end and eco reactions Flashcards
chemical reactions examples
hydrolysis
oxidation
reduction
addition
combustion
exo and endo
thermal decomposition
what are chemical reactions
reactants to products
usually have an enthalpy change
what is enthalpy
the heat energy transferred in a reaction at constant pressure the units for delta h are kjmol-1
exothermic
energy is transferred to the surroundings
endothermic
energy is taken in from the surroundings
exothermic examples
oxidations
combustion
displacement reactions
neutralisation
hand warmers
fireworks
endothermic examples
thermal decomposition
sherbte
sports ice packs
enthalpy change
measure of heat given out or taken in when a chemical or physical change occurs at constant pressure
represented by delta H
kj per mole
standard conditions
100kpa
298 k
1 mol dm-3
system
reactants and [rpoducta
surroundings
containing equipment and immediate surrounding space
the universe
both the system and the surroundings
enthalpy of formation
the enthalpy change when one mole of a substance is produced from its elements under standard conditions
ΔHf
enthalpy of combustion
when one mole of a substance burns completely in oxygen. with all substances in their standard states
enthalpy of neutralisation
is the energy change associated with the formation of 1 mole of water from a neutralisation reaction
ΔneuH
