Which of the following statements best describes a metabolic pathway?
1.the set of molecular reactions in which enzymes make or break down sugars
2.chemical reactions that do not involve the use of enzymes and that maintain homeostasis
3.a chemical reaction that makes or breaks down molecules
4.a linked sequence of chemical reactions catalyzed by specific enzymes
In: Chemistry
A science teacher tells her class that their final project requires the students to measure a specific variable and determine the velocity of a car with no more than 2.5% error. Jennifer and Johnny work hard and decide the velocity of the car is 34.87 m/s. The teacher informs them that the actual velocity is 34.15 m/s. Will Jennifer and Johnny pass their final project? SHOW ALL YOUR WORK TO GET ANSWER.
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In: Chemistry
Polypropylene has a degree of crystallinity that is dependent on its tacticity. Why?
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A 1.000 g sample of copper reacts with an unknown element X to form 1.908 g Cu5X9. What is element X??
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In: Chemistry
Analyze how how efficiency can be just a function of the two temperatures for Carnot Cycle of ideal gas.
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In each of the following questions, assume that there is no volume change when HCl is added to water in part (a) or the phosphate buffer in part (c).
(a) Calculate the pH when 0.029 moles of HCl are added to 1.000 liter of water.
(b) What is the difference between the pH of pure water (pH 7.00) and the pH of the solution after HCl was added?
(c) Calculate the pH when 0.029 moles of HCl are added to 1.000 liters of a buffer containing 0.396 M KH2PO4 and 0.201 M K2HPO4.
(d) The pH before the HCl was added is equal to 6.913. What is the difference between the pH before adding the HCl and after adding the HCl?
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The reaction CH2Cl2 (g) --> CH4 (g) + CCl4 (g) has Kp = 1.33 at 400K. A 5.00L reaction vessel is evacuated, and 15.00 g of CH2Cl2 (l) is added to the flask. The CH2Cl2 (l) rapidly vaporizes and the reaction starts. a. What will be all of the partial pressures of the gases when equilibrium is reached? b. Sketch a graph showing the initial concentration of each gas and how they change as the mixture approaches equilibrium. Set-up your graph so that equilibrium is reacched two thirds of the way from the start to the end of the graph
In: Chemistry
Some measurements of the initial rate of a certain reaction are given in the table below.
|
N2 |
H2 |
initial rate of reaction |
|---|---|---|
|
1.07M |
2.15M |
/17.0Ms |
|
1.07M |
0.951M |
/7.52Ms |
|
4.35M |
2.15M |
/281.Ms |
Use this information to write a rate law for this reaction, and calculate the value of the rate constant.
Round your value for the rate constant to 3 significant figures
Also be sure your answer has the correct unit symbol.
Rate = k?
k = ?
In: Chemistry
Over what pH range(s) could valine be used as an effective buffer? Explain your answer, supporting it with what we have discussed about buffers and amino acids
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The hydronium ion concentration of an aqueous solution of 0.497 M triethanolamine (a weak base with the formula C6H15O3N) is ... [H3O+] = _ M
The pOH of an aqueous solution of 0.462 M caffeine (a weak base with the formula C8H10N4O2) is .
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What is the pH of a solution prepared by adding 1.46g of NaNO2 to 143.00 mL of water? (Base Ionization Constant for NaNO2 = 2.22E-11)
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In: Chemistry
1. (9 pts) Consider a buffer solution composed of C6H5NH3+ and C6H5NH2. (Kb for the amine base is 3.9 x 10-10)
a. What is the optimum buffer range for this mixture?
b. What ratio of C6H5NH2 to C6H5NH3+ would be needed to buffer a solution at pH 4.10?
c. What is the pH of a solution containing 0.35 M C6H5NH3+ and 0.45 M C6H5NH2?
d. What is the pH after addition of 0.0015 mol of HBr to 20 mL of the solution in part c?
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