09/07/21

Suppose you have measured the kinetics of the reaction, 2 A + B → C + 2 D at room temperature using the method of initial rates.

A table summarizing the results of four different experimental trials is shown below: Experimental Initial A Initial B Initial rate Trial (M) (M) (M... more
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09/07/21

Suppose you have measured the kinetics of the reaction, 2 A + B → C + 2 D at room temperature using the method of initial rates.

A table summarizing the results of four different experimental trails is shown below: Experimental Initial A Initial B Initial rate Trial (M) (M) (M... more
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09/07/21

Suppose you have measured the kinetics of the reaction, 2 A + B → C.
You measure the change in the B-concentration with time and determine the rate law is second order in A and zeroth order in B and has a rate constant of k = 0.0634 M-1 s-1.  If the A-concentration... more
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09/07/21

What is the concentration at the first equivalence point?

You titrate 50.0 mL of 0.100 M H2A (a diprotic acid) with 0.250 M KOH. What is the concentration of HA- at the first equivalence point?
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09/07/21

Use heat of formation data from Appendix E to calculate the change in the standard heat of reaction for
Use heat of formation data from Appendix E to calculate the change in the standard heat of reaction for
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09/07/21

Octane + oxygen
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09/07/21

Calculate the density of a rectangular prism made of metal
Calculate the density of a rectangular prism made of metal. The dimensions of the prism are: 5cm by 4cm by 5cm. The metal has a mass of 50 grams.
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09/06/21

Use whatever data you need from the ALEKS Periodic Table to determine the identity, mass and natural abundance of the other isotope, and complete the table.
There are only two naturally-occuring stable isotopes of boron. The mass and natural abundance of one of them is listed in the table below. Use whatever data you need from the ALEKS Periodic Table... more
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09/06/21

What is the volume of hydrogen gas released when 25cm3 of 0.2 mol dm-3 hydrochloric acid reacts with 0.2 g of zinc powder?
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09/05/21

Chemistry dilutions

You’re preparing an Ouchterlony plate to test a blood sample from a crime scene to determine if it is of human origin. When diluting your samples, you plan to have the following dilutions of blood... more
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09/04/21

The reaction 2NO2 → 2NO + O2 follows second-order kinetics. At 300 °C, [NO2] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is ________ M-1s-1.
A. 0.65B. 0.81C. 0.54D. 1.2E. 0.096
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09/04/21

Suppose you have measured the kinetics of the reaction, 2 A + B → C + 2 D at room temperature using the method of initial rates.

A table summarizing the results of four different experimental trials is shown below: Experimental Initial A Initial B Initial rate Trial (M) (M) (M... more
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Expert Answers •1

09/04/21

Suppose you have measured the kinetics of the reaction, 2 A + B → C.
You measure the change in the B-concentration with time and determine the rate law is zeroth order in A and second order in B and has a rate constant of k = 0.0188 M-1 s-1.  If the A-concentration... more
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09/04/21

Find ∆H for converting 100.0 g of solid mercury at−75.0 o C to liquid mercury at 25.0 o C at a constant pressure of 1.000 atm
The enthalpy change of fusion of mercury is 2331 J mol−1 . Find ∆H for converting 100.0 g of solid mercury at−75.0 o C to liquid mercury at 25.0 o C at a constant pressure of 1.000 atm. Heat... more
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09/03/21

What data should be plotted to show that experimental concentration data fits a second-order reaction?

A. 1/[reactant] vs. timeB. ln[reactant] vs. timeC. ln(k) vs. 1/TD. ln(k) vs. EaE. [reactant] vs. time
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09/03/21

Write a balanced reaction for which the following rate relationships are true. Rate = -1/2 * Delta[N2O5]/Delta T = 1/4 * Delta[NO2]/Delta T = Delta[O2]/ Delta T
A. 1/4 NO2 + O2  →  1/2 N2O5 B. 4 NO2 + O2  →  2 N2O5C. 2 N2O5 → NO2 + 4 O2D. 2 N2O5 → 4 NO2 + O2E. 1/2 N2O5 →  1/4 NO2 + O2
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09/03/21

find vapor pressure
The normal boiling point of a liquid is 282.0 °C. What is the vapor pressure of this liquid at 161.0 °C in atm? (∆Hvap = 28.5 kJ/mol)
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09/02/21

Solve this task.

Use the Lewis symbol to show the molecule Chlorine, methane, oxygen, nitrogen, carbon dioxide and carbon monoxide
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09/02/21

What is the vapor pressure (in torr) of an aspririn solution at 85 °C, if the solution contains 872.3 g of aspirin (C9H8O4, 180.16 g/mol) in 719.3 mL of water.

The vapor pressure of pure water at 85°C is 433 torr and the density is 0.969 g/mL. Enter your value with 3 significant figures
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09/01/21

Calculate the mole fraction of phosphoric acid in a 29.1% (by mass) aqueous solution.

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09/01/21

What is the vapor pressure (in torr) of an aspririn solution at 85 °C, if the solution contains 872.3 g of aspirin (C9H8O4, 180.16 g/mol) in 719.3 mL of water.

The vapor pressure of pure water at 85°C is 433 torr and the density is 0.969 g/mL. Enter your value with 3 significant figures
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08/31/21

Given 1 inch = 2.54 cms, Convert (2 inch)2 to cm2
Given 1 inch = 2.54 cms, Convert (2 inch)2 to cm2
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08/31/21

What is the freezing point (in °C) of a glucose solution, if the solution contains 302.9 g of glucose (C6H12O6, 180.16 g/mol) in 823.2 g of water.

Some possibly useful constants for water are Kf = 1.86°C/m , Kb = 0.512°C/m, freezing point = 0°C, boiling point = 100°C, and density 0.997 g/mL. Enter your value with 2 decimals.
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08/31/21

What is the vapor pressure (in torr) of an aspririn solution at 85 °C, if the solution contains 872.3 g of aspirin (C9H8O4, 180.16 g/mol) in 719.3 mL of water.

The vapor pressure of pure water at 85°C is 433 torr and the density is 0.969 g/mL. Enter your value with 3 significant figures
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08/31/21

Calculate (a) q when a system does 54 J of work and its energy decreases by 72 J and (b) △E for a gas that releases 38 J of heat and has 102 J of work done on it?
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