The solubility of nitrogen gas in 50 degree water compared with the solubility of nitrogen gas in 10 degree water.
What is less soluble.
100
The colligative properties for vapor pressure, boiling point and freezing point.
What are vp lowering, bp elevation, and fp depression.
100
The reason that a greater surface area increases the rate of reaction that involves a solid reactant.
What is there are more places for collisions to occur.
100
True or False - The rate constant increases as reactant concentration increases.
What is false.
100
The term to describe a solution that contains some bits of undissolved solute.
What is saturated.
200
An endothermic process that occurs as a solute dissolves in a solvent.
What is breaking bonds within the solute or solvent.
200
The boiling point of 0.500 molal urea in chloroform. The Kbp for chloroform is 5.02 degrees C/molal and the normal bp for chloroform is 61.2 degrees C.
What is 63.7 degrees C.
200
The two requirements for a successful collision which is one that leads to products.
What are enough energy (the activation energy) and the correct orientation.
200
The rate law for a second order reaction having a single reactant.
What is rate = k[reactant]^2.
200
A chemical species that is produced in an early step of a mechanism and used up in a later step.
What is an intermediate.
300
A saturated NaCl solution contains 36 g NaCl per 100 g of water. Therefore an NaCl solution that contains 15 g dissolved NaCl in 46 g of water is described by this term.
What is unsaturated.
300
The correct ranking from highest fp to lowest fp for these solutions:
A. 0.20 molal NaCl(aq)
B. 0.10 molal CaCl2 (aq)
C. 0.10 molal K2SO4 (aq)
D. 0.20 molal I2 (aq)
What is D > B ~ C > A
300
The main reason why the reaction rate increases as temperature increases in terms of the collision theory.
What is the collisions have more energy and therefore more collisions have the activation energy.
300
The factor by which the rate changes when the concentration of "A" is tripled given the rate law, rate = k[A]^2[B].
What is increases 3^2 = 9 times.
300
True or False, colligative properties of an ideal solution depend on the type of dissolved solute.
What is False
400
The equation for the dissociation of Na3PO4 in water.
What is Na3PO4 --> 3 Na+ + PO4(3-)
400
The vapor pressure of a solution consisting of 0.50 mole of NaCl in 10.0 moles of water. Assume the solution is ideal and the vapor pressure of pure water at this temperature is 500 torr.
What is 455 torr.
400
Interpretion of the graphs of fraction of molecules vs energy yields this reaction as the faster one.
What is the one with the lowest Eact.
400
The rate law for the elementary reaction:
CH3Cl + I- --> CH3I + Cl-
What is Rate= k[CH3Cl][I]
400
The rate of disappearance of O2 when the rate of appearance of CO2 is 0.60 M/sec for the reaction:
C2H4(g) + 3 O2(g) --> 2 CO2(g) + 2 H2O(g)
What is 0.90 M/sec.
500
The reason why KBr is highly soluble in water at room temperature even though the enthalpy change for dissolving KBr is highly endothermic.
What is dissolving an ionic compound in water results in a large increase in entropy which favors dissolution.
500
The molar mass of a molecular compound whose benzene solution freezes at 3.9 degrees. This solution consists of 5.00 grams of compound in 110 grams of benzene. The normal fp of benzene is 5.5 degrees C and the Kfp for benzene is 5.12.
What is 145 g/mole or 150 g/mole.
500
A sketch of a reaction that occurs in a two step mechanism having an enthalpy change of -20 kJ, an overall Eact of 100 kJ, and a slower first step than second step.
What is see board.
500
The rate law, including k and its units, for the reaction. Initial molarities and initial rates are given.
3 A + 2 B ---> D + E + 2F
0.20 0.20 rate = 0.0062
0.40 0.20 rate = 0.050
0.40 0.40 rate = 0.10
What is rate = 3.9(1/M^3 sec) [A]^3[B]
500
One should make this conclusion about the rate law when the plot of reactant concentration vs time produces a linear graph with a negative slope.
What is the order with respect to the reactant is zero.