Lewis Structures
What is the Lewis Structure of CO2
include: total # of valence electrons, electron group geometry, molecular shape, and polarity
Valence Electrons: 16
Electron Group Geometry: Linear
Molecular Shape: Linear
Polarity: non-polar
How many moles of water (H2O) are in 36 grams of water?
2 moles H2O
__H2+__O2→__H2O
2 H2 + O2 → 2 H2O
What is the chemical formular for Iron (III) Oxide?
Fe2O3
What is the predicted bond angle of the following:
EGG = Electron Group Geometry; MS = Molecular Shape)
1. EGG Trigonal Planar, MS Trigonal Planar
2. EGG Trigonal Planar, MS Bent
3. EGG Tetrahedral, MS Trigonal Pyramidal
1. 120 degrees
2. 120 degrees
3. 109 degrees
What is the Lewis Structure of COCl2
include: total # of valence electrons, electron group geometry, molecular shape, and polarity
Valence Electrons: 24
Electron Geometry: Trigonal Planar
Molecular Shape: Trigonal Planar
Polarity: Polar
How many molecules are in 0.25 moles of CO2?
1.51 x 10^23 molecules CO2
__Na+__Cl2→__NaCl
2 Na + Cl2 → 2 NaCl
What is the chemical formular for the compound formed between calcium and phosphate?
Ca3(PO4)2
For each of the following bonds, state whether the bond is ionic, polar, or nonpolar:
1. H-Cl
2. O-O
3. N-F
4. Na-Cl
1. POLAR (3.0 - 2.1 = 0.9)
2. NONPOLAR (EN difference = 0)
3. POLAR (4.0 - 3.0 = 1.0)
4. IONIC (3.0 - 0.9 = 2.1)
What is the Lewis Structure of CCl2F2?
include: total # of valence electrons, electron group geometry, molecular shape, and polarity
Molecular Shape = Tetrahedral
Polarity: Polar
How many moles of H₂ are needed to completely react with 0.750 moles of O₂ based on the reaction below?
2 H2 + O2 → 2 H20
1.50 moles of H2
__Al+__O2→__Al2O3
4 Al + 3 O2 → 2 Al2O3
What is the chemical formular for Copper (II) Nitrate?
Cu(NO3)2
Which element is oxidized and which is reduced?
Zn + Cu^2+ → Zn^2+ + Cu
Cu^2+ is reduced (gains 2 electrons)
What is the Lewis Structure of CH3OH?
include: total # of valence electrons, electron group geometry and molecular shape of each central atom, and polarity
Valence Electrons: 14
Electron Geometry: Tetrahedral (C and O)
Molecular Shape: Tetrahedral (C) and Bent (O)
Polarity: Polar
How many hydrogen atoms are present in 0.0450 moles of C6H12O6?
3.25 x 10^23 H atoms
__C3H8+__O2→__CO2+__H2O
C3H8 + 5 O2 → 3 CO2 + 4 H2O
What is the name of SF6?
Sulfur Hexafluoride
Classify Each Reaction as Combination, Decomposition, Combustion, and Single Replacement:
1. 2 H2 + O2 → 2 H2O
2. CaCO3 → CaO + CO2
3. CH4 + 2 O2 → CO2 + 2 H2O
4. Zn + 2 HCl → ZnCl2 + H2
1. Combination (2 reactants combine to form 1 product)
2. Decomposition (One compound breaks down into 2 products)
3. Combustion (Products are CO2 and H2O)
4. Single Replacement (Zn replaces H)
What is the Lewis Structure of CH3NH2
include: total # of valence electrons, electron group geometry and molecular shape of each central atom, and polarity
Valence Electrons = 14
Electron Geometry = Tetrahedral (C and N)
Molecular Shape = Tetrahedral (C) and Trigonal Planar (N)
Polarity: Polar
How many moles of Al are needed to completely react with 0.850 moles of Fe2O3 based on the reaction below?
2 Al + Fe2O3 → 2 Fe + Al2O3
1.70 moles of Al
__Fe2O3+__C→__Fe+__CO2
2 Fe2O3 + 3 C → 4 Fe + 3 CO2
What is the chemical formula for dinitorgen tetroxide?
N2O4
For each pair of molecules, identify which has the stronger intermolecular forces and explain why:
1. CH2O vs CH2OH
2. CH3CH3 vs CH3OH
3. HF vs HCl
4. CO2 vs CO
1. CH2OH due to Hydrogen Bonding
2. CH3OH due to Hydrogen Bonding
3. HF because of Hydrogen Bonding and has a bigger EN difference
4. CO because it is polar (dipole-dipole)