Chapter 8 Energetics (8.1-8.3) Flashcards
(26 cards)
What are the two types of reactions
Endothermic
Exothermic
Energy change in an exothermic reaction and temp of surroundings
Energy is given out and temp of surroundings increase
EXO SKELETON - OUTSIDE
What are the reactants in the reactions
Particles - atoms molecules or ions
Equation for exothermic reactions
and what’s >
Reactants —> Products + Thermal energy
Energy of reactants > energy of products
Which energy and where is energy stored in reactants (exothermic)
Chemical energy in the bonds
Energy level diagram for exothermic
Up to down
Energy change in endothermic reactions and temp of surroundings
Energy is taken in from surroundings
Temp of surroundings decrease
Equation for endothermic
and what’s greater
Reactants + Thermal energy —> Products
Energy of products > energy of reactants
What is a reaction pathway diagram and another name
Shows how energy changes during a reaction
Energy level diagram
What is enthalpy and symbol
The change in energy
Delta H
Unit of Enthalpy
Kilojoule per mole
kJ/mol
What is the activation energy
Minimum amount of energy colliding particles must have in order to react.
Describe energy changes in terms of bonds in endothermic
Energy taken in to break bonds > energy released in making bonds
How to calculate delta H
Energy in - energy out
If Delta H is positive then which reaction
Endothermic
Delta H is negative which reaction
Exothermic
Which type of reaction requires more activation energy
Endothermic
Endothermic is which kind of bond process
Bond breaking
Exothermic is which kind of bond process
Bond making
Where is activation energy gained from
Surroundings
Bunsen burner
etc
Example of exothermic reactions
Burning coal and other fossil fuels
Example of endothermic
Reactions in cooking
Sherbet candy.
what type of reactions are decompositions
endothermic they take in energy
what type of reactions are combustion reactions
exothermic, they give out energy
