User Account

All Pages

Explain the rf values changed when the eluant was change

Assignment Help Chemistry
Reference no: EM13222589

Explain why the Rf values changed when the eluant was changed from 100% petroleum ether to a 95:5 mixture of petroleum ether-ethyl acetate. Why UV light is not a useful visualization technique in every circumstances?

Reference no: EM13222589

Questions Cloud

Explain a solution is to change the temperature : One way to recrystallize a solute from a solution is to change the temperature. Another way is to evaporate solvent from the solution. A 340 g sample of a saturated solution of KNO3 in water is prepared at 25.0.
What price-quantity combination maximizes revenue : You are the manager of a monopoly, and your demand and cost functions are given by P = 200 - 2Q and C(Q) = 2000 + 3Qsquared, respectively. a. What price-quantity combination maximizes your firm's profits b. Calculate the maximum profits.
Should the firm buy the 10trucks if real interest rate given : Acme Landfill Company is considering the purchase of 10 better trash collection trucks. Each truck costs $50,000 and will last 7 years. the firm estimates that the entire purchase will increase its annual total annual revenues by $100,000 per year..
Clarify the warranty coverage and cost : A 50-person office needs a new color printer to prepare high-speed, multi-page reports for staff projects. The printer must be able to handle both high quality and draft quality color printing back-to-back pages.
Explain the rf values changed when the eluant was change : Explain why the Rf values changed when the eluant was changed from 100% petroleum ether to a 95:5 mixture of petroleum ether-ethyl acetate. Why UV light is not a useful visualization technique in every circumstances?
Explain the specific heats of solid and liquid ethanol : Ethanol melts at -114 C and boils at 78 C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g.K and 2.3 J/g.K, respectively.
What is the arrival rate for each team : What is the utilization rate of a clinician? (Round your answer to 4 decimal places.)
Advocating legislative change in u.s. withdrawal from nafta : Write an argumentative essay where you will write a paper advocating legislative change in U.S. withdrawal from NAFTA.
Explain a laser pulse of light with a frequency : A laser pulse of light with a frequency of 1.14 × 1020 Hz contains 2000 photons. Calculate the energy in J of the pulse.

Reviews

Write a Review

Chemistry Questions & Answers

  Define oxalate buffer technician by mistake

While preparing oxalate buffer technician by mistake added 0.1 M of CaC2O4. (pKsp = 7.9) to 0.2 M solution of oxalic acid

  Define the concentration of d-lactose in the sample

The optical rotation of a sample composed of only D-lactose is determined [a]abs = 0.99 degrees. [a]D is known to be 52.3 degrees for D-lactose. If the cell path length was 0.8 dm and the concentration of D-lactose in the sample was 0.17 g/mL,

  What is the theoretical yield of ph3

What is the theoretical yield of PH3 when 150 grams of Na3P is mixed with 250 grams of H2O? If the actual yield is 30 grams, what is the % yield?

  State the standard reaction enthalpy for the decomposition

The standard reaction enthalpy for the decomposition of CaCl2_NH3 into CaCl2 and NH3 is nearly constant at +78 kJ/mol between 350 K and 470 K.

  What is the percent yield of cao in the reaction caco3

What is the percent yield of CaO in the reaction CaCO3 yield CaO + CO2 if 5.33 g of CaO are obtained when 10.0 g of CaCO3 are used?

  State a solution is made from mixing compounds a

a solution is made from mixing compounds A, mole fraction 0.5833, and B mole fraction 0.417. the vapor pressure of A at 55c is 95 mmHg and the vapor pressure of B at the same temperature is 42 mmHg

  Define what will the pressure measure

In a seperate trial the student puts 214 mL of the same liquid into the same flask at the same conditions. What will the pressure measure (in kPa) in the second trial?

  State saturated aqueous sodium chloride

Saturated aqueous sodium chloride(d=1.2g/mL) is added to the following mixtures in order to dry the organic layer. Which layer is likely to be on the bottom in each case?

  What mass,in grams, of sulfur dioxide is needed

sulfur dioxide is an unwelcome result of burning soft coal in power plants. Some of the sulfur dioxide ends up as sulfuric acid ( H2SO4) in acid rain.

  Consider a saturated colution of calcium oxalate

Consider a saturated colution of calcium oxalate, CaC2O4, in which the following reactions can occur: (CaC2O4)4 -2 (s) ---> Ca+2 + C2O4 -2 Ksp=1.3e-8

  Determine value for the rate of formation of hcl

Determine value for the rate of formation of HCl during the same interval  of 3 seconds If the rate of disappearance H2 = -0.13 M/s at this specific time?

  The expressions for kc for the following reactions

Write the expressions for Kc for the following reactions. a. 2O3(g) --> 3O2(g) b. Ti(s) + 2Cl2(g) --> TiCl4(l) c. 2C2H4(g) + 2H2(g) --> 2C2H6(g) + O2(g)

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd