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par 6.3 salts
6.3 salts
- Some properties of salts
- The structure of salts at micro level
- Formation of ions
- What happens when a salt dissolves in water and when you evaporate a salt solution.
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Scheikunde
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6.3 salts
- Some properties of salts
- The structure of salts at micro level
- Formation of ions
- What happens when a salt dissolves in water and when you evaporate a salt solution.
Slide 1 - Tekstslide
Metals do not conduct electricity in liquid phase
A
yes
B
no
Slide 2 - Quizvraag
Molecular substances conduct electricity in solid phase
A
yes
B
no
Slide 3 - Quizvraag
Slide 4 - Video
Al
2
O
3
is a ...
A
metal
B
molecular substance
C
salt
Slide 5 - Quizvraag
Salts conducts in liquid phase
A
Yes
B
No
Slide 6 - Quizvraag
Properties of salts
High melting- and boiling points, strong bond.
No conductivity in solid state, conducts in liquid state. So there must be freely moving particles in liquid state, but not in solid state.
Slide 7 - Tekstslide
the name for the particles that can conduct electricity
A
atoms
B
molecules
C
ions
Slide 8 - Quizvraag
Formulas of salts
metal ion with non-metal ion.
Example : NaCl sodium chloride ( kitchen salt)
sodium-ion (metal)
chlorine-ion (non-metal)
N
a
1
+
C
l
1
−
Slide 9 - Tekstslide
forming of ions
to conduct there have to be particles with a charge : ions
a salt is built form positive metal-ions and negative non-metal ions.
Slide 10 - Tekstslide
forming of ions
Sodium exchanges the electron in the outer shell with chlorine
Sodium becomes Na
+
Chlorine becomes Cl
-
Na
+
and Cl
-
attrack each other and form a lattice
Slide 11 - Tekstslide
Ionic Lattice
Each Na
+
is surrounded by Cl
-
and vice versa
during solid phase the lattice is in tact, no free moving particles.
during liquid phase the lattice is no longer intact and particles can move freely.
Slide 12 - Tekstslide
salts in water
bond between Na+ and Cl- is called ionic bond , very strong
in dissolving a salt in water, the bond is broken down.
Slide 13 - Tekstslide
salts in water
Each ion is surronded by watermolecules.
In an equation :
NaCl (s) -> Na
+
(aq) + Cl
-
(aq)
NaCl (aq) does not exist. It dissolves immediately.
Slide 14 - Tekstslide
Evaporation
When evaporating a salt solution, exactly the opposite process takes place:
Na+ (aq) + Cl- (aq) --> NaCl(s)
Slide 15 - Tekstslide
monoatomic ions ( one type of ions)
Slide 16 - Tekstslide
polyatomic ions (page 174)
Polyatomic ions are atoms
bonded together
with a charge.
These atoms are
intergrated in the lattice
Slide 17 - Tekstslide
par 6.3
read par 6.3, do questions
Slide 18 - Tekstslide
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