On Target? Do this on your
Warm Up worksheet!
Why do atoms need to bond? Include the terms
valence, electrons, shell, and atom
For today
1. Warmup
2. Chemical Bonds
3. Quiz
Objective: I can explain the 3 different types of
bonds by describing how electrons are shared.
Announcement #1:
FRESHMAN CLASS MEETING ON THURSDAY,
FEBRUARY 25TH IN MS. SHERWOOD’S ROOM
(204) AT 2:20!
Semester Grades
• There was a problem in Skyward, so for some of your
the grades on your report card are different than
what your grades actually are on your transcripts!
• The ones that were different have been fixed, and if
they did change you will be sent a new report card.
• Most changes should be a positive one, meaning your
grade should go up!
• Some had a large difference, and others were a
smaller difference-depending on how well you did on
the final
• If you want to see what your grade is, see Ms.
Benson/Ms. Klopfer in the attendance office and they
can print off a transcript for you
Final!
• Presentation, model and group grades are all out of 100
points each
• Presentation grades were calculated to be made up of ¾ of
your actual presentation and ¼ check-in and turning in on
time with Ms. G
• Presentation and model grades multiplied in Skyward to be
out of 450 points each
• Total with all 3 grades together in skyward was 1000 points
• The guest judges gave comments, but their imput did not
affect your grade. My rubric has your grade in it, and I
graded in red ink. Model grades are on the back!
• Models and user guides are ready to be picked up! If you
don’t see yours, it’s in the library on display or I am keeping
it for future examples (if you want it back, talk to me!)
EXPLORE: Particular Properties
Particle (Atom)
electron
negative(-)
neutron
neutral
proton
positive(+)
Why do atoms need to bond?
• Valence electrons (outer shell)
• Atoms are most stable with a full outer shell (8
electrons)
Objective: I can explain the 3 different types of bonds by
describing how electrons are shared.
3 types of bond
• Ionic
• Polar covalent
• Covalent
What is the difference between these bonds?
Objective: I can explain the 3 different types of bonds by
describing how electrons are shared.
Ionic bonds: Electron transferred
• What are these?
Makes separate
charged particles
called IONS
Polar Covalent Bonds
• Sharing electrons but unequally
Means partial
charge
Makes one
particle with
both charges
Electrons pulled
more toward
oxygen than
hydrogen
Covalent bonds
• Sharing electrons equally
Makes one
particle with no
charge
Categories on data table!
• What type of bond is table salt?
– What other substances share properties with
salt?
• What type of bond is sugar/glucose?
– What else shares these properties?
Summary questions
• What is the charge on unbonded atoms?
• The charge on unbonded atoms is _______
• Why does chlorine have a negative charge when
ionically bonded to sodium?
• Chlorine has a negative charge when ionically
bonded to sodium because
______________________
WHY DOES SALT NOT CONDUCT ELECTRICITY
AS A SOLID BUT DOES IN SOLUTION?
WHY DOES SALT NOT CONDUCT ELECTRICITY AS A
SOLID BUT DOES IN SOLUTION?
IONS CAN MOVE!!
How is that related to conducting
electricity?
SUMMARY
In a conductor, charged particles called
ions (+ or – charge) are moving in an
electrical current. For example, salt water
must have ions moving between the
prongs conducting electricity and so
completing the circuit, lighting the LED
lights.
Sugar in water is a insulator because ions
do not move so no electricity is conducted.
QUIZ!
• Need to be quiet until EVERYBODY is done
• Eyes on your own paper
• When you finish, you may:
–
–
–
–
Silently read
Work on homework from another class
Draw
Any other independent, quiet activity
• You may not:
– Talk
– Leave your seat without permission
Why these different types of Bonds?
• Electronegativity: How much an atom can pull
electrons
Like a tug-of-war. If they are equally matched, they
share the electrons equally. If one is way stronger,
it can pull electrons away from another atom.