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Thermochem Vocab

Thermochemistry Vocabulary Practice w/ Dr. Corey

QuestionAnswer
Thermochemistry the study of heat changes that occur during chemical reactions and phase changes (physical changes of state)
Exothermic PROCESS gives off heat and energy is lost from the system; feels hot
Endothermic PROCESS absorbs heat and energy is added to the system; feels cold
Endothermic REACTION energy taken in and absorbed to do work
Exothermic REACTION energy given off and produces heat
calorie commonly used unit for heat energy
Calorie energy contained in the food we eat, measured in kilocalories
Joule (J) SI unit for heat energy, will primarily be used for our calculations
calorie to Calorie conversion factor 1000 calories = 1 Calorie =1 kilocalorie
Enthalpy (H) amount of heat transferred
units for specific heat j/(g°C) or cal/(g°C)
Law of Conservation of Energy energy cannot be created or destroyed, only converted into different forms
calorimeter device used to measure the absorption or release of heat in chemical and physical processes
melting solid to liquid, endothermic
two forms of energy potential & kinetic
freezing liquid to a solid, exothermic
energy ability to do work or produce heat
type of exothermic reaction fireworks
type of endothermic reaction melting
potential energy stored energy
kinetic energy energy of motion
Hess's Law if you can add two or more thermochemical equations to produce a final equation for a reaction, the sum of the enthalpy changes
water molecules form strong bonds and heat needed to break them
metals weak bonds and no energy needed to break
specific heat amount of heat needed to raise the temperature of a substance
absolute zero temperature in which all molucular motion stops
Kelvin (K) SI unit for temperature
two ways temperature can be measured Kelvin or Celsius
heat (q) energy that is in the process of flowing from a warmer object to a colder one
Created by: Mrs. Corey
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