science
consider the reaction A + 2B --> C + 3D. If the initial rate of formation of C is ^[c]/ ^t = 1.0 M/h, which of the following is correct
- ^[B] / ^t = 2.0 M / h
assume that all states are those that are listed below:
-1528.2 kJ
determine ^H for this reaction for 1.00 mole of hydrogen gas being produced, given ^H [H20]= -286 kJ/ mol and ^H [Na0H]= -470 kJ/mol
-368 kJ
the standard heat of formation of Co2 is closest to:
-390 kj/ mol
if the specific hear of kerosene is 2.0 J/g C what is the specific heat of the metal
1.5 J/g C
what would the rate of formation of NO be in M/s if [NO]=0.20M and [02]= 0.20M
2.0 x 10-3
which of the following reactions is not thermodynamically favored at low temps but becomes favorable as the temp increases
2H20 --> 2H2 + 02
which of the following expressions to equivalent to the ^H for the reaction
2w + x + 2y + 2s
approximately how long did it take for 75% of the initial amount of C25 H30 N3 to react
300 s
how much heat is absorbed or released when 0.050 moles of Cl2 are formed from KCl
43.7 kj is absorbed
which of the following best describes the flow of heat when 1.0 mol of XY2 decomposes
50 kJ of heat is transferred from the surroundings
the reaction is first studied with [M] = [N] = 1.0 x 10-3 M. if a new experiment is conducted with [M]=[N]= 2.0 x 10-3, the overall reaction rate will increase by a factor of
8
which of the following diagrams best represents the change in energy as the reaction represented below proceeds
A. (H2 + Cl2 up 190)
which metal has the highest specific heat
Al
Which letter represents the activation energy forward reaction
B
which of the following reaction energy profiles corresponds to the proposed mechanism
B
if a catalyst were added what part(s) would change?
B and C
which of the following equations represents a reaction for which the standard entropy change is positive
CaCo3 --> Ca0 + C02
which of the following graphs shows the speed distribution of the same molecule at a lower temp
D
which of the following is true regarding the relative rates of appearance and disappearance for the reaction 2NO + 2H2 --> N2 + 2H20
II and III only
what would be the units of the rate constant, k , for the reaction above
M-2 s-1
two step mechanism for the reaction the first step is slow and the second step is fast
NO2 + F2 --> NO2F
the initial rate data in the table above were obtained for the reaction represented below. what is the rate law for the reach 2NO2 + 02 ----> NO2
Rate= k[N0][02]2
in trial 2 which of the reactants would be consumed more rapidly and why
Y, bc the rate of disappearance will be double that of X
which of the following best explains the observation
a high activation energy makes the forward reaction extremely slow at 298 k
which of the following best helps explain why increased in temp increases the rate of chemical reaction
at higher temp, high ----- collisions happen more frequently
the reaction is thermodynamically favorable under standard conditions at 298 K. therefore the ^S means the reaction must be
greater than ^H / 298 K
what would be the effect on the reaction rate if the solution of C25 H30 N3 is diluted by a factor of two
it would be lower
which of the following rate laws for the overall reaction corresponds to the proposed mechanism
rate= k[Cl][03]
which of the following rate expressions agrees best with this possible mechanism
rate= k[NO]2
which of the following is true regarding the forces between the atoms when their internuclear distance is x
the attractive and repulsive forces are balanced, so the atoms will maintain an average internuclear distance x
which of the following correctly describes the reaction
the decomposition of N2 05 is a first order reaction
which of the following statements is true about bond energies in this reaction
the energy absorbed as the bonds in the reactants are broken is less than the energy released as the bonds in the product are formed
which of the following most likely accounts for the difference between reaction path one and reaction path two
the presence of a catalyst in path two
for the reaction A + B --> C the rate law is rate = k[A]. if the temperature is increased which of the following will be true
the rate of the reaction and the rate constant will increase
for the reaction A + B --> C the rate law is rate = k[A]. if the concentration of A is increased which of the following will be true
the rate of the reaction will increase and the rate constant will not change
which of the following is a true statement about the thermodynamic favorability of the reaction
the reaction is favorable and driven by an enthalpy change only
which of the following statements is a correct interpretation of the data regarding how the order of the reaction can be determined
the reaction is first order if the plot of ln[H202] versus time is a straight line
which of the following statements can be correctly concluded from the data
the temp change of the metal was greater than the temp change of the water but bc the final temp of the metal and water were the same, the total amount of thermal energy transferred was equal
which of the values of ^H for a process in the table is less than zero
y and z only