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Final Review
Final Review
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1
What is the molar mass of O
2
?
32 g/mol
16.0 g/mol
16.05 g/mol
24.02 g/mol
2
Naming
Covalent Compounds
Disodium monochloride
Disulfur dichloride
Sodium Chloride
Disulfur dicalcium
3
Balancing Chemical Equations
2FeCl3 + NaOH -> Fe(OH)3 + 3NaCl
3FeCl3 + NaOH -> 3Fe(OH)3 + NaCl
FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCl
FeCl3 + NaOH -> Fe(OH)3 + NaCl
4
Covalent Compound Formulas
C2F
CF5
C2F5
CF
5
Balancing Chemical Equations
FeO + 2C -> Fe + 2CO2
FeO + C -> Fe + CO2
2FeO + C -> 2Fe + CO2
3FeO + C -> 3Fe + CO2
6
Greater intermolecular forces between molecules result in________.
lower boiling point
higher boiling point
higher freezing point
higher melting point
7
Covalent Compound Formulas
N3I10
NI
NI10
N3I
8
London dispersion are the
weakest forces
strongest forces
9
Covalent bonds form between...
Metals and non-metals
Non-metals
Metals
Potatoes
10
Calculate the molar mass of Iron(III) Chloride
170 g
100 g
162.5 g
11
Ionic Bonds:
Share Electrons
Split Electrons
Give/Take Electrons (transfer)
12
The image below demonstrates which of the following types of chemical reactions?
combination reaction
single displacement reaction
double displacement reaction
decomposition reaction
13
Naming covalent compounds
change the ending of the second element to -ide
don't change the ending of the second element to -ide
don't add prefixes
add a prefix like mono, di, tri...
14
What is the Molecular Geometry (shape) of a CH
4
molecule?
Tetrahedral
Linear
Square
Trigonal Pyramidal
15
Balancing Chemical Equations
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
2Al + H2SO4 -> Al2(SO4)3 + H2
Al + H2SO4 -> Al2(SO4)3 + H2
2Al + 2H2SO4 -> Al2(SO4)3 + 2H2
16
What type of electron affects the molecular geometry more?
Bonded pairs
Lone pairs
17
What Effects Rates of Reactions?
Concentration
all the above
Temperature
Surface Area
18
Naming Covalent Compounds
Sulfur Pentaoxide
Sulfur Oxygen
Sulfur Trioxide
Sulfur Dioxide
19
When do Polar Covalent Bonds form?
When e-'s are transferred to the more electronegative atom
When penguins best polar bears in a battle of wits
When electrons are shared equally
When electrons are shared unequally
20
Covalent Bonds:
Give/Take Electrons
Split Electrons
Share Electrons
21
Hydrogen bonding can only occur when hydrogen bonds with what element(s)?
Bromide and Barium
Carbon, Nitrogen, Fluorine
Nitrogen, Oxygen, and Fluorine
Hydrogen
22
dipole dipole...
exists between metals because of mobile electrons
very strong dipole-dipole force between molecules that have Hydrogen
exist between polar molecules because of permanent dipoles
exists between an ion and polar molecule
23
London dispersion forces occur when molecules
have temporary dipole moments
are polar
have strong electronegativity differences
are permanent dipole
24
What is Avogardo's number and what is it equal to?
6.02 x 10-23 particles = 1 mole
6.02 x 1023 particles = 1 mole
6.02 x 1023 mole = 1 particle
6.02 x 10-23 mole = 1 particle
25
Writing Ionic Compounds: Aluminum Oxide
At2 O3
As2 O2
Al2 O3
ArO
26
Writing Ionic Compounds: Radium Chloide
Rb2 Ca2
RaCI2
CI2 Ra
Rb2 C
27
I'm a substance that speeds up chemical reactions. What am I?
Catalyst
Reactant
Enzyme
Product
28
Metallic bonds
valence e- are mobile
A mixture of elements that has metallic properties is an alloy
Sea of electrons that can conduct
All are correct
29
Covalent Compounds Properties
High melting points, high boiling points, usually solids
Good conductors for heat and electricity.
