Chemistry Ch. 7
Know how to draw Lewis structures and ionic bonding
(●'◡'●)
how many double bonds are found in the molecule AsCl3?
0
Summarize the current model of metallic bonding
A sea of electrons floating around- mobile and delocalized electrons
Predict the formula unit of the ionic compound that will form from AL and CL according to the number of valence electrons
AlCl3
How are the bonding electrons arranged in a metallic bond
Atoms delocalized and shared in the whole network. They also lose electrons because they are metals
two covalent compounds
CCl4 and PO4^-3
Compare covalent ionic and metallic b....arrangement of electrons in each type
Covalent: chemical bond that involves the sharing of Electrons to form electron pairs between atoms. Ionic type of linkage formed from the electrostatic attraction between a positively charged ion in a chemical compound . They transfer . Alec: chemical bonding that arises from the electrostatic attractive force between conduction electrons and positively charged metal ions . Sea of Electrons
what makes a bond polar
Electro negativity difference
Describe the general properties of covalent ionic and metallic according to their predominant bond type
Ionic: they have high melting points crystals easily cleave or split, and good electrical conductivity when dissolved in water Covalent: not conductive, low melting points, soft in nature, naturally flexible metallic: ductile, conductive (heat and electricity), luster, malleable
Does the octet rule always refer to a stable arrangement of eight valence electrons? Explain
No hydrogen is an exception, along with some transition metals. They have to be stable and have the lowest energy.
the tendency of atoms to prefer to have eight electrons in the valence shell
Octet rule
identify the types of atoms in the following compounds and then tell whether the compounds are predominantly ionic covalent or metallic Sodium chloride Red brass magnesium bromide
Sodium chloride is ionic, red brass is metal magnesium bromide is metal
How do intermolecular forces affect the melting point of a compound
The stronger the forces are, the more energy required
explain why atoms tend to form chemical bonds
They form chemical bonds to be stable
Wh Why are the diatomic elements not found in nature as single atoms
They have to bond to stay stable, because of their high electronegativity
how are the bonding electrons arranged in a predominantly ionic bond
They transfer
What is a polyatomic ion
a charged group of covalently bonded atoms that act as a single ion
a mixture of atoms from multiple metals which have metallic properties is called an
alloy
electrostatic attractions that form between atoms
chemical bonds
bonds formed by sharing electrons
covalent bonds
mobile valence electrons in a metallic bond are said to be
delocalized
name two network covalent substances
diamond and quartz
covalent bond consisting of two shared electron pairs
double bonds
a model that explains how metal bonds bond together
electron sea model
the measure of an atom's ability to attract electrons to itself in a chemical bond is called
electronegitivity
t\f: except for the transition and inner transtion metals, the octet rule applies to all other elements
false
ratio of cations to anions needed to achieve a neutrality
formula unit
normal properties of ionic compounds
high melting points, crystals easily cleave or split, and good electrical conductivity when dissolved in water.
ions held together trhough transfer of apposite charges
ionic bond
Considering electronegativity alone, state the most probable way in which of the following atoms could attain a valence octet. K , CA , C , K R
k: loose 1, ca:lose 2 c:gain lose or share 4, Kr: Nothing
the central atom in a lewis structure is usually the atom with the
least electroneg. or most unpaired electrons
2d diagrams that show bonds between different atoms
lewis structures
metal atoms that form bonds
metallic
forms into a cystalline structure instead of forming distinct molecules
network covalent substance
an atom becomes more stable by bonding with another atom if the resulting electron configuration is more like that of what group of elements?
noble gases
atoms attain stability by having a full valence shell of electrons according to the
octet rule
unequal sharing of electrons between between atoms of two different elements
polar covalent bond
tendency of an object to form two localized regions of opposite character or charge
polarity
Although they are made of two or more atoms, ____________ often act as a single charged particles in chemical reactions and solutions
polyatomic ions
How are the bonding electrons arranged in a non-polar covalent bond
they are equally shared
How are the bonding electrons arranged in a polar covalent bond
they're unequally shared
atoms sharing three electrons
triple bonds
t\f: polar covalent bonds result when the atoms sharing the electrons have differing electronegativities
true
