Comprehensive Makeup Exam Flashcards
Solids have a ____ shape and are not appreciably _______.
definite; compressible
If matter is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical process, it is called a(n) _______.
compound.
compound can only be separated by chemical process.
homogeneous mixture is easier to separate
A separation process that depends on differing abilities of substances to form gases is called _______.
distilation
The SI unit for mass is _______.
kilogram
Formula for density?
d= m/v
Elements in Group 6A are called?
chalcogens
Elements in Group 7A are called?
halogens
The formula of a salt is XCl₂. The X-ion in this salt has 28 electrons. The metal X is _____
Zn
Cl has a charge of -1 (times 2 for Cl₂) = -2
So X must have a +2 charge
Add 2 protons (aka atomic #)
The formula of ammonium carbonate is ________
(NH₄)₂CO₃
Molecular formula of heptane?
C₇H₁₆
What is the molecular formula for n-hexanol?
a) C₆H₁₂OH
b) C₆H₁₃OH
c) C₆H₁₄OH
d) C₇H₁₃OH
e) C₇H₁₄OH
C₆H₁₃OH
Convert 9.316 x 10⁻⁷m to nm
932 nm
What is the formula for wavelength?
c=λf
What is the speed of light? What is its variable?
c= 3x10⁸ m/s
What is the formula for energy?
E=hv
What is planck’s constant?
h= 6.626 x 10⁻³⁴
The wavelength of a photon that has an energy of 5.25 x 10⁻¹⁹J is ________ m
3.79 x 10⁻⁷
How many p-orbitals are occupied in a Ne atom?
3 p-orbitals – 1s²2s²2p⁶ – one p-subshell (3 orbitals per -subshell)
Each p-subshell has ___ p-orbitals
3
Each p-subshell can accommodate a maximum of ______ electrons
6
The p-subshell has 3 p-orbitals, each of which holds a maximum of 2 electrons, giving a maximum of 6 electrons per p-subshell.
Each s-subshell can accommodate a maximum of _____ electrons
2
Each d-subshell can accommodate a maximum of _____ electrons
10
Each d-subshell has ___ orbitals
5
The electron configuration of a ground-state Ag atom is ________
Ag and Cu are an exceptions.
[Kr] 5s¹4d¹⁰
Kr = 36 Ag = 47
What is the electron configuration for Se?
[Ar] 3d¹⁰4s²4p⁴
A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula?
C₈H₈O₂
A 22.5g sample of ammonium carbonate contains ________ mol of ammonium ions
0.468
(NH₄)₂CO₃ — Sub2 means TWO MOLES AMMONIUM
When H₂SO₂ is neutralized by NaOH in aqueous solution, the net ionic equation is ________
H⁺ (aq) + OH⁻ (aq) –> H₂O (l)
What are the spectator ions in the reaction between KOH (aq) and HNO₃ (aq)?
K⁺ and NO₃⁻
What is the molarity formula? and the units?
M=moles/volume
molarity=moles/liters
How many K⁺ moles are present in 343 mL of a 1.27 M solution of potassium phosphate?
1.31
A 31.5 mL aliquot of H₂SO₄ (aq) of unknown concentration was titrated with 0.0134 M NaOH (aq). It took 23.9 mL of the base to reach the endpoint of the titration. The concentration (M) of the acid was _______
0.0051
Distillation formula?
M₁V₁=M₂V₂
The reaction of 50 mL of N₂ gas with 150mL of H₂ gas to form ammonia will produce _______mL ammonia if pressure and temperature are constant
100
What mass (g) of NaN₃ is required to provide 40.0 L of N₂ at 25.0⁰C and 763 torr?
2NaN₃ (s) –> 2Na (s) + 3N₂ (g)
71.7
What is the conversion from atm to torr?
1 atm = 760 torr // 760 mmHg
What volume (L) of NH₃ gas at STP is produced by the complete reaction of 7.5 g of H₂O according to the following reaction?
Mg₃N₂ (s) + 6H₂O (l) –> 3Mg(OH)₂ (aq) + 2NH₃ (g)
3.1
STP:
1 mol = 22.4 L
Pressure= 1 atm
Temperature = 273 K
STP conditions?
Pressure= 1 atm
Temperature = 273 K
1 mol = 22.4 L
An ideal gas differs from a real gas in that the molecules of an ideal gas _________
have no attraction for one another
What is Charles’ Law?
V₁ V₂
—- = —-
T₁ T₂
A 3.5 L Scuba tank at 33 C was filled from a 12.0 L nitrogen tank at 27 C and 1.25 atm and a 10.8 L oxygen tank at 23 C and 1.15 atm.
What is the total pressure in the tank?
Partial pressure of Nitrogen and Oxygen?
Total Pressure = 8.04 atm
Partial Pressure:
Nitrogen= 4.286
Oxygen= 3.55
The energy of a photon that has a wavelength of 13.2 nm is _______ J
1.51 x 10⁻¹⁷ J
3x10⁸= (13.2 x 10⁻⁹)f
f=2.27 x 10¹⁶
E= (6.626 x 10⁻³⁴)(2.27 x 10¹⁶)
E=1.51 x 10⁻¹⁷ J
What is the formula for the combined gas law?
V₁P₁ V₂P₂
——- = ——
n₁T₁ n₂T₂
The pressure of a sample of CH₄ gas (6.022 g) in a 30.0 L vessel at 402 K is ______ atm.
0.413
What elements are insoluble?
S // alkali metals, NH₄, Sr, Ba, Ca
OH // alkali metals, NH₄, Sr, Ba, Ca
CO₃ // alkali metals, NH₄
PO₄ // alkali metals, NH₄
What elements are soluble?
NO₃⁻ and C₂H₃O₂ // always
Cl, Br, I // Ag, Hg, Pb
SO₄ // Sr, Ba, Ca
Constant for R
0.0821
