Gen Chem Mid-term Part 2
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41 Terms
The temperature and pressure above which a supercritical fluid exists.
Define critical point.
I > III > II
Place the following compounds in order of decreasing strength of intermolecular forces.
I. CH3CH2CH2CH2CH2CH3 II. (CH3)3CCH3 III. (CH3)3CCH2CH3
12.3 kJ
Ethyl chloride, C2H5Cl, is used as a local anesthetic. It works by cooling tissue as it vaporizes; its heat of vaporization is 26.4 kJ/mol. How much heat could be removed by 30.0 g of ethyl chloride?
molecular solid
Identify the type of solid for ice.
destructive interference.
When two waves interact with the crests of one aligning with the troughs of the other is called
barium chloride
Identify the compound that has fluorite structure.
dispersion
Identify the major force between molecules of pentane.
0.904
A solution is prepared by dissolving 19.9 g of benzene (C6H6) in 282 g of carbon tetrachloride (CCl4). The concentration of benzene in this solution is ________ molal.
4.02 × 10-2 mol NaI
How many moles of NaI are contained in 244 mL of 0.135 m NaI solution? The density of the solution is 1.22 g/mL.
Carbon
Identify the element that is the BEST insulator
The rate of the reaction is proportional to the square of the concentration of the reactant.
Give the characteristic of a second-order reaction having only one reactant.
The half-life of a first-order reaction is dependent on the initial concentration of reactant.
Which of the following statements is FALSE?
1.3 s
The rate constant for a first-order reaction is 0.54 s-1. What is the half-life of this reaction if the initial concentration is 0.33 M?
The rate of reaction will increase by a factor of 4.
Given the following rate law, how does the rate of reaction change if the concentration of Y is doubled?
Rate = k[X][Y]2
18.1 kJ of heat are released.
The heat of vaporization of water at 100°C is 40.66 kJ/mol. Calculate the quantity of heat that is absorbed/released when 8.00 g of steam condenses to liquid water at 100°C.
CO2
Which of the following forms a molecular solid?
6
Give the coordination number for a simple cubic cell.
1.11 × 10-4
The Henry's law constant for helium gas in water at 30°C is 3.70 × 10-4 M/atm. When the partial pressure of helium above a sample of water is 0.300 atm, the concentration of helium in the water is ________ M.
surface tension
In a liquid, the energy required to increase the surface of the area by a unit amount is called
18.1 kJ of heat are released.
The heat of vaporization of water at 100°C is 40.66 kJ/mol. Calculate the quantity of heat that is absorbed/released when 8.00 g of steam condenses to liquid water at 100°C.
molarity
Which of the following concentration units is temperature dependent?
240 mL
What volume of a 0.716 M KBr solution is needed to provide 20.5 g of KBr?
The half-life of a second-order reaction is not dependent on concentration.
Which of the following statements is FALSE?
CFC-115
Identify the CFC with the longest atmospheric lifetime.
Rate = -1/2 deltaSO2/ Dt
Given the following balanced equation, determine the rate of reaction with respect to [SO2].
2 SO2(g) + O2(g) → 2 SO3(g)
constructive interference.
When two waves interact with their crests and troughs in alignment is called
polyurethane
Identify the condensation polymer.
2nd order
What is the overall order of the following reaction, given the rate law?
NO(g) + O3(g) → NO2(g) + O2(g) Rate = k[NO][O3]
5.20 mol/min
The decomposition of dinitrogen pentoxide is described by the following chemical equation
2 N2O5(g) → 4 NO2(g) + O2(g)
If the rate of appearance of O2 is equal to 2.60 mol/min at a particular moment, what is the rate of disappearance of N2O5 at that moment?
x-ray diffraction
Identify the technique that determines the arrangement of atoms and measures the distance between them.
all of the above
Identify the colligative property.
dipole-dipole
Give the major force between acetone and chloroform.
reaction
In the hydrogenation of double bonds, a catalyst is needed. In the third step, the reactants react to form the product. This step is known as
Rate = k[A][B][C]
Which rate law has a molecularity of three?
0.065
The rate of disappearance of HBr in the gas phase reaction
2 HBr(g) → H2(g) + Br2(g)
is 0.130 M s-1 at 150°C. The rate of appearance of Br2 is ________ M s-1.
2.70 × 104
The isomerization of methylisonitrile to acetonitrile CH3NC(g) → CH3CN(g) is first order in CH3NC. The rate constant for the reaction is 2.57 × 10-5 s-1 at 463 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is ___
A gas becomes a liquid.
Define condensation.
lead
Identify the element with the smallest band gap.
The solubility of a solid is highly dependent on temperature.
Which of the following statements is generally TRUE?
0.468 m
Calculate the molality of a solution formed by dissolving 31.3 g of LiI in 500.0 mL of water.
0.00841
Calculate the mole fraction of CaCl2 in an aqueous solution prepared by dissolving 0.400 moles of CaCl2 in 850.0 g of water.