06/16/20

In the redox reaction 6 Fe²⁺ + Cr₂O₇²⁻ + 14 H⁺ → 2 Cr³⁺ + 6 Fe³⁺ + 7 H₂O, what is the reducing agent? A) Fe²⁺ B) Cr₂O₇²⁻ C) H⁺ D) Cr³⁺ E) Fe³⁺
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06/16/20

What is the concentration in molarity of a solution which is 4.31 %m/v benzene (C₆H₆, MM =78.11 g/mol ) in CCl₄ (MM = 153.81 g/mol)?
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06/16/20

how many grams of solid barium sulfate form when 10mL of 0.1M of Ba(NO3)2 reacts with 10 mL of 0.5M of sulphuric acid?
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06/15/20

One deciliter solution consists of 200 mg of KMnO4, and the density of the solution is found to be 1.037 g/mL. What is the molarity and the molality of the solution?
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06/15/20

To prepare a buffer solution with a pH of 5.10, calculate how many ml of NaOH solution should be added to 500 ml of HAc solution? (Concentration of both NaOH and HAc is 0.1 mol/L, pKa (HAc)=4.75.)
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06/15/20

7. The amino acid proline has a structure that is unusual among amino acids. Compare the general structure of an amino acid with that of proline
7. The amino acid proline has a structure that is unusual among amino acids. Compare the general structure of an amino acid with that of proline, shown here:COO- H2N C HH2C CH2 CH2What is the major... more
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06/15/20

8. To prepare a buffer solution with a pH of 5.10, please calculate how many ml of NaOH solution should be added to 500 ml of HAc solution?

8. To prepare a buffer solution with a pH of 5.10, please calculate how many ml of NaOH solution should be added to 500 ml of HAc solution? (Concentration of both NaOH and HAc is 0.1 mol/L, pKa... more
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06/15/20

8. To prepare a buffer solution with a pH of 5.10, please calculate how many ml of NaOH solution should be added to 500 ml of HAc solution?

8. To prepare a buffer solution with a pH of 5.10, please calculate how many ml of NaOH solution should be added to 500 ml of HAc solution? (Concentration of both NaOH and HAc is 0.1 mol/L, pKa... more
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06/15/20

7. The pH of blood plasma from a patient was found to be 7.6, a life-threatening situation. Calculate the ratio [HCO3-]/[H2CO3] in this sample of blood plasma.

7. The pH of blood plasma from a patient was found to be 7.6, a life-threatening situation. Calculate the ratio [HCO3-]/[H2CO3] in this sample of blood plasma. (Ka of H2CO3, carbonic acid, is... more
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06/15/20

Determine the sign of G for the following reaction. Is the reaction spontaneous, nonspontaneous, or temperature dependent? (5 points) N2(g) + 2O2(g) + 16.2 kcal  2N2O(g)
Determine the sign of G for the following reaction. Is the reaction spontaneous, nonspontaneous, or temperature dependent? (5 points)N2(g) + 2O2(g) + 16.2 kcal  2N2O(g)
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06/15/20

How do I rank these elements?
Rank the following elements in order of increasing ionization energy: boron, fluorine, helium, magnesium, and potassium.
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06/15/20

Calculate the amount of heat required to raise the temperature of an 74 g sample of water from 31 Celsius to 63 Celsius

Express your answer using two significant figures
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06/14/20

An aqueous solution of sucrose (C12H22O11) is prepared by dissolving 6.5532 g in sufficient deionized water to form a 50.00 mL solution. Calculate the molarity of the solution.
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06/12/20

calculating volume of co2
what is the volume of carbon dioxide gas formed at s.t.p when 2.15 g of liquid hexane is completely burnt in the air. (H=1, C=12, 1 mole of gas occupies a volume of 22.4dm3 at s.t.p)
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06/12/20

Please choose the write answer
A chemist mixes a 0.00040 mol/l solution of Ca(OH)2 where Kb=5.0*10^-11. The PH of this solution isa)between 3 and 6b) between 9 and 12c) between 6 and 9d) between 12 and 14
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06/12/20

Please choose the write answer
What is the PH of 0.010 M solution of acetic acid? Ka=1.8*10^-5a)2.74b)4.74c)6.74d)3.37
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06/12/20

Solid lithium hydroxide is used to remove exhaled CO2 from space vehicles by forming lithium carbonate & liquid water What mass of carbon dioxide can be absorbed by 10.0 g of lithium hydroxide
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06/12/20

A compound is combusted that contains only carbon and hydrogen, and it is found to be 85.6% C by mass. What is the compound's empirical formula?
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06/12/20

A 15.79 g sample of a hydrate of an iron(II) sulfate compound was heated, without decomposing the sulfate to drive off the water. The mass was reduced to 8.63 g . What is the formula of the hydrate?
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06/12/20

A particular protein sample is found to have 1 atom of iron in its chemical formula. If the mass percent of Fe in the compound is 0.330% Fe, what is the molar mass of the protein?
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06/12/20

What is the concentration of sodium ions in 0.300 M Na₂SO₄?
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06/12/20

What volume (in L) of 1.1 M FeCl₃ would be required to obtain 0.70 moles of Cl⁻ ions?
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06/11/20

What is the percent yield? Check description for full question.
If 0.45 grams of each reactant was used how much Zinc chloride would form? Zn + HCl --> ZnCl2 + H2 what is the percent yield if only .26 grams were recovered?
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06/11/20

What is the amount of solid that each product forms? What is the percent yield? Check description for full question.
3.5 g Calcium acetate reacts with 5.5g sodium hydroxide in a double displacement reaction write a balanced chemical equation. Determine the amount of solid each product that forms. Determine the... more
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06/11/20

Write a balanced equation to represent the reaction taking place in the Erlenmeyer flask.
Write a balanced equation to represent the reaction taking place in the Erlenmeyer flask.
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