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
m_a_m_a [10]
3 years ago
14

For a successful TLC experiment, you need to pay attention to the details. From the list of instructions and tips below, select

the detail that is NOT important to a TLC experiment. O O Do not disturb the developing chamber. Do not move it or carry around. Closely monitor the temperature of the solvent in the chamber. Use only a plain pencil to draw a starting line and mark the compounds' spots. A pen or marker should never be used. Cover the developing chamber with a watch glass. Ensure the solvent level in the chamber is lower than the starting line where you spot the samples.
Chemistry
1 answer:
Juli2301 [7.4K]3 years ago
5 0

Answer:

Temperature is not that important in TLC.

Explanation:

The concept of TLC is that a solvent (or mixture of solvents) ascends in a capilary system and the differences in interections between solvent and capilary of the substances present allow their separation.

In this process it's important that the air is saturated with solvent vapor, so the lid is important; the solvent must ascend by the capilar, so making it stedy is important, also making sure the starting line is above the solvent level is crucial for this same reason; using a marker would ruin a experiment because most marker's ink (if not all of them) would be carried by the solvent as well, but carbon is not, so a pencil must be used.

You might be interested in
Lf the attractive forces among the solid are less than the attractive forces between the solid and a liquid, the solid will?
Serggg [28]

Answer:

c is right for this question

Explanation:

8 0
3 years ago
The following data were measured for the reaction BF3(g)+NH3(g)→F3BNH3(g): Experiment [BF3](M) [NH3](M) Initial Rate (M/s) 1 0.2
Rama09 [41]

Answer:

-r_{A}=k\times[BF_3]^{1}\times[NH_3]^{1}

Explanation:

The rate law of a chemical reaction is given by

-r_{A}=k\times[BF_3]^{\alpha}\times[NH_3]^{\beta}

This law can be written for any experiment, and making the quotient between those expressions the reaction orders can be found

Between experiments 1 and 2  

\frac{-r_{A1}}{{-r}_{A2}}=\left(\frac{\left[NH_3\right]_1}{\left[NH_3\right]_2}\right)^\beta

Then the expression for the calculation of \beta

\beta=\frac{ln\frac{-r_{A1}}{-r_{A2}}}{ln\left(\frac{\left[NH_3\right]_1}{\left[NH_3\right]_2}\right)}=\frac{ln\frac{0.2130}{0.1065}}{ln\left(\frac{0.250}{0.125}\right)}

Resolving  

\beta=1

Doing the same between experiments 3 and 4 the expression for \alpha is

\alpha=\frac{ln\frac{-r_{A3}}{-r_{A4}}}{ln\left(\frac{\left[BF_3\right]_3}{\left[BF_3\right]_4}\right)}=\frac{ln\frac{0.0682}{0.1193}}{ln\left(\frac{0.200}{0.350}\right)}

Resolving  

\alpha=1

This means that the rate law for this reaction is  

-r_{A}=k\times[BF_3]^{1}\times[NH_3]^{1}

5 0
3 years ago
Why does knowing types of mixtures help you to identify a substance?
Reil [10]

Answer:

This is my own explanation:

Explanation:

It is important to know the mixtures you input together because you may determine the type of substance you produced from different elements and several combinations of matter. This assists in identifying your specific substance.

8 0
2 years ago
Out of Br2 and NaBr which compound is more likely to be more soluble in CCl4
saul85 [17]
Br2 because it is non polar and so is CCl4 and like molecules dissolve like molecules therefore Br2 will dissolve in CCl4
6 0
3 years ago
Is the sun typical of these nearby stars
marshall27 [118]
No the sun is the biggest star in the universe.
8 0
3 years ago
Other questions:
  • Select all that is true.
    15·2 answers
  • Do all systems have energy?
    5·1 answer
  • Which method of moving materials in and out of the cell requires energy.
    5·2 answers
  • How many moles of naf are in 34.2 grams of a 45.5% by mass naf solution?
    7·1 answer
  • Question 