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Explain the difference between emission and absorption
Absorption = the light you don't see
Emission = the light you do see
Name all of the functional groups (and pronounce them correctly)
alkane, alkene, alkyne, ether, ester, carboxylic acid, alcohol, aldehyde, ketone
Name the different IMFs from weakest to strongest.
LDF < dipole-dipole < H-bond < Ion-dipole
Explain the difference between an empirical formula and a molecular formula
Empirical - Most simplified molecule
Molecular - Actual chemical composition
Double Jeopardy:
What was titrated in your first titration in lab?
Consider the electron transition from n=3 to n=2 in a hydrogen atom.
a. Is it absorption or emission?
b. What is the change in energy (J) of this transition?
Emission
-3.03 x 10^-19 J
What is the molecular geometry of the oxygen atom? What are it's bond angles? Which functional groups are present in the molecule?
CH3CH2CH2OCH2CH3
Bent; 109.5 degrees; alkane, ether
What are the possible IMFs this molecule could form
CH3CHOHCH2CH3
LDFs, H-bond
Determine the empirical formula for a compound with the following percent composition:
15.8% carbon and 84.2% sulfur
CS2
What does it mean for something to be endothermic?
The reaction uses heat/energy
Consider the electron transition from n=2 to n=5 in a hydrogen atom.
a. Is it absorption or emission?
b. What is the change in energy (J) of this transition?
Absorption
4.58 x 10^-19 J
What is the molecular geometry of the nitrogen atom in this molecule. What are it's bond angles?
CH3CH2CH2NHCH2CH3
Trigonal pyramidal; 109.5 degrees
Classify this type of reaction, balance it, and provide the net ionic equation.
Zn (s) + CuSO4 (aq) → ZnSO4 (aq) + Cu (s)
Redox
Zn(s) + Cu(2+)(aq) -> Zn(2+)(aq) + Cu(s)
Determine the empirical formula for a compound with the following percent composition:
40.0% carbon, 6.7% hydrogen, and 53.3% oxygen
CH2O
What does it mean for something to be exothermic?
The reaction releases heat/energy
What is the wavelength (nm) of a red photon with a frequency of 4.6 x 10^14 Hz?
652 nm
What is the molecular geometry of the bolded carbon atom? What are it's bond angles? Which functional groups are present in the molecule?
COOHCH2CH2CCCH2CH2CH3
Linear, 180 degrees, carboxylic acid, alkane, alkyne
Classify and balance the following reaction. Write the net ionic equation.
HCl(aq) + K2CO3(aq) --> CO2(g) + H2O(l)
Adic/base
2HCl(aq) + K2CO3(aq) --> CO2(g) + 2KCl (aq) + H2O(l)
2H+ + CO3(-) --> CO2(g) + H2O(l)
Aluminum metal reacts with sulfuric acid according to the equation?
_Al(s) + _H2SO4(aq) -> _Al2(SO4)3(s) + _H2(g)
If 10 g of aluminum reacts with 20 g of sulfuric acid and 54.2 g of Al2(SO4)3 are collected, what is the percent yield of the reaction?
85.5%
Is the following reaction endothermic or exothermic?
_CH4(l) + _O2(g) -> CO2(g) + H2O(g)
deltaH = -818 kJ; exothermic
What is the energy (J) of a radio wave photon from the AM broadcast band (680 kHz)?
4.506 x 10^-28 J
What is the molecular geometry of the indicated carbon atom? What are it's bond angles? Which functional groups are present in the molecule?
CH3CH2CH2CHCHCH2CH2CHO
Trigonal planar; 120 degrees; alkane, alkene, aldehyde
Classify and balance the following reaction:
KI(aq) + Pb(NO3)2(aq) --> KNO3(aq) + PbI2(s)
Precipitation
2KI(aq) + Pb(NO3)2(aq) --> 2KNO3(aq) + PbI2(s)
2I+ + Pb(2-)(aq) --> PbI2(s)
Iron metal reacts with hydrochloric acid as follows:
_Fe(s) + _HCl(aq) -> _FeCl3(aq) + _H2(g)
If 35.6 g of iron reacts with excess HCl, and 98.6 g of FeCl3 are collected, what is the percent yield of the reaction?
95.7%
Is the following reaction endothermic or exothermic?
_CO2(g) + _H2O(g) -> _C2H2(g) + _O2(g)
deltaH = 240 kJ; endothermic