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Heat and Energy

Chemistry Honors - Krug

TermDefinition
Activated Complex a high-energy compound that is formed after the reactant phase and before the product phase
Enthalpy the amount of heat given off; heat in chemical bonds
Activation energy the energy required to start a reaction; Ea
Exothermic Reaction a reaction where heat is given off; hot to the touch
Endothermic Reaction a reaction where heat is absorbed by the molecules; cold to the touch
Four Ways to Speed Up a Reaction Add a catalyst Increase the temperature Increase concentration Decrease particle size
A 10°C increase in temperature will... Double the reaction rate
A catalyst... Speeds up a reaction without getting consumed and lowers the activation energy
When particles are closer together... They collide more often
When particles are smaller... The material has a greater surface area, resulting in more active sites
Change in Enthalpy ΔH
Q The amount of heat transferred; Joules
M Mass; grams
C Specific Heat Capacity; J/(kg °C)
Specific Heat Capacity An object's resistance to temperature change
ΔT Change in temperature, °C
Created by: annabelle.mills
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