Transcript Document 7500324

The 4
Types
The Name’s
Bond
That’s so
Negative
Atomic
Nirvana
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Behind the
Valence
What are two things can you say
is the same for both
Oxygen and Sulfur?
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They have the same:
Number of valence electrons (6)
Form the same ion / valence state (-2)
Reactivity in ionic bonds
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Soda ash, or sodium carbonate,
is used in glassmaking.
It is composed of sodium ions
and carbonate ions.
What is the chemical formula of
sodium carbonate?
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Na2CO3
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Which of the following are
actual compounds
and which will never form?
a) CsF b) Mg2O4 c) AlBr2 d) Li2O
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a) CsF b) Mg2O4 c) AlBr2 d) Li2O
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An Unknown metal “X”
Forms the following salts
XO
XF2
X3(PO4)2
What Family or group is
This metal in?
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Metal “X” is in the
Alkaline Earth Metals
Family
(Group 2A)
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What are the valence states
of the following?
(What ions do they form?)
Magnesium
Nitrogen
Potassium
Nitrate
Phosphate
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Magnesium: Mg+2
Nitrogen:
N-3
Potassium: K+1
Nitrate:
NO3-1
Phosphate: PO4-3
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What are the four types
of molecular bonds ?
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1. Metallic bonds
2. Ionic bonds
3. Molecular covalent bonds
4. Network covalent bonds
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When Sulfur becomes an ion
It gains/loses
_______ electrons to
become S ?
(pick one)
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It gains two electrons to become
S-2
(like oxygen above it in the
Periodic Table)
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Why are the only solids that
electricity flow through metals?
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In Metallic Bonds valence electrons are
shared by all atoms as a “sea of electrons”
that can move freely throughout the
substance.
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Silicon Carbide is used in
special saws to cut steel and
concrete.
Will it conduct electricity?
What type of bonding does
it have?
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No it will not.
Silicon carbide is made up of 2 non-metals
and has
Network Covalent Bonding
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Name the bonds from the clues:
1.
2.
3.
4.
Conducts electricity in its solid form
Conducts electricity when dissolved in water
Does not conduct when dissolved
A solid that neither conducts nor dissolves
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1. Metallic
2. Ionic
3. Molecular covalent
4. Network covalent
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Atoms lend and borrow electrons
from their _________ ________
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Atoms lend and borrow electrons
from their Valence shells
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What type of bond does
Water have
and
does Water conduct electricity?
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H2O is held together by
molecular covalent bonds
And it does not conduct
electricity
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If aluminum and oxygen combine,
what would the compound formed be?
Al__ O__
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Al2O3
Al+3 and O-2 must combine like this
O-2
Al+3
O-2
Al+3
O-2
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In an ionic bond
metals _______ electrons while
non-metals _______ electrons
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In an ionic bond
metals lend electrons while
non-metals borrow or receive electrons
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Why are chemists so interested
in an atom’s valence shell?
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Because the electrons in the Valence,
or outer shell
are those most involved with
chemical bonding.
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What is the Valence Shell?
And why are chemists
interested in it?
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It is the last or outer shell
of electrons in an atoms.
It is where chemical
reactions take place
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Identify the following elements
from their electron structure:
1s22s22p5 = ______
1s22s22p63s1 = ______
1s22s22p63s23p64s23d3 = ______
1s22s22p63s23p64s23d104p65s1 = ______
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Fluorine: F
Sodium: Na
Vanadium: V
Rubidium: Rb
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Correctly write on the board
the electron subshell configuration for
copper
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1s22s22p63s23p64s23d9
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How many core electrons does
Calcium have?
How many Valence electrons?
What is their configuration?
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How many core electrons does
Calcium have?
18 (like Argon)
How many Valence electrons?
2
What is their configuration?
4s2
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What is a
1. Cation
2. Anion
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Cation: A positively charged atom
Anion: A negatively charged atom
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What are the two things
atoms want so they can achieve
Atomic Nirvana?
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1. A full outer shell of electrons
2. Balanced electrical charges
(equal numbers of protons and electrons)
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Do all elements form compounds
to try to attain stability
and Atomic Nirvana?
Explain
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No
Noble Gasses are already balanced
And do not form compounds
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DAILY DOUBLE
The density of a substance is
related to it chemical bonding
If the density of a strange unknown
material is 12 g/cm3,
how much would a
20 cm3 block weigh?
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20 cm3 x 12 g/cm3 = 240 g
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Strontium and the hydroxide ion
combine to form a compound:
1. What are the ions formed?
2. What will be the formula of
strontium hydroxide?
3. Will it dissolve
4. Will it conduct electricity?
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1.
2.
3.
4.
The ions formed are Sr+2 and OH-1
The formula will be SrOH2
It will dissolve in water
It will conduct electricity when
dissolved
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