what is the difference between K-factor and R-factor?

Explain and compare thin layer chromatography with column chromatography (in-detailed answer)

What does R/S stereochemistry indicate?

Determine the activation energy in kJ/mol for a first order reaction if its specific rate constant 8.30e-05 s^-1 at 350.0 K and 3.25e+01 s^-1 at 560.0 K.

E_a = ______ kJ/mol

Explain how the solid phase extraction catridges separates the colorant (a potential interference) from the analytes.

Most of our discussion of transition metals has focused around them becoming positively charged ions. However, many of the transition metals will also become negatively charged ions. Using what you have learned from quantum mechanics and about electron configurations, predict which transition metals are most likely to form anions with a charge of -1 and explain the prediction.

In a titration of a 100.0mL 1.00M NH₃ solution with 1.00M HCl, what is the pH of the solution after the addition of 127 mL of HCl? K_b = 1.8 x 10^-5 for NH₃

Consider the titration of a 26.0-mL sample of 0.180 M CH3NH2 with 0.155 M HBr. (The value of Kb for CH3NH2 is 4.4×10−4.)

Determine the pH at 4.0 mL of added acid

Determine the pH at one-half of the equivalence point.

Determine the pH after adding 6.0 mL of acid beyond the equivalence point.

19.36:

Part A

Ca-40 (atomic mass = 39.96259 amu)

Express your answer using five decimal places.

Mass defect =		amu

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Part B

Express your answer using four significant figures.

Binding energy per nucleon =		MeV/nucleon

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Part C

V-51 (atomic mass = 50.94396 amu)

Express your answer using five decimal places.

Mass defect =		amu

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Part D

Express your answer using four significant figures.

Binding energy per nucleon =		MeV/nucleon

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Part E

Ag-107 (atomic mass = 106.905092 amu)

Express your answer using five decimal places.

Mass defect =		amu

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Part F

Express your answer using four significant figures.

Binding energy per nucleon =		MeV/nucleon

Chlorophyll a and chlorophyll b are very closely related structures and you were not able to separate them from each other in this lab by column chromatography. For each of the following variables indicate what specific change, if any, could be made to the procedure to help you separate these compounds during your column chromatography.

Column Length
Column Solid Phase
Extraction Solvents
Elution Solvents
Elution Rate

Compare the advantages and limitations of column chromatography with those of thin-layer and gas chromatography. Discuss all 3 chromatography methods. When you would use them and in which case is each useful and not useful?

The anthocyanin in hydrangeas can be isolated and used as an environmentally friendly pH indicator for titrations. At the end of a titration reaction of a strong acid with a strong base, you have a neutral solution. What color do you expect anthocyanin to be at the end of a titration? Describe a lab experiment to support your prediction.

A 3.87 gram sample of ascorbic acid (Vitamin C) yield 5.80 grams of CO₂ and 1.58 grams of H₂O on combustion. What is the empirical formula of this compound? (This compound contains only C, H, and O.)

In an ideal solution of A and B, 2.75 mol are in the liquid phase and 4.255 mol are in the gaseous phase. The overall composition of the system is Z_A = 0.420, and x_A = 0.310. Calculate y_A.

1)When one atom transfers one or more valence electrons to another atom, a(n) ___ is formed.

A.Covalent Bond

B.Ionic Bond

C.Metallic Bond

D.All of the above

2)Typically, when two atoms form a chemical bond, the expected result is that the electrons

A.Will be in the excited state

B.Will be completely removed from both atoms

C.Will compete a noble gas configuration for both atoms

D.None of the above

3)Which of the statements about ionic solids is FALSE?

A.Ionic solids conduct electricity when dissolved in water.

B.Ionic solids are good conductors of electricity.

C.Ionic solids form crystals

D.Ionic solids can be formed by reacting an alkali metal with a halogen.

4)The balanced net ionic equation for the reaction between acetic acid and sodium hydroxide is:

A.H⁺(aq) + OH^-(aq) = H₂O(l)

B.HC₂H₃O₂(aq) + OH^-(aq) = C₂H₃O₂^-(aq) + H₂O(l)

C.H⁺(aq) + C₂H₃O₂^-(aq) + OH^-(aq) = C₂H₃O₂^-(aq) + H₂O(l)

D.H⁺(aq) + C₂H₃O₂^-(aq) + OH^-(aq) = C₂H₃O₂^-(aq) + H⁺(aq) + OH^-(a)