Transcript Elements

1.
a.
b.
c.
Ionic Bonds are formed between?
Metal and metal
Metal and nonmetal
Metalloid and Nonmetal
2.
a.
b.
c.
Which of the following is an ionic bond?
H2O
HCl
CaCl2
1. What is another name for the groups on the
periodic table?
2. What do all the elements of the same group
have in common?
3. Why do you suppose group 1 reacts easily
with group 7?
Tuesday, December 2, 2014
1. Why will neon not usually become an ion?
2. How many valence electrons will sodium have
after it becomes an ion?
3. How many valence electrons will fluorine have
after it becomes an ion?
4. What is the connection between questions 1-3?
Monday, December 1, 2014
Identify the following as either physical or chemical change:
a. Mixing Koolaid with water.
b. The Statue of Liberty changing from copper to green
color.
c. Ice melting
d. Iron nails attracting to a magnet.
Friday, November 21, 2014
How many valence electrons do each of the following elements have?
a. Chlorine
b. Oxygen
c. Boron
d. Xenon
e. Helium
f. Magnesium
g. Bromine
h. Lithium
Lewis Dot Structures
are used to show the number of valence
electrons on the outer shell
Represented by the group number
Valence electrons represent the oxidation number
http://macro.lsu.edu/russo/Courses/1001Web/1001web/ch4notes/ch4.htm
http://commons.wikimedia.org/wiki/File:Lewis_dot_S.svg
http://pages.uoregon.edu/ch111/images/Cdot.gif
http://www.eou.edu/chemweb/molmodel/images/ndot.gif
Get out your periodic table. Draw the chart below
in your notebook.
# of Valence
Electrons
Element
Carbon
Sodium
Neon
Hydrogen
Symbol
Period
#shells
Group #
Lewis Dot
Structure
Determine the number of shells and the number of
valence electrons for:
2nd Period = 2 shells
4th Group =
4 valence
electrons
www.chem4kids.com
Get out your periodic table. Draw the chart below
in your notebook.
# of Valence
Electrons
Element
Carbon
Sodium
Neon
Hydrogen
Symbol
C
Period
#shells
2
2
Group #
14
4
Lewis Dot
Structure
Determine the number of shells and the number of
valence electrons for:
3rd Period = 3 shells
www.chem4kids.com
1st Group =
1 valence
electron
Get out your periodic table. Draw the chart below
in your notebook.
Element
Carbon
Sodium
Neon
Hydrogen
Period
#shells
C
2
2
14
Na
3
3
1
Symbol
Group #
(Oxidation)
number
# of Valence
Electrons
4
1
Lewis Dot
Structure
(Oxidation)
number
# of Valence
Electrons
Period
#shells
C
2
2
14
Sodium
Na
3
3
1
1
Neon
Ne
2
2
18
8
1
1
1
Element
Carbon
Hydrogen
Symbol
H
1
Group #
4
Lewis Dot
Structure
Electronsnegative charge
(-)
Protonspositive
charge
Neutron- neutral
charge.
Intro to Bonding
Ions- Positively or Negatively charged atoms.
Write down each element and identify if it is a Lender (L) or
Borrower (B):
Calcium
Phosphorus
Nitrogen
Oxygen
Potassium
Argon
Monday, November 24, 2014
Draw Lewis Dot structures for:
Si, N, B, Li, Be, K
EXAMPLE:
Remember:
Lewis dot structures represent electrons on outer shell.
Elements
−An element is made
of one kind of atom.
−Found on the
periodic table.
Compounds
2 or more elements combined.
Sodium Chloride
NaCl
Aluminum Oxide
Al2O3
Compound or Element?
He
Peroxide
H2O
Potassium
KCl
LET’S REVIEW
Ions- _______________
POSITIVELY
or ______________
NEGATIVELY charged atoms.
lose
Metals ______ electrons, creating a
__________
positive charge.
Nonmetals _________
electrons, creating a
gain
________________________
charge.
negative
(Review) Intro to Bonding
Ions- Positively or Negatively charged atoms.
Sometimes, the atoms
must become ions first,
before becoming a
compound.
http://images.google.com/imgres?imgurl=http://img4.sunset.com/i/2008/07/salt-word-m.jpg%3F300:300&imgrefurl=http://www.sunset.com/food-wine/fast-fresh/salt-secrets-00400000029646/&usg=__CKIvlgMh72BkELUuSrjHOs5YA34=&h=300&w=300&sz=16&hl=en&start=5&zoom=1&itbs=1&tbnid=fIRTVJopLfeZDM:&tbnh=116&tbnw=116&prev=/images%3Fq%3Dpicture%2Bof%2Bsalt%26hl%3Den%26gbv%3D2%26tbs%3Disch:1&ei=mISTTbS_C8qgtgfrwIBM
• Ionic Bonding- Forms when electrons are
transferred from one atom to another. (One atom
loses electrons while the other gains.)
• IBs- form salts (Combo of metal and nonmetal).
Characteristics of Ionic Bonds
1. Form Crystal Lattices
2. Brittle
3. High Melting and Boiling Points
(think about the salt demo)
1.
http://www4.nau.edu/meteorite/Mete orite/Images/S odium_ chloride _crysta l.png
Let’s see a few salt combinations..
