heat released by the system is equal to the heat absorbed by its surrounding.
Conversely, the heat absorbed by a system is equal to the heat released by its surroundings calorimeter Enthalpy heat content of a sytem
Thermochemical Equations enthalpy change for the reactions can be written as either a reactant or as a product
Questions
38. energy is neither created nor destroyed.
39. heat flows from hot to cold. Touching a cold metal chain
40. Potential energy energy stored in the bonds of a substance
41. depends on mass and chem composition
42 A Calorie is 1000 calories.
43. a) .85 calories
b) 106.12 joules
c)
Energy Transformation
Thermo Chemestry Study of energy changes that occur during chemical reactions and changes in state
Chemical Potential Energy energy stored in Chemical bonds
Heat
energy that transfers from one object to another because of a temperature difference between them Heat always flows from a warmer object to a cooler object
Exothermic and Endothermic Processes
System
part of the universe you focus all of your attention to
Surroundings
everything else in univese
Law of Conservation of energy states that in any chemical or physical proccess, energy is neither created or destroyed
Endothermic
one that absorbs heat from the surroundings in a endothermic process the system gains heat as the surroundings cool down
Exothermic
one that releases heat to its surroundings in exothermic process, system gains heat as surroundings cool down units for measuring heat flow heat flow is measured in 2 common units, Calorie and Joule 1 Calorie = 1 kiloCalorie = 1000 calories
Heat Capacity and Specific Heat the heat capacity of an object depends on both its mass and its chemical composition
C = q/m x T = heat/mass(g) x change in temperature(C)
Calorimetry
precise measurement of the heat flow into or out of a system for chemical and physical process in calorimetry, the heat released by the system is equal to the heat absorbed by its surrounding.
Conversely, the heat absorbed by a system is equal to the heat released by its surroundings calorimeter Enthalpy heat content of a sytem
Thermochemical Equations enthalpy change for the reactions can be written as either a reactant or as a product
Questions
38. energy is neither created nor destroyed.
39. heat flows from hot to cold. Touching a cold metal chain
40. Potential energy energy stored in the bonds of a substance
41. depends on mass and chem composition
42 A Calorie is 1000 calories.
43. a) .85 calories
b) 106.12 joules
c)