Good conductors, high malleability
Low melting points, low boiling points. poor conductors of heat/electricity
30
Types of chemical reactions that gives off heat
biothermic
physical chemistry
exothermic
endothermic
31
Potential energy diagrams
a system as reactants are converted into air.
a system as reactants are converted into energy.
a system as reactants are converted into products.
a system as reactants are converted into heat.
32
Kinetics and rates of reaction
Color spreads the same in both beakers.
Color spreads faster in hot water as particles move faster.
The crystal will not dissolve in cold water as there is not enough energy.
Color spreads slowly in hot water as particles move slowly.
33
dipole-dipole forces are
attractive forces between electrons and protons
attractive forces between molecules that have H bond to F,O,or N
attractive forces between a partial + and - charge
34
Shapes of molecules: BF
3
is......
trigonal pyramidal with angles of 104.5
trigonal planar with bond angles of 109.5
trigonal planar with bond angles of 120
trigonal pyramidal with angles of 107
35
Which compound contains ionic bonds?
SO2
CaO
NO2
CO2
36
Covalent Compound Formulas
NS2
N2S
N2S2
NS
37
What is the type of chemical reaction shown below
DECOMPOSITION
COMBUSTION
ACID BASE NEUTRALIZATION
SYNTHESIS
38
Which of the following substances contain London dispersion forces?
Zinc
Nitrogen gas
All of them
Copper chloride
39
Why is
hydrogen bonding
only possible with
hydrogen
?
it is the only atom that is the same size as an oxygen atom
it tends to form covalent bonds
its nucleus is electron deficient
it is the most electronegative element.
40
Carbon dioxide (CO
2
) has what molecular geometry?
Trigonal planar
Linear
Tetrahedral
Bent
41
When writing ionic compounds...
The anion is written first
Overall there is a charge
The cation is written first
The charges are included
42
Collision Theory states that in order to react....
particles must collide with energy ≥ the activation energy
particles must collide with energy < the activation energy
particles must collide with the walls of the container
particles must collide and bounce off each other
43
Properties of ionic compounds
solid, brittle, high melting&boiling point, dissolve in water
soft, metallic, low melting and boiling point
good conductors of electricity in the liquid state
hard, not a good conductor of electricity
44
What is the molar mass of CH
4
?
24.02 g/mol
18.0 g/mol
16.05 g/mol
32 g/mol
45
Select ALL intermolecular forces
Dipole-dipole
Covalent bonds
Hydrogen bonding
Dispersion
46
Which statement is false about collision theory
If particles collide with enough energy a reaction occurs.
As temperature increases the particles expand
higher pressure = more crowded particles
more successful collisions = faster rate of reaction.
47
label the energy diagrams of biochemical reactions including products, reactants, and activation energy?
1-products, 2-reactants, 3-energy
1-reactants, 2-energy, 3-products
1- reactants, 2-products, 3-energy
48
Which of the following molecules exhibits hydrogen bonding?
CH2O
H2
NH3
NF3
49
Intermolecular forces...
prevent electrons from falling into the nucleus
are repelling forces that keep particles apart
are attractive forces that hold particles together (between)
are attractive forces holding atoms together (within)
50
Types of Chemical Reactions: Decomposition
AB--> A+B
AB+CD--> AD+CB
A+B--> AB
51
When writing ionic compounds,
the formulas use prefixes like di, tri, tetra
the formulas must be balanced (in charge or neutral)
the formulas are always positive
the formulas are always negative
52
Intermolecular forces are ________ intramolecular forces.
stronger than
weaker than
the same as
equal in strength to
53
Metallic Bonds are
Malleable/ Ductile
Brittle/soluble
54
What is the Molecular Geometry (shape) of the molecule shown below?
Trigonal Planar
Bent
Trigonal Pyramidal
Linear
55
In chemical reactions atoms are ________ to form new substances.
rearranged
multiplied
created
destroyed
56
What occurs during
ALL
chemical reactions?
energy is stored
energy is destroyed
energy is released
energy changes
57
Double covalent bonds result in how many shared electrons?
six
two
four
eight
58
Writing Ionic Compounds: Sodium Iodide
Na1Si2
Ba3N2
SiNa
NaI
59
Ionic bonds occur between...
2 metals
2 nonmetals
A metal and a nonmetal
60
What are the units for molar mass?
grams/mole
amu
liters
grams
