Chem 106 Final WSU Questions And Expert Verified Answers
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Course
Chem 106
Institution
Chem 106
Does oxidation or reduction happen at the anode? - Correct Answer Oxidation
Strongest IM Force observed in water? - Correct Answer H bonding
Strongest IM Force observed in BF3? - Correct Answer London Dispersion b/c it is non-polar and symmetrical
Strongest IM Force in C6H14? - Corre...
Chem 106 Final WSU Questions And Expert
Verified Answers
Does oxidation or reduction happen at the anode? - Correct Answer Oxidation
Strongest IM Force observed in water? - Correct Answer H bonding
Strongest IM Force observed in BF3? - Correct Answer London Dispersion b/c it is
non-polar and symmetrical
Strongest IM Force in C6H14? - Correct Answer London Dispersion b/c non polar
Which molecular halogen has the highest boiling point?
a) F2
b) Cl2
c)I2 - Correct Answer c) I2 b/c it is the biggest molecule
Does a long chain or spherical chain have a lower boiling point? - Correct Answer
Spherical b/c it reduces surface area
How does IM Force affect surface tension? - Correct Answer The stronger the IM
Force, the greater the surface tension
How does IM Force affect viscosity? - Correct Answer The stronger the IM Force, the
greater the viscosity
What does the term "vapor pressure" mean? - Correct Answer When the liquid/gas
system is at equilibrium
The rate of evaporation = the rate of what? - Correct Answer Condensation
How is boiling point affected by vapor pressure? - Correct Answer Higher VP = lower
BP
What does the term "boiling point" mean? - Correct Answer When the vapor pressure
is equal to atmospheric pressure
The amount of energy required to vaporize a mole of a liquid substance is determined
by what? - Correct Answer Delta H of vaporization
What is the relaitoship between IM forces and delta H of vaporization? - Correct Answer
The stronger the IM force, the stronger delta H of vaporization
What equation is used to find vaporization? - Correct Answer Classius-Clapeyron
Equation
,Vapor pressure of liquid _________ when ___________ increases - Correct Answer
Increases; temperature
Vapor pressure ___________ with increasing IM Forces - Correct Answer Decreases
Define sublimination - Correct Answer Going directly from the solid to the gas phase
without going through the liquid phase
What is critical temperature? - Correct Answer The temperature, beyond which, it is
impossible to liquify a gas by composition
What s critical pressure? - Correct Answer The pressure, beyond which, it is
impossible to vaporizae a liquid by heating
What happens if you simultaneously exceed the critical temperature and critical
pressure? - Correct Answer Supercritical fluid forms
Is pentanol most soluble in H2O or ethane? - Correct Answer It is most soluble in
ethane, least soluble (compared to other chains) in H2O
Does the solubility of an alcohol in H2O increase or decrease as the hydrocarbon chain
of the alcohol increases? - Correct Answer Decrease b/c surface area increases in the
non-polar area increases - lack of physical space to interact with
Are exothermic processes spontaneous or non-spontaneous? - Correct Answer
Spontaneous
Processes that ___________ the entropy of a system are favored to occur - Correct
Answer Increase
Potential energy is ________ when entropy increases - Correct Answer Lowered
Postive delta H = endo or exo? - Correct Answer Endo
Whether something is endothermic or exothermic depends on what? - Correct Answer
Lattice energy
Factors that affect solubility: - Correct Answer Temperature and pressure
For gases, does the solubility increase or decrease as temperature increases? - Correct
Answer Decreases
What is Henry's law? - Correct Answer It relates concentration of a dissolved gas to
the pressure of the gas above the solution
, S=KP
Determine the solubility of O2 in H2O at 25 degrees Celsius, which is exposed to air at
1.0 atm. (The partial pressure of O2 in air is 0.21 atm, K of O2=1.3x10^-3 M/atm) -
Correct Answer K of O2=1.3x10^-3 M/atm
P of O2 = 1.0 atm x 0.21 atm= 0.21 atm
1.3x10^-3 x 0.21 atm = 2.7x10^-4M
What is Raoult's Law? - Correct Answer A law that states that the partial vapor
pressure of each component of an ideal mixture of liquids is equal to the vapor pressure
of the pure component multiplied by its mole fraction in the mixture.
What are examples of ideal solutions? - Correct Answer When there are IM forces
between:
-solute-solute
-solvent-solvent
-solute- solvent
What are examples of non-ideal solutions? - Correct Answer (Deviations from Raoult's
Law)
-negative deviatsions (actual Psoln is less than predicted)
-positive deviations (actual Psoln is more than predicted)
What happens when you add a solute to something? - Correct Answer The solute
lowers the freezing point and raises the boiling point
How many ions does MgBr2 have? - Correct Answer 3
Van't Hoff Factor (i) - Correct Answer (i) accounts for ion pairing
i=moles of particles in solution/moles of formula units dissolves
Osmotic pressure equation? - Correct Answer pi = MRT
What is an example of a fast reaction? - Correct Answer Combustion
What is an example of a slow reaction? - Correct Answer Oxidation of iron
What is an example of an intermediate rate reaction? - Correct Answer Bleach
oxidizing food coloring
What is the formula for average reaction rate? - Correct Answer -delta M / delta t
What are the rate constant units for a 1st order reaction? - Correct Answer k=s^-1
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