Welcome Back
Lets review for our test!
Lewis Dot
Diagrams
Chemical
Bonding
Energy and
Electrons
Periodic
Patterns and
Forces of
Attraction
Density,
Solubility and
other Review
200
200
200
200
200
400
400
400
400
400
600
600
600
600
600
800
800
800
800
800
1000
1000
1000
1000
1000
Bonus Question: 2000 pts





Question:
Draw a Lewis Dot Diagram for Ca
Answer
Ca symbol at the center
Ca should have 2 electrons shown as dots






Question:
Draw correct lewis dot diagrams for Cl, Al and
He
Answer
Cl should have 7 electrons as dots
Al should have 3 electrons as dots
He should have 2 electrons as dots




Question:
Draw the Lewis Dot Diagrams for the ION
form of Ca and Cl
Answer
Ca should have no dots and a +2 charge


(+20 protons and -18 electrons = +2 charge)
Cl should have 8 dots and a -1 charge

(+17 protons and -18 electrons = -1 charge)



Question:
Draw the lewis dot diagram of the Ionic bond
between Ca and Cl
Answer





All electrons by Cl (2 Cl atoms)
Cl on either side of Ca (Ca in the center)
Ca has no electrons
Cl has -1 charge
Ca has +2 charge






Question:
Draw a lewis dot diagram for the bond CO2
Electrons must be shown with correct sharing
Answer:
C in the center, 1 O on each side
Double bond with C and O, 4 electrons in
between each C and O




Question:
Does this picture show an ionic or covalent
bond?
Answer
Conduction




Question:
Does this picture
show an ionic or
covalent bond?
Answer
Radiation or
convection
depending on
answer




Question:
Draw a bond between at least 2 atoms and
label how the features in the drawing correctly
represent the bond type
Answer
Ionic Bond


Charges, brackets, electrons on non-metal
Covalent Bond

Circles to share, electrons between and arround





Question:
Describe how you can tell if a bond is polar
covalent or non-polar covalent. Use ionization
energy or electronegativity in your response.
Answer
Similar electronegativity then share
One is stronger than the other it is polar





Question:
Describe why elements in Ionic bonds steel or
lose electrons where as elements in Covalent
bonds share. Use evidence from periodic table
patterns to support your claim.
Answer
Ionic forms when electronegativities are VERY
different
Covalent form when they are somewhat similar




Question:
Most metals will ________ electrons when
forming a bond with a non-metal. (bonus 100
points if you can say why)
Answer
Lose bccause they have a weak attraction to
their electrons (low ionization energy)




Question:
What happens to the electrons of a non-metal
in an ionic bond?
Answer
Nothing, or they increase, b/c they steel the
metals electrons




Question:
What happens to Electrons transferred within
an atom, between orbital shells?
Answer
Energy is absorbed and emitted (heat and light
energy)




Question:
What happens when electrons are transferred
between atoms or ions?
Answer
A bond is broken or formed





Question:
Draw a picture of Electrons being transferred
between Calcium and water.
Answer
Calcium replaces H
O steels Ca electrrons




Question:
The ________ in the periodic table tells you
how many electron shells an atoms has.
Answer
Period or row




Question:
The group tells you __________ about an atom.
Answer
Number of Valence (outer) shell electrons





Question:
Describe how the atomic radius changes as you
move down the periodic table. (Bonus 200
points if you also describe how it changes as
you move across the periodic table, relating
protons)
Answer
Down – increases
Right – decreases (though more protons holds
electrons closer)





Question:
Describe how Ionization energy changes as you
move to the right on the periodic table AND as
you move down on the periodic table
Answer
Right – Ionization energy increases
Down – Ionization energy descreases




Question:
Describe why atoms with a lower ionization
energy are more likely to lose their electrons
while atoms with higher ionization energy are
more likely to gain electrons?
Answer
Lower ionization energy – typically have fewer
protons and more shells making the forces of
attraction less between the electrons and
protons, making them easier to lose




Question:
Why does a gas rise out of water?
Answer
Because it is less dense than water






Question:
Why do a metal and a non-metal attract to each
other if, as ions, they have full outer shells?
(Draw Na and Cl if it helps you)
Answer
They have opposite charges which are attracted
Na loses (becomes more positive)
Cl gains (becomes more negative)




Question:
Water is polar covalent, meaning it has both a
negative and a positive charge. Why does
water have a polar bond?
Answer
Oxygen is more electronegative (greater ability
to hold onto electrons) than Hydrogen




Question:
Water is polar covalent, meaning it has both a
negative and a positive charge. Why do Ionic
and polar bonds dissolve in water?
Answer
The opposite charges will attract allowing the
substance to say with the water, breaking from
it’s other charged bond, or dissolve
Question:
Explain why Hydrogen gas doesn’t dissolve in
water and then rises to the surface?
 Answer
 Rises because it is less dense
 Doesn’t dissolve because




Non-polar covalent Hydrogen gas
Polar covalent Water
Charges are not attracted to each other so nothing
stays attracted/attached




Question:
Describe how the forces of attraction within an
atom, between protons and electrons, influence the
bond that forms between atoms.
Use ionic or covalent bonds to explain
Must includes:
Ionization energy
 Electronegativity
 Electron shells
 protons

Write Down How Much Money
You Are Willing To Risk
If You get the Question write you win that money
If you get it wrong you Loss the money!
Write Down How Much Money
You Are Willing To Risk
If You get the Question write you win that money
If you get it wrong you Loss the money!