Exam 1 review
Balance the following equation and then find the number of moles of O2 is required to make 0.5 moles of cyclohexanone
C6H10O + O2 -> CO2 + H2O
C6H10O + 8O2 -> 6CO2+5H2O
(.5 mol C6H10O *8 O2 Mol)/1 mol of C6H10O
= 4 mol of O2
BONUS: How many grams of water is produced from 0.5 mol of cyclohexanone?
Which are the correct nomenclature?
a) Cuprous (I) Dioxide
b) mercury (I) dioxide
c) ammonia perchlorate
d) cobalt (II) hydride
e) iron sulfite
d) cobalt (II) hydride
BONUS why were the others wrong?
Which of the following is an endothermic process?
a) H20 (g) -> H20 (s)
b) H20 (s) -> H20 (l)
c) Cl(g) -> Cl+(g) + e-
d) CH4(g)+2O2(g)->CO2(g)+2H2O(l)
e) Cl(g) +e- ->Cl-(g)
B and E
Compare the bond energies and bond lengths of C-C single, double, and triple bonds
single - lowest BE and longest BL
triple - highest BE and shortest BL
second in between for both
What neutral atom satisfies the following?
-contains 3 unpaired electrons in the ground state
-forms a stable gaseous diatomic molecule
Nitrogen
true or false and explain why
the mass of one CO2 molecule is 44g
False
one mole is 44g
one molecule is 44 amu
Balance the following,
sulfuric acid reacts with sodium hydrogen carbonate to produce sodium sulfate, water, and carbon dioxide.
do not forget to add states of matter
H2SO4 (aq) + 2NaHCO3 (aq) -> Na2SO4(aq)+ 2H2O(l)+ 2CO2(g)
What is the quantum numbers and condensed electron configuration of Co+3
(3,2,2,-1/2)
[Ar] 4s1 3d5
A nuclide decays by eliminating 2 alpha particles and a positron. Then it is bombarded by a Li-6 nuclide which creates a Pb-207 nuclide. What was the OG nuclide?
Po-209
What AB3 molecule satisfies the following
can exist as AB3 or AB5
is polar at AB3 and NP at AB5
AB3 angle is less than 109
B and A in the same period on PT
PCl3
A molecule has the empirical formula C3H7, and has the density of 3.844 g/L at STP.
What's the molecular compound of the gas?
Hint: PM=dRT
PM=dRT -> 1(M)=(3.844)(0.08206)(273)
M=86.11 g/mol. And C3H7 MM=43
86.11/43 =~2
C6H14
How many grams of Na2SO4-10H2O (s) contain 5.78*10^25 oxygen atoms
(5.78*10^25 O atoms * 1 mol O*1 mol solid*332.1g)/ (A#*14 mol O*1 mol of solid) =
2208g
Calculate the heat of the combustion reaction of C6H14
Delta H of F : C6H14 (-180.1 kJ), H2O (-286.299 kJ), CO2 (-393.5 kJ)
Products - Reactants
-4185 kJ
The atomic mass of Cl-35 is 34.9689 amu, and the atomic mass of Cl-37 is 36.9659 amu.
Calculate the abundance of Cl-37
1-x(34.9689)+x(36.9659)=35.45
x=24.1%
What do the following species have in common
NO2- N2O CO3-2
A) nonpolar, all are anions
B) all contain ionic bonds, all violate the octet rule
c) all have dipole-dipole forces
d) all have resonance structures and LD forces
d) all have resonance structures and LD forces
What is the mass of 12 dichloride heptoxide molecules in amu? In grams?
2184 amu
3.63*10^-21 g
Balance the combustion reaction of C6H14 and find the amount of moles of CO2 gas are produced if 7 water molecules are produced.
2C6H14 + 19H2O -> 12CO2 + 14 H2O
6 moles of CO2
If 50. ml of .20 M HCl are mixed with 50. mL of .20 M NaOH, each with the initially at 22.2C, what is the final temp of the solution if the heat of neutralization is -56 kJ/mol. (Assume density is 1.0g/mL)
22-23 degrees C
q=mcAT
-56=(100)(Tf-22.2)(4.184)
What is the polarity of XeF4?
NP - square planar
If O2 +4 existed, compare the electronic properties (bonding) of this ion to those of O2 +2.
O2 +2 -> diamagnetic, BO 3, lower BL, higher BE
O2 +4 -> para, BO 2, longer BL, lower BE
A student obtained 5.82g of sodium sulfate from the reaction and the percent yield was 82.0%. How many grams of sodium hydrogen carbonate did the student use?
H2SO4 + NaHCO3 -> Na2SO4 +H20+CO2
8.39g
If equal mass of C2H2, C2H4, C2H6 are placed in a sealed container, which gas has....
the highest partial pressure?
the highest average KE?
the highest root-mean-square velocity?
C2H2
all of them
C2H2
A 31.1 g of gold (69.3C), is submerged into 75.8g of water(21.8C) in an insulated container. What is the final temp at equilibrium?
specific heat of Au is 0.128 J/g
-qmcAT=qmcAT
-31.1(.128)(Tf-69.3)=75.8(Tf-21.8)(4.184)
Tf=22.40 C
What is the hybridization of CSO? Is it polar or nonpolar?
sp, polar
Which has a higher bond energy CN- or CN+? Which has the longer bond length?
CN+ : lower BE and higher BL