CHEM 219 Final Exam Questions And Answers 2024/2025
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Course
CHEM 219 2024/20
Institution
CHEM 219 2024/20
CHEM 219 Final Exam Questions
And Answers 2024/2025
What is the difference between effusion and diffusion? - ANSEffusion is through a pinhole, and diffusion is through open space.
Under what conditions are gases most likely to behave ideally? -
ANS-Gases are more likely to behave as ideal ga...
CHEM 219 Final Exam Questions
And Answers 2024/2025
What is the difference between effusion and diffusion? - ANS-
Effusion is through a pinhole, and diffusion is through open space.
Under what conditions are gases most likely to behave ideally? -
ANS-Gases are more likely to behave as ideal gases at low
pressures and high temperatures. Particles are moving faster and
are farther apart, therefore they are less likely to interact with each
other
The phrase 'like dissolves like' refers to - ANS-"Like dissolves like"
refers to the fact that polar molecules dissolve polar molecules,
which both have polar and perhaps hydrogen bonding
intermolecular forces, while nonpolar molecules dissolve nonpolar
molecules, which generally only have dispersion intermolecular
forces.
Which of the following factors affect the solubility of a gas in a liquid
solvent?
l. Pressure
II. Temperature
III. Identity of gas - ANS-The solubility of a gas in a liquid solvent is
dependent on the nature of the gas, the temperature and the
pressure. Generally, the solubility of a gas in a liquid solvent
increases with lower temperatures and high pressure.
Forming solution A from liquid B and liquid C is endothermic.
Increasing the pressure above the solution will - ANS-Since the
solution does not contain any gases, and since liquids are
,incompressible, then a change in pressure will have no effect on the
solution process.
Which of the following statements is true about the solubility of N₂
(g) in CH₃OH (l)? - ANS-Henry's Law states that the higher the partial
pressure of the gas, the more soluble it will be in the solvent. This is
because there are more molecules of the solute available to
dissolve in the solvent.
Hypertonic - ANS-A solution containing a higher concentration of
solutes than inside a red blood cell
Isotonic - ANS-A solution that matches the concentration of solutes
in cells
Hypotonic - ANS-A solution that contains a lower concentration of
solutes than inside the cell
Henry's Law - ANS-the solubility of a gas in a liquid is directly
proportional to the partial pressure of that gas on the surface of the
liquid
The predicted van't Hoff factor for a calcium chloride solution,
CaCl₂(aq), is - ANS-When the strong electrolyte CaCl₂ dissolves, it
breaks up into one Ca²⁺ and two Cl⁻ ions. That gives a van't Hoff
factor of 3.
At a particular temperature, the solubility of H₂ in water is 0.140 M
when the partial pressure is 1.20 atm. What partial pressure (in atm)
of H₂ would give a solubility of 4.95 M? - ANS-42.4 atm
C = kP --> c12/c1 = p2/p1
, The speed of a wave (c) is the product of its frequency (ν) and
wavelength (λ). - ANS-E = hv = h x c / λ
nm to m
or
m to nm - ANS-1 m / 10^9 nm
or
10^9 nm / 1 m
What is the maximum number of electrons that can have the
quantum numbers n = 3, ℓ = 2, mℓ = -2? - ANS-The Pauli exclusion
principle states that no two electrons in a given atom can share the
same set of four quantum numbers (n, ℓ, mℓ, ms). This set of
quantum numbers contains three quantum numbers, with the only
missing quantum number being ms, which can take on the values
+½ and -½. Therefore, this set of three quantum numbers
represents a single atomic orbital, which can contain two unique
electrons: one with ms = +½ and one with ms = -½.
An exothermic reaction causes the surroundings to - ANS-An
exothermic reaction transfers energy from the system to the
surroundings. That tells us the surroundings will get warmer.
A theory is another word for a(n) _________. - ANS-A theory or model
is a well established explanation of a phenomenon based on a
series of facts and a body of evidence.
What is the definition of a natural law? - ANS-A scientific law
summarizes an observable behavior.
The skeletal structure of a complex organic molecule is shown
below. Determine the number of sigma (σ) and pi (π) bonds in the
molecule. - ANS-Remember a single bond = 1 σ; a double bond = 1 σ
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