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The rate constant for a certain reaction is k = 1.90×10−3 s−1 . If the initial reactant concentration was 0.850 M, what will the concentration be after 15.0 minutes? A zero-order reaction has a constant rate of 2.80×10−4 M/s. If after 75.0 seconds the concentration has dropped to 9.00×10−2 M, what was the initial concentration?

A zero-order reaction has a constant rate of 2.80×10^−4M/s. If after 75.0 seconds the concentration has dropped to 9.00×10^−2M, what was the initial concentration?

Part A The rate constant for a certain reaction is k = 4.00×10−3 s−1 . If the initial reactant concentration was 0.650 M, what will the concentration be after 10.0 minutes? Express your answer with the appropriate units.

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Part B A zero-order reaction has a constant rate of 4.90×10−4M/s. If after 50.0 seconds the concentration has dropped to 9.00×10−2M, what was the initial concentration? Express your answer with the appropriate units.

Part A

The rate constant for a certain reaction is k = 1.20×10^−3 s−1 . If the initial reactant concentration was 0.700 M, what will the concentration be after 4.00 minutes?

Express your answer with the appropriate units.

Part B

A zero-order reaction has a constant rate of 1.00×10^−4M/s. If after 40.0 seconds the concentration has dropped to 1.50×10^−2M, what was the initial concentration?

Express your answer with the appropriate units.

The rate constant for the zeroth-order decomposition of NH3 on a platinum surface at 856 ∘C is 1.50×10−6 M/s. How much time is required for the concentration of NH3 to drop from 6.60×10−3 M to 1.00×10−3 M?

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The decomposition of ammonia on a platinum surface at 856 °C NH31/2 N2 + 3/2 H2 is zero order in NH3 with a rate constant of 1.50×10-6 M s-1. If the initial concentration of NH3 is 1.16×10-2 M, the concentration of NH3 will be _________M after 5.60×103 seconds have passed.

Ammonia decomposes when heated according to the equation:

The data in the table for this reaction were collected at a high temperature.

Plot ln [NH3] versus time and 1/[NH3] versus time. What is the order of this reaction with respect to NH3? Find the rate constant for the reaction from the slope.

Find the pH of a 0.2 m solution of acetic acid. Ka for aceticacid at 25 degrees C is 1.75 x 10^-5.

a.) assume ideal behavior

b.) use the Debye-Huckel Limiting Law

c.) use the davies equation

Chlorous acid, HClO2, has a dissociation constant of Ka = 1.20 *10^(-2). Assume that you have a 0.0755 m solution of this acid andcalculate the concentration of H+ cations in the solutionand degree of dissociation for a solution of theacid

(a) Assuming ideal behavior

(b) using the Debye-Huckel limiting law.

Estimate the degree of dissociation of a 0.200 m solution of nitrous acid (Ka=4*10^-4) that is also 0.500 m in the strong electrolyte BaCl_2. Calculate the degree of dissociation for the HNO₂ in pure water and in the BaCl₂ solution. Use the Debye-Huckel limiting law for the mean activity coefficient for hydrogen ion and nitrite ion. Compare your results with the degree of dissociation of the acid in the absence of other electrolytes.

mean activity coefficient of nitrous acid=0.754

mean activity coefficient of BaCl₂=0.397

Chloroacetic acid has a dissociation constant of ka =0.000138 calculate the degree of dissociation for 0.0825m solution of this acid using the Debye -Huckel limiting law 

Which of the following is a feature of a unitary system of government?

A.Each region can decide what's best for itself with minor national oversight.

B.Each region generally abides by the same laws.

How is power distributed in different forms of government?

6. Who has the power in unitary government

7. What is the main difference between federal and confederal?

8. What does the confederal government lacks?

Calculate the number of moles of solute present in 500 mL of a 0.75 M solution of magnesium chloride (MgCl2).

A two-word fragment of the first document has multiple possible entities associated with it.

Select Yes if the statement is true. Otherwise, select No.

1. yes

2. No

List three ways in which bound labor is different before 1660 than what developed after 1660 and became what we known as slavery in the US.

Compare the philosophies of liberalism republicanism and a scripticism, and give examples of

how they are reflected in the constitution of 1787

Provide examples of how both the strengths and weaknesses of the Articles of Confederation were reflected in the Constitution of 1787.

Calculate the Ka for the weak acid based on the pH when the acid is 1/4, 1/2 and 3/4 equivalence points.

1/4=3.6

1/2=4.04

3/4=4.68

Any help would be much appreciated, thank you!!!!

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Give a social/personal example of a social movement that you are passionate about.  Who are they?  What do they value?  What do they do to get their message across to society?  In your answer you must USE, DEFINE and BOLD the following concepts: social movement and ONE of the following concepts: civil disobedience, relative depravation OR resource mobilization.

What phenotypes are expected from kittens born from a dihybrid cross of 2 parents with genotypes FfBb and FfBB? What ratio of phenotypes would be expected?