Bare Bones of Bonds
This is an attractive force that holds atoms together
a bond
What do you have to do to break a bond?
You add energy
What type of ions do metals form?
What type of ions do nonmetals form?
Metals: Positive ions- cations
Nonmetals: Negative ions- anions
In what phase/s do you find molecular compounds?
Solid, liquid, or gas
Describe the structure of a metallic bonded sample at the atomic level?
positive metal ions surrounded by a "mobile sea of electrons"
What electrostatic attractions keep a bond together?
attractions of electrons on one atom for the nucleus of another
When a bond is formed, what happens to the energy?
What are the melting points and boiling points of ionic compounds?
HIGH! Because of the strong bonds
What determines the properties of molecular structures such as melting and boiling points?
The intermolecular attractions (attractions between molecules) NOT bonds
What are the melting and boiling points of metals?
The melting and boiling points are HIGH
What kind of energy is a bond?
potential energy
What silly phrase will help you remember the energy changes in bond formation?
BARF- Broken Absorbed Released Formed
To help you remember the energy changes with bond formation and breaking
What is the solubility of ionic compounds?
Soluble in water
Insoluble in organic solvents
What melting and boiling points do molecular compounds demonstrate (in general)?
The melting and boiling points tend to be low
Why are metals good electrical conductors?
The sea of mobile electrons, moving through the entire sample, allows electrical conduction.
What are the three things that can happen with electrons to form a bond
electrons can be shared, transferred, or float in a "sea of mobile electrons"
All elements strive to be like elements in which group?
Group 18
This term describes ionic compounds dissolving in water?
Dissociation
Which solvent/s dissolve molecular compounds and which do not?
Molecular compounds tend to dissolve in organic solvents,
and tend not to dissolve in water
In which solvent/s are metals soluble?
Insoluble in both water and organic solvents.
What is the driving force for a bond to form?
When two isolated hydrogen atoms form the molecule H2, what happens to the energy?
Energy is released because forming a bond is a lower potential energy state.
What happens to electrons when an ionic bond forms?
Electrons are transferred
Network solids have properties that are most similar to which other bonding type?
ionic compounds-
even though there is covalent bonding throughout!
Identify the following as ionic, molecular, network solid, or metal.
Higher melting point
dissolves in water
solid does not conduct
This is ionic.