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chapter 8 : chemical energetics - Coggle Diagram
chapter 8 : chemical energetics
exothermic reaction
a reaction that transfers heat to the surroundings leading to an increase in the temperature of the surroundings
heat given out from the reactants
has a negative value
physical changes
substances remain chemically the same, no new substance formed
easy to reverse back & easy to separate
change in the physical state
chemical changes
a change in which a new substance is formed
difficult to reverse, energy can be given out / taken in ; thermal decomposition, a reaction that break down into simple substances using heat
endothermic reaction
a reaction that takes in heat from the surroundings leading the temperature of the surroundings to decrease
energy change is positive
enthalpy change
transfer of thermal energy during a reaction
activation energy
minimum amount of energy required for a successful collision
bond energy
energy required to break a particular type of covalent bond
bond breaking : an endothermic process, absorb heat to break the bonds
bond making: an exothermic reaction, release heat to make new bonds