Lattice energy is the energy change when 1mol of an compound is formed from its ions under
Values of lattice energy are
always positive
always negative
can be negative or positive
Enthalpy change of atomisation is the enthalpy change when 1mol of gaseous ions is formed from the in its
First electron affinity is the enthalpy change when one is added to each atom in 1 mol to form 1 mol of -1 gaseous .
What are the factors that affect lattice enthalpy?
Charge on the ions
Amount of ions present
Temperature
Radius of the ions
The higher lower( higher, lower ) the charge on the ion the higher lower( higher, lower ) the lattice enthalpy.
Enthalpy of hydration is the change when 1 mol of gaseous ions completely dissolve in
Label the Born Haber Cycle with the process occurring at each stage.
is the heat change when 1 mol of an ionic substance dissolves in water
An ionic lattice dissloves in water because water molecules disrupt the attraction between and in the lattice. Cations become surrounded by the part of the water molecules. Anions become surrounded by the part of the water molecules.
Enthalpy of Hydration is ...
sometimes positive, sometimes negative
Entropy is the measure of the of a .
A disorder increases entropy...
decreases
increases
can't tell
is unchanged
Entropy decreases as the solid becomes more complex.
Entropy from solid to liquid to gas because molecules become .
There is only a small jump in entropy from ice to water despite the state change as the means water is still relatively .
Which factors cause a change in entropy
temperature change
addition of a catalyst
change in volume
number of gas molecules
state change
concentration change
If Gibbs Free Energy is 0 this means
the substance is an element or the reaction is at equilibrium
the reaction is spontaneous
work must be supplied from the surroundings for the reaction to occur
If Gibbs Free Energy is less than 0 this means...
If Gibbs Free Energy is greater than 0 this means...
the substance is an element of the reaction is at equilibrium
work must be supplied from the surrounding for the reaction to occur
If delta (the little triangle symbol) G is negative delta S must be and delta H . The reaction will be spontaneous.
If total entropy is positive the reaction is .
total entropy = entropy of + entropy of
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