Note Taking Guide: Episode 501
Camille Levy
Name______________
valence
A chemical bond - forms when 2 or more atoms rearrange ____________
electrons
stability
_____________
to increase ________________.
electrons
transferred
ionic bond - forms when valence _____________
are _____________
from one atom to another
loses
+
cation – atom __________
electrons to become ______
charged
gains
anion - atom __________
electrons to become ______
charged
crystal
lattice
In ionic compounds the ions are arranged in a ___________
___________.
Strong
__________
forces hold the ions together.
Properties of ionic compounds:
melting
boiling
 high ____________
and ___________
points
hard
crushed
 ___________
- not easily ______________
conduct
melted
 _____________
electricity when ___________
or
dissolved
move
______________
because the ions are free to __________.
electrons
shared
covalent bond - ______________
are _____________,
forming
molecules
_______________.
weaker
Covalent compounds have ____________
forces holding the
molecules
_____________
together.
Properties of covalent compounds:
boiling
melting
• lower ____________
and ___________
points
volatile
• Many covalent compounds are _____________
liquids or gases.
soft
crush
• ____________–
easier to ___________
conductors
• are not ________________
of electricity
attraction
electronegativity - property that tells how strong an atom’s ____________
electrons
is for _____________.
higher
Since oxygen has a ______________
electronegativity than hydrogen, oxygen
tighter
partial
holds onto shared electrons ____________,
giving the oxygen a __________
positive
negative charge and the hydrogen a partial _____________
charge.
CHEMISTRY: A Study of Matter
© 2004, GPB
5.1
polar covalent bonds:
unequally
• electrons are shared _________________,
creating partially charged ends
poles
or __________.
nonpolar covalent bonds:
equally
• electrons are shared ________________
because atoms have the same
electronegativities
Electonegativity difference:
greater than or equal to 1.7
between 1.7 and 0.3
Type of Bond
ionic bond
polar covalent
less than or equal to 0.3
non polar covalent
Examples: Mg and F?
Mg is 1.2 and F is 4.0
S and O?
S is 2.5 and O is 3.5
3.5 - 2.5 = 1.0 Polar Covalent
4.0-1.2= 2.8 Ionic Bond
Program 501, problem set 1:
Li and Cl C and O Na and C Cl and Br S and H -
ionic bond
polar covalent
ionic bond
non polar covalent
polar covalent
metallic bond –
delocalized
electrons are ________________
sea of ___________”)
electrons
(creates a “____
properties of metals:
1. malleable
2. luster
3. ductile
4. conductors
The Chemistry Quiz
A.
CR1._____
B.
CR2._____
A.
3._____
B.
1._____
B.
4._____
CHEMISTRY: A Study of Matter
© 2004, GPB
5.2
A.
2._____
D.
5._____