The activation energy for a particular reaction is Ea = 13.40 kJ. What percentage of the molecules are at or above the activation energy at 500.0 K?

a 374 ml container holds 0.146g of Ne and an unknown amount of argon at 35°C total pressure =638mmHg calculate moles of Ar present

The lab name is Electrochemical Determination of entropy of mixing

Explain briefly why complementary solutions were used in this experiment. How does this experimental design effectively simulate the hypothetical reversible mixing process discussed earlier in the notes( earlier in the notes I put reversible happen infinitesimally slow)? What is wrong with measuring the voltage of a cell containing only one solute component on each side (i.e., Fe(II) of a given molality on one side and Fe(III) with the same molality on the other)?

1) A piece of magnesium weighing 2.00 gr. is dropped into 100 mL of 2.00 M H2SO4 when the reaction has ceased which of the reactants remains in excess and by how much? (Write the chemical reaction that takes place.) 

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5- How many mL of 2.0 M H2SO4 would be required to react with 25.0 gr. of zinc? 

(Write the chemical reaction that takes place.)
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6- What is the molarity of a solution which contains 25.0% H2SO4 by weight and which has a density of 1.13 gr/mL? 


Write a 1,050- to 1,400-word article based on your notes. Include the following:

Scene(s) identified that represent an application of DNA technology

Scene(s) identified that could be used in an application of DNA technology

Identification of ethical concerns arising from applications of DNA technology

Identification of legal concerns arising from applications of DNA technology

Identification of social concerns arising from applications of DNA technology

Calculate the molarity and normality of the following compounds:

a.80 μg/L HNO^3

b.135 μg/L CaCO^3

c.10 μg/L Cr(OH)^3 – Chromium(III) hydroxide will dissociate in water to form a chromium ion and 3 hydroxide ions. The charge of 1 hydroxide ion is -1. The number (III) should also give you a hint to determine n.

Which statements regarding shape and charge complementarity are true?

1. Charge complementarity occurs when specific noncovalent binding interactions occur between two contacting surfaces.

2. The "charge" interactions can be charge-charge, H-bonding, or van der Waals interactions.

3. Shape complementarity refers to the intimate contact made between an antibody and its target antigen.

4. Shape and charge complementarity explain exclusively the interactions between an antibody and its target antigen.

a) Only statements 1, 2, and 3 are true.

b)Only statements 2, 3, and 4 are true.

c) Only statements 1, 2, and 4 are true.

d) All of the listed statements are true.

Two intracellular molecules A and B, are normally synthesized at a constant rate of 1000 molecules per second per cell. The degradation rate of A is 0.01/s and B is 0.1/s

A}Write a differential equation to describe how the number of molecules of A and B change over time

B}What is the steady state value of A and B? How many molecules of A and B will there be after 1 second at steady state?

C}If the rate of synthesis of both A and B were suddenly increased 10-fold to 10,000 molecules per second—without any change in their degradation rate—how many molecules of A and B would there be after one second?

D}Which molecules would be preferred for responding rapidly changing environment? Explain your answer

How can electronegativity change themselves when in the Periodic System moving vertically down through a main group (for a higher atomic masses) and horizontally in the system (for a higher group numbers)

I need a second set of eyes!! Does this make sense?

Once glucose is placed in a baggie we placed in distilled water. We pulled a sample of water from the bottom of the beaker and added Benedict solution to it which turned it to a light blue. Adding Benedict solution to glucose tests for presence of reducing sugars that have the aldehyde functional group. – CHO. Once the Benedict solution turned glucose solution to light blue it was then heated in boiling distilled water. Positive results indicates a color change to orange proving diffusion occured. The bright red on the bottom of the tube indicates the presence of the aldehyde group. Benedict solution is a deep-blue alkaline solution because it contains copper sulfate. When mixed with glucose and heated, glucose oxidizes and gives up an electron that copper accepts and then become reduced which turns Benedict’s solution and sugar into an orange color and blue copper ion is reduced to a red copper ion. Therefore, because glucose can reduce copper in the Benedict Solution, it’s called a reducing sugar. Test was not redone. Our group and the group we compared our results with had same results and color.

Determine the pH of each of the following solutions.

Part A

0.24 M KCHO2

Express your answer to two decimal places.

Part B

0.22 M CH3NH3I

Express your answer to two decimal places.

Part C

0.21 M KI

Express your answer to two decimal places.

define and provide expamples for each of the following

1) qualitative photochemistry

2) quantitative photochemistry

What volumes (in mL) of 1.0 M triethanolamine and 1.0M HNO3 is required to prepare 1.0L of pH 7.76 buffer using triethanolamine that is 0.020 M in both triethanolamine and triethanolammonium ion?

4. Under each of the following conditions, please predict the effect the mutation will have on the rate at which glycolysis will proceed in liver cells:

a. Loss of the allosteric site for ATP in phosphofructokinase

b. Loss of binding site for citrate in phosphofructokinase

c. Loss of the phosphatase domain of the bifunctional enzyme that controls the level of fructose 2,6-bisphosphate

d. Loss of the binding site for fructose 1,6-bisphosphate in pyruvate kinase.

Consider the following equilibrium:
N2O4(g)?2NO2(g)
Thermodynamic data on these gases are given in Appendix C in the textbook. You may assume that ?H? and ?S? do not vary with temperature.

Part A At what temperature will an equilibrium mixture contain equal amounts of the two gases? Express your answer using four significant figures

Part B

At what temperature will an equilibrium mixture of 1 atm total pressure contain twice as much NO2 as N2O4?

Express your answer using four significant figures.

Part C

At what temperature will an equilibrium mixture of 9 atm total pressure contain twice as much NO2 as N2O4?

Express your answer using four significant figures.

Part D

Rationalize the results from parts B and C by using Le Chatelier's principle (Section 15.7 in the textbook).