Terminology Flashcards
Define:
Resonance structure
hybrid of possible drawings of a molecule because no 1 Lewis structure can represent the situation
is drawn between possible alternatives
Give examples of:
Resonance structure
SO3
Benzene
Define:
Boiling point
Temperature at which the liquid’s vapour pressure = atm. pressure
Give:
Equation for heat of fusion
Q = m l(f)
Why is density of ice low?
Wide open structure
Give:
Sequence of water mixtures and differences
Differences: diameter of particles dispersed
Solutions - Colloids - Suspensions
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2 immiscible solutions shaken together
Define:
Concentrated Solution
large amount of solute dissolved in solvent
Define:
Dilute Solution
small amount of solute dissolved in solvent
Define:
Saturated Solution
Solution is holding all the solvent possible at that temperature
Dynamic equilibrium
Define:
Unsaturated Solution
Solution is not holding all the solvent possible at that temperature
More solute can go in
Define:
Supersaturated Solution
At a high temperature, you add more solute
When it cools, solution is holding more solute in solution than it should for saturation
When a “seed” particle is added to act as a nucleus, they come out of the solution ==> saturated solution
Define:
Tincture
alcoholic solution of a substance e.g I2
Define:
Molality
m = moles of solute / 1000g of solvent
What determines the change in m.p & b.p?
the number of moles going into the solvent
C6H12O6 —-> 1 mol (non ionising molecular compound)
HCl —–> 2 mol (completely ionising molecular compound)
NaCl —> 2 mol of ionic particles (completely dissociated)
CaCl2 —> 3 mol of ionic particles (completely dissociated)
Define:
Efflorescent
Hydrated crystals which lose the water of hydration on exposure to air
