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
siniylev [52]
2 years ago
10

PLEASE SOMEBODY EXPLAIN THIS :(((

Chemistry
1 answer:
djverab [1.8K]2 years ago
4 0

Answer:

\boxed{ \sf \: R_f  \: value \: of \: sample \: 1 =0.3142}

<h3>Explanation:</h3>

In Analytical Chemistry chromatography is widely used for the separation of samples.

  • In thin layer chromatography, the mixture of components are separated on the basis of their polarity.
  • The solvent solution(mobile phase) that we use are non polar & silica gel( TLC paper made of/stationary phase) are polar.
  • Consider the mixture we have taken consist of two samples having large polar difference.
  • Due to opposite nature of silica gel(polar) & solvent solution (non polar) the movement become easy & due to capillary action solvent solution rise to the top.
  • The mixture of sample we have taken, the sample have less polarity have high peak or they travel more distance than that of more polar sample when they dipped into the solution.

In the given diagram, mixture of 8 samples are separated on the basis of their polarity, the distance travelled by solvent is 35 mm, distance travelled by sample 1 is 11 mm & similarly distance travelled by sample 2,3,4,5,6,7 are 15,31,4,22,25,33 in mm respectively.

Rf Value: Rf value is retention factor which tells about relative absorption of each sample & range of Rf value is 0-1.

Formula to calculate Rf value is

\sf R_f  \: value = \frac{distance \: moved \: by \: sample}{distance \: moved \: by \: solvent}

Now, solving for Rf value of sample 1

<em>Given:</em>

Distance moved by sample 1 = 11 mm

Distance movedby solvent = 35 mm

<em>To find:</em>

Rf value of sample 1 = ?

<em>Solution:</em>

Substituting the given data in above formula,

\small \sf R_f  \: value = \frac{distance \: moved \: by \: sample \: 1}{distance \: moved \: by \: solvent}   \\  \small \sf R_f  \: value =  \cancel\frac{11  \: mm}{35 \:  mm}  = 0.3142

\small \boxed{ \sf \: R_f  \: value \: of \: sample \: 1 =0.3142}

<em><u>Thanks for joining brainly community!</u></em>

You might be interested in
When magnesium combines with sulfur to form magnesium sulfide, it is oxidized to Mg2+. Which statement is true about this reacti
Vlad1618 [11]
<h3><u>Answer;</u></h3>

B. It involves loss of electrons.

<h3><u>Explanation;</u></h3>
  • Oxidation occurs when electrons are lost by an atom while reduction refers to the gain of electrons by an atom.
  • <u><em>In this case, magnesium atom reacts with sulfur to form magnesium sulfide by loosing two electrons and forming magnesium ion (Mg2+). Therefore magnesium undergoes oxidation.</em></u>
  • Sulfur, on the other hand will gain electrons to form Sulfide ions, therefore it undergoes reduction.
  • Therefore;<em><u> In magnesium sulfide (MgS), magnesium loses two electrons and becomes a cation with a positive-two charge. Likewise, sulfur obtains the two electrons lost from magnesium and becomes an anion with a negative-two charge. However, the overall charge of MgS is zero.</u></em>
6 0
3 years ago
The volume of a gas decreases to half of its original volume, but the gas maintains the same number of moles and temperature. Ac
Leya [2.2K]
It will double

Key
P = pressure of the gas
n= number of moles of the gas
V= volume of the gas
R = the gas constant
T= absolute temperature of the gas
If V is halved when n and T remain the same
4 0
3 years ago
the air above earth's surface is at a different temperature what is responsible for this difference in temperature
Bas_tet [7]
Altitude is the reason why the temprature is different.
8 0
3 years ago
What does air pressure mean
Cloud [144]

Answer:

The definition of air pressure is the force exerted onto a surface by the weight of the air. An example of air pressure is the average sea-level air pressure of 101.325

Explanation:

7 0
2 years ago
Which of the following steps in a star's life cycle takes the longest?
Vsevolod [243]
<span>The correct anwser is "C.fusion of hydrogen atoms"</span>
4 0
3 years ago
Other questions:
  • In which of the following atoms are valence electrons in the lowest average potential energy states?
    10·1 answer
  • How does a graph with no trend differ from a graph with anomalous data points?
    13·2 answers
  • PLEASE HELP IM DYING OF CHEMISTRY, I NEED HELP FINDING ATOMIC MASS WITH ISOTOPES
    15·1 answer
  • Five students had to answer the question how are elements arranged in a periodic table
    8·1 answer
  • Which describes Bohr’s contribution to the atomic model?
    7·1 answer
  • In which way do buffalos protect themselves from predator animals such as lions​
    11·1 answer
  • What does a nonpolar covalent bond show about the electronegativities of its
    13·1 answer
  • What provides the energy to set the water cycle in motion?
    10·1 answer
  • Bobota
    5·1 answer
  • PLZ HELP!!!!!!!!!!!!!!!!!!!!!!!!!Describe Earth's rotation and revolution . Be sure to include the durations and what they are r
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!