Vocabulary
Dot Structures
Chemical Bonds
Molecules vs. Compounds
Various
100
What is a chemical bond?
The attractive force that holds atoms or ions together.
100
_______________ is a notation showing the valence electrons surrounding the atomic symbol.
(Provide the full name as well as an example to receive full points)
Lewis Dot Structure
100
Why do bonds form?
Atoms join to form bonds so that each atom has a stable electron configuration. There are two types of chemical bonds: Ionic and Covalent.
100
A ______________ is made up of at least 2 of the same elements.
Molecule
100
List the 3 steps for my CFS (Criteria for Success) when writing formulas for Ionic Bonds.
Criteria For Success (CFS):
Write out 2 ions
Move Charges to Subscripts
Simplify when needed
200
____________ is the arrangement of atoms in a substance.
Chemical Structure
200
For the following elements, draw lewis dot structures and arrows to show the transfer of electrons:
Sodium + Chlorine
(HINT: Na is in Group 1 and Cl is in Group 7!!)
200
____________ is a bond formed by the attraction between positively charged metal ions and the electrons around them.
Metallic Bond
200
A ____________ is made up of at least 2 different elements.
Compound
200
Given the Ionic compound, Potassium Iodide, write the chemical formula.
KI
300
Define the term "bond length," and provide an example on the board.
The average distance between the nuclei of two bonded atoms.
300
For the following elements, draw lewis dot structures and arrows to show the transfer of electrons:
Potassium + Iodine
(HINT: K is in Group 1 and I is in Group 7!!)
300
Ionic, Covalent, or Metallic?
NaCl
Ionic Compound
Na = Metal
Cl = Non-Metal
300
Name some similarities between the molecules of H2O and CO2. How are the molecules different?
CO2: Cannot measure bond angle, only bond length, has 2 O's and 1 C
H2O: Can measure bond angle AND bond length, 2 H's and 1 O
Both compounds are comprised of 3 atoms
300
Given the chemical formula BaO, name the Ionic compound.
Barium Oxide
400
____________ is the angle formed by two bonds to the same atom.
Bond Angle
400
For the following elements, draw lewis dot structures and arrows to show the transfer of electrons:
Magnesium + Oxygen
(HINT: Mg is in Group 2 and O is in Group 6!!)
400
Covalent Bond
(Electrons are shared between 2 Non-Metals)
400
Given the formula SiF6, name the Covalent Bond.
Silicon Hexafluoride
400
Given the following ions and their charges, write the chemical formula.
[Al]^3+ [Cl]^-
(HINT: Use your criss-coss and simplify if needed!!)
AlCl3
500
Compare and contrast the ball and stick model with the space-filling model. List pros and cons of each on the board.
Space-filling model shows the space that an atom takes up or fills. In other words, it shows the relative size of atoms in a compound but not bond lengths. However, it does NOT show us bond angle or bond length like the ball and stick model does.
The ball and stick model shows us bond angle AND bond length, but NO relative size of atoms in the compound.
500
For the following elements, draw lewis dot structures and arrows to show the transfer of electrons:
Magnesium and Fluorine
(HINT: Mg is in Group 2 and F is in Group 7!!)
500
Construct a Venn Diagram that compares and contrasts Ionic and Covalent Bonds. In order to receive full points, you must include what happens with the electrons, what the bond occurs between, the strength of the bond, and how that bond strength will affect the melting point of the compound.
Ionic: Occurs b/w a Metal & Non-Metal, electrons are transferred, bond is weak, therefore the melting point is low
Covalent: Occurs b/w 2 Non-metals, electrons are shared, bond takes a LOT of energy to make so it is very strong, therefore the melting point is high
500
Write the Covalent Bond formula for: Triphosphorus Heptasulfide
P3S7
500
Given the following ions and their charges, write the chemical formula.
[Ca]^2+ [O]^2-
(HINT: Use your criss-coss and simplify if needed!!)
Ca2O2 = CaO