???
What are the 5 exceptions for electron configuration? 300 bonus points if you can explain why they are exceptions.
What are Cr, Mo, Cu, Ag, and Au?
What is the molecular formula of iron(III) oxide?
What is Fe2O3?
ml = -1, 0, 1
p = 1
What is name of CaCl2 · 2H2O
What is calcium chloride dihydrate?
What is the equation for percent yield?
Actual Yield/Theorectial Yield x 100
What is the mass (in kg) of 2.11 x 10^24 bromine (Br) atoms?
0.280 kg Br
atoms --> mol --> g --> kg
If a reaction is exothermic, what is happening and what is the sign for enthalpy?
Reaction is releasing heat and enthalpy is negative (-ΔH)
In an acid-base titration, what happens at the equivalence point?
The number of moles of OH- ions is equal to number of moles of H+ ions
What volume of a 2.00 M stock solution must be measured out to make 50.00 mL of a 0.500 M solution?
12.5 mL
Violet has a __ frequency and a __ wavelength than orange light.
higher, shorter
ROYGBIV
long wavelength --> short wavelength
low frequency --> high frequency
At 25.0° C, a 10.00 L vessel is filled with 7.00 atm of Gas A and 5.89 atm of Gas B. What is the mole fraction of Gas B?
0.457
XB=5.89atm/(5.89atm+7.00atm)=0.457
In the following chemical reaction, which element is the reducing agent? 2 Ag(s) + 2Cl⁻(aq) + 2 H₂O(l) → 2 AgCl(s) + H₂(g) + 2 OH⁻(aq)
Ag because it goes from 0 to +1 so it is losing electrons (oxidized).
The mass of a glass bead is recorded as 4.023 g. If the density of glass is 2.4 g/cm3, what is the volume (in mL) of the glass bead?
1.7 mL glass bead
density = mass/volume
1 mL = 1 cm3
g --> density --> mL
Find mass percent of Cl in CCl2F2
58.64%
What is the electron domain and molecular geometry of H2O?
What is tetrahedral/bent?
What is the average atomic mass of naturally occurring chlorine atoms, based on the information below?
Isotope l Natural Abundance (%) l Atomic Mass (amu)
35Cl 75.77 34.9689
37Cl 24.23 36.9659
35.45 amu
0.7577 x 34.9689
0.2423 x 36.9659
26.496 + 8.957 = 35.45
What is the noble-gas electron configuration of Sn?
What is [Kr] 5s2, 4d10, 5p2?
When solving for Standard Enthalpies of Formation, is it products - reactants or reactants - products?
Products - Reactants
What is the name of C4N3?
What is tetracarbon trinitride?
H H H H
H C C C C H
H H H H
What is the empirical formula of this structure?
C2H5
Draw the Lewis Dot Structure of CO32- with minimized formal charge and if there are resonance structures, make sure to write those out.
O
l
[O=C--O]2-
If there is 35.7 mL of 0.108 M Na2CO3, what is the volume of 0.150 M HNO3.
51.4 mL
Draw the net dipole moment for NH3 and determine if this molecule is polar or nonpolar.
What is net dipole moment pointing up towards N and it is polar?
What is the energy (in J) of the light emitted by a hydrogen atom when an electron relaxes from the n = 5 to the n = 3 state?
+1.55 x 10-19 J
E = -(2.18 x 10-18 J)(1/nf2 - 1/ni2)
ni = 5
nf = 3
E atom = -E photon
When copper metal is added to nitric acid, the following reaction takes place:
Cu (s) + 4 HNO₃ (aq) → Cu(NO₃)₂ (aq) + 2 H₂O (l) + 2 NO₂ (g)
Calculate the volume in liters of NO₂ gas collected over water at 25.0 °C when 2.01 g of Cu (s) is added to excess HNO3 if the total pressure is 726.0 mmHg. The vapor pressure of water at 25.0 °C is 23.8 mm Hg.
1.67 L
726 mmHg - 23.8 mmHg
760 mmHg = 1 atm
g Cu -> mol Cu -> mol NO2