What are three main differences between High Performance Liquid Chromatography and Gas Chromatography?

Calculate the wavelength of each of the following frequencies of electromagnetic radiation

A) 104.8 MHz (typical frequency for FM radio broadcasting)

B)1100 kHz (typical frequency for AM radio broadcasting)

C) 835.6 MHz (common frequency used for cell phone communication)

calculate the change in pH when 3.00 ml of 0.1 M HCL is added to 100 ml of a buffer solution that is 0.1 M in NH3 and 0.1 M in NH4Cl.
Calculate the change in pH when 3.00 ml of 0.1 M NaOH is added to the original buffer solution.

How will the following situations affect your final calculation of molarity of HC2H3O2? (higher, lower, unaffected. be specific) A) You wash the sides of the flask with deionized water to remove any vinegar of NaOH solution adhering to the side of the flask. B) You add 20 mL of water to the vinegar in the flask (assume no drops of vinegar adhere to the side of the flask). C) The tip of the buret is not filled when you start a titration but is filled when you finish the titration. D) The molarity of the standard NaOH solution is miscalulated and the true value is higher than the concentration given. E) As you are refilling your buret, some of the NaOH spills over the side and runs down the buret into the flask you intend to titrate.

Assume you dissolve 0.235 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 3.00 ✕ 102 mL of solution and then titrate the solution with 0.128 M NaOH.

C6H5CO2H(aq) + OH-(aq) C6H5CO2-(aq) + H2O(ℓ)

What are the concentrations of the following ions at the equivalence point?

Na+, H3O+, OH-

C6H5CO2-

___M Na+

___M H3O+

___M OH-

___M C6H5CO2-

What is the pH of the solution?

predict the signs of delta G, delta H, delta S, of the system for the following processes

a)Ammonia melts at -60 degrees Celcius

b) ammonia melts at -77 Celcius (normal melting point of Ammonia)

c) ammonia melts at 100 Celcius

Describe the appearance of:

Silver nitrate test

Commercial 1- bromobutane: unheated? and heated?

Commercial t-butly chloride: unheated? and heated?

Sodium iodide test

Commercial 1- bromobutane: unheated? and heated?

Commercial t-butly chloride: unheated? and heated?

Part A

Determine the [OH−] of a solution that is 0.140 M in CO3.

Express your answer using two significant figures.

Part B

Determine pH of this solution.

Express your answer to two decimal places.

A 0.035 mol sample of a weak acid, HA, is dissolved in 601 mL of water and titrated with 0.41 M NaOH. After 33 mL of the NaOH solution has been added,

the overall pH = 5.281. Calculate the Ka value for the HA.

Let’s write out the acid dissociation:
HA ↔ A– + H+ Ka=???

Now, if we add NaOH (strong base), it will react with the HA (acid). So let’s construct an ICE table in moles to find out what’s left after reaction:

Can you pleae explain how they got the Change value== .0135???

Tia has a sample of pure gold (Au). She weighed the sample and the result was 12.6 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 12.6 g of pure gold.

How would I separate and purify 2 out of 3 of: 50% o-toluic acid, 40% fluorene, and 10% 1,4-dibromobenzene, using any of the following: 1M NaOH, 6M NaOH, 1M HCl, 1M NaHCO3, saturated sodium chloride, diethyl ether, 95% ethanol, methanol, alcohol, acetone, hexane, toluene, methylene chloride, or granular anhydrous sodium sulfate?

The decomposition of ozone into oxygen is believed to occur by the following mechanism:

O₃   <-->   O₂ + O       fast, equilibrium

O +   O₃ --> 2 O₂       slow

The rate constant for the overall rate law is 30.6 at 87^oC. If you start with a mixture of 1.5 M O₃ and 3.0 M O₂, what is the initial rate of the reaction?

1.Calculate the pH of a solution obtained by mixing 100 ml of 1 M HEPES and 25 ml of 1 M NaOH and adjusting the volume to one liter with water.

2. Calculate the pH of a solution obtained by mixing 100 ml of 1 M NH3 (pKa 9.25) and 60 ml of 1 M HCl and adjusting the volume to one liter with water. (Answer 9.07)

I want to know the specific calculation to get a final answer. Thank you.

For each of the following compounds, predict the energy barrier to rotation (looking down any one of the C-C bonds 2,2-dimethylpropane & 2-methylpropane

2H₂S (g) = 2H₂ (g) + S₂ (g)

When heated hydrogen sulfide gas decomposes according to the equation above. A 3.40g smple of H₂S(g) is introduced into an evacuated rigid 1.25 L container. The sealed container is heated to 483 K, and 3.72 x10^-2 mol of S₂ (g) is present at equilibrium.

a) Write the expression for the equilibrium constant, K_c for the decomposition reaction represented above.

b) Calculate the equilibrium concentration in M of H₂ (g) and H₂S (g) in the container 483 K

c) Calculate the value of the equilibrium constant K_c for the decomposition reaction of 483K