Changes Exothermic vs Endothermic. Changes Exothermic vs Reaction that releases heat Endothermic-Absorbs heat.

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Thermochemistry the study of transfers of energy as heat that accompany chemical reactions and physical changes.
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Presentation transcript:

Changes Exothermic vs Endothermic

Changes Exothermic vs Reaction that releases heat Endothermic-Absorbs heat

Exothermic Endothermic making ice cubesmelting ice cubes formation of snow in cloudsconversion of frost to water vapor condensation of rain from water vapor evaporation of water a candle flameforming a cation from an atom in the gas phase mixing sodium sulfite and bleachbaking bread rusting ironcooking an egg burning sugarproducing sugar by photosynthesis

Heat versus temperature HEAT (q) Measure of the total energy in a substance Sum of energy of all particles(kinetic energy and potential energy) Units: Joule (kgxm 2 /s 2 ) kJ TEMPERATURE Related to the Average KE of particles in a sample Units: K or C

3 things that the quantity of heat transferred are dependent on: Nature of the material changing temperature Mass of the material changing temperature Size of temperature change

Specific heat Amount of energy needed to raise the temp of 1 g of a substance 1 C (a calorie is the amount of heat required to raise the temperature of 1 g of H 2 O 1 C) 1 cal=4.184 J Helps you to determine how many joules or calories it takes a known mass of something to change from one temperature to another Symbol: c p Unit: J/(g.K) Formula: c p = q/m  T q-amt of energy lost or gained m-mass  T= temperature change

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