KBr
November 24, 2014
http://swiftcraftymonkey.blogspot.com/2011/11/chemistry-thursday-atom.html
1.___________ and
____________ of an
atom are inside the
nucleus.
2.____________ move
around the outer
shells.
PROTONS
3. Which subatomic
particle would
determine the
reactivity of an
element?
ELECTRONS
NEUTRONS
In your notebooks, use nitrogen as
your example to write a 4 step flow
chart for how an element becomes an
ion.
Draw the Bohr Model for the element.
Identify the number of valence electrons.
Identify whether the element is a metal or nonmetal. (If
it is a metal it will lose electrons, if it is a nonmetal- it will
gain electrons.)
Add or remove electrons based on the valence electron
ratio and determine the charge.
•Ionic Bonding Worksheet
Covalent Bonding
• Form when atoms share electrons.
• Form between 2 or more nonmetals.
Group Work Guidelines
Everyone is accountable!
Group Work Assignments means that you get a
class grade for how you as a group performs.
Everytime you get into your groups, you are
expected to turn in a Work Summary Sheet.
After you finish the today’ s worksheet….
• You will make sure you and your group
members have completed All Showbie
Assignments. If a group member is not done,
but you are, your job is to help them finish.
Please be sure to label all assignments when
you post them.
http://schools.ednet.ns.ca/avrsb/712/routlejo/Chemistry/chemclassnotes/images/bonding/bohr-nacl.jpg
Group 1 elements easily
react with Group 17
elements because
together they equal the
“special number”
8
Which group do you
suppose group 2 likes to
react with?
Go over quiz:
• You will investigate the answers for at least 5
answers you got wrong. If you have less than 5
answers wrong, your job is to help your group
members who have more investigating to do.
• You will write a summary report of the 5 answers
you investigated. If you had less than 5 answers to
investigate, you will include a detailed list of the
questions you helped your group members to find
the answers for.
Monday, December 8, 2014
1.
The formula H2O
means:
a. There are 2 hydrogens
and 1 oxygen
b.There is 1 hydrogen and
2 oxygens
c.There are 2 hydrogens
and 2 oxygens
d.There is 1 hydrogen and
1 oxygen
2. The formula H2O2
means:
a. There are 2 hydrogens
and 1 oxygen
b.There is 1 hydrogen and 2
oxygens
c.There are 2 hydrogens
and 2 oxygens
d.There is 1 hydrogen and 1
oxygen
Element
vs
LET’S Review!
Atom
A substance composed of only one kind of atom – it cannot
be broken down into simpler substances by ordinary means.
The smallest particle of matter that displays the
properties
an element.
Examples: Hydrogen
H,ofOxygen
O, Aluminum Al
Tuesday, November 18
H2O
Element Symbol
Symbol which are represented by
TheElement
________________
a single uppercase letter, or represented by an
uppercase letter followed by a lowercase letter.
This tells you the types of elements in the
compound.
Chemical Formula
Have Several
Parts
H2O
LET’S Count
ELEMENTS!
How many
What
elements do
Elements do
we have total?
you=see?
1 (Hydrogen) + 1 (Oxygen)
2 Total Elements
H2O
Compound
Formula
Parts
subscript
subscript which are numbers that
The ________________
are found on the lower ________________hand
right
side of each element symbol. This tells you the
atoms
number of ________________
of this element in
the molecule. If an element symbol has no
subscript next to it, then this indicates that there
is only ________________
atom of this element
one
in the molecule.
H2O
Elements
## of
Elements
of Atoms
Atoms
What
does the
subscript
How many Oxygen
Hydrogen
2
Hydrogen
2
(2) tell us about
Oxygen
atoms do we 1have?
Hydrogen?
LET’S Count
Atoms!
We have 2
So how
many
elements.
3
Total
total
We atoms
now have
Atoms
do we
have?
to
find
how
many
each
in Hof2O
element we
have.
Let’s Practice :
COMPOUND
TOTAL
NUMBER
OF
ELEMENTS
NAMES & NUMBERS OF ATOMS OF EACH ELEMENT
As2S3
2
AlCl3
2
2
Arsenic 2 Sulfur 3
Aluminum 1 Chlorine 3
Iron 1
Iodine 2
FeI2
BaCl2
MnBr2
CaS
SrCl2
HgBr
K2S
Fe2O3
H2SO4
TOTAL ATOMS
5
4
3
COMPOUND
TOTAL
NUMBER
OF
ELEMENTS
NAMES & NUMBERS OF ATOMS OF EACH ELEMENT
As2S3
2
AlCl3
2
2
Arsenic 2 Sulfur 3
Aluminum 1 Chlorine 3
Iron 1
Iodine 2
FeI2
BaCl2
MnBr2
CaS
SrCl2
HgBr
K2S
Fe2O3
H2SO4
TOTAL ATOMS
5
4
3
Counting
Atoms
Homework
Tuesday, December 9, 2014
• Get your notebook, Ipad, and have a seat.
• Wait for my instructions.
I will be counting tardies today.