1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Aleksandr-060686 [28]
3 years ago
12

A student is comparing two samples of crystalline organic solids. A TLC analysis shows a single spot for each sample and the co-

spot with the same Rf value. Which of the following would provide the most conclusive evidence that the two samples are the same compound?
-rerun the TLC using more developing solvent
-rerun the TLC on a longer TLC plate
-Perform a mixture melting point
-mix the substances and run the TLC as a single spot
Chemistry
1 answer:
Digiron [165]3 years ago
5 0

Answer:

Rerun the TLC using more developing solvent

Explanation:

The TLC principle envolves the interaction of the samples with the solvent and the stationary phase.

For the solvent you are using at the moment, the interaction with the sample may be very similar for both cases depending with the polarity, what could indicate an equal value.

If you develops a new solvent with a different polarity, you can see if the samples are the same compound or not. Because a more polar compound will interact more with the stationary phase and a more non-polar compound will interact more with the solvent.

You might be interested in
Define and explain auto-ionization of water??? Explain please??
icang [17]

Answer:

Hey there!

Auto-ionization of water is an ionization reaction in pure water or in another aqueous solution, in which a water molecule, H2O, loses the nucleus of one of its hydrogen atoms to become a hydroxide ion, OH−.

Let me know if this helps :)

5 0
3 years ago
Read 2 more answers
What occurs as energy is transferred through the convective zone of the Sun? Check all that apply.
vlada-n [284]
-Photons are absorbed by hot gas atoms

-Energy is transferred through large-scale movement of material

-Energy is released into the photosphere
7 0
3 years ago
Read 2 more answers
Having studied the data for patterns and trends, you should now be able to draw
avanturin [10]

Answer:

The situation given here is imaginary such that the life of Rock has to be found using the half-life of the element lokium that has been found inside the rock.

Half-life of any material is the amount of time taken by that particular material to decay. Now the amount of lokium found in rock can show after how many half-lives this amount has been left out.

The time elapsed will be log (L) atoms X half-life.

Explanation:

3 0
2 years ago
An alpha particle is equivalent to the nucleus of an atom of which element?(1 point)
Monica [59]

Answer: An alpha-particle is identical to the nucleus of a normal (atomic mass four) helium atom i.e. a doubly ionised helium atom. Alpha particles (also termed alpha radiation or alpha rays) was the first nuclear radiation to be discovered, beta particles and gamma rays were identified soon after.

7 0
3 years ago
A solution of hydrochloric acid of unknown concentration was titrated with 0.10 M NaOH. If a 100.-mL sample of the HCl solution
madam [21]

<u>Answer:</u> The initial pH of the HCl solution is 3

<u>Explanation:</u>

To calculate the concentration of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is HCl

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is NaOH.

We are given:

n_1=1\\M_1=?M\\V_1=100mL\\n_2=1\\M_2=0.10M\\V_2=1mL

Putting values in above equation, we get:

1\times M_1\times 100=1\times 0.10\times 1\\\\M_1=\frac{1\times 0.10\times 1}{1\times 100}=10M

1 mole of HCl produces 1 mole of H^+ ions and 1 mole of Cl^- ions

To calculate the pH of the solution, we use the equation:

pH=-\log[H^+]

We are given:

[H^+]=0.001M

Putting values in above equation, we get:

pH=-\log (0.001)\\\\pH=3

Hence, the initial pH of the HCl solution is 3

6 0
3 years ago
Other questions:
  • Question 9 (1 point)
    9·1 answer
  • Molar mass of c(no3)2
    8·1 answer
  • How is the Delta Hf related to the delta H of <br> a reaction?
    10·2 answers
  • Part of making comparisons involves contrasting unlike characteristics.
    11·2 answers
  • What is the molality of a solution prepared by dissolving 75.8 g of ethylene glycol, HOCH2CH2OH, in 1.55 L of water? Assume the
    6·1 answer
  • 1. In Part 1 Synthesis Reactions, the product of the first reaction is Al(OH)3. The product of the second reaction is Mg(OH)2. D
    14·2 answers
  • Find the chemical reactions for each problem
    12·1 answer
  • PLS HELP URGENT I WILL MAKE BRAINLY AND LIKE FIVE STARS
    14·1 answer
  • 38- List the atomic number and name the element, whose electron configuration
    10·1 answer
  • Which statement explains why H2O has a
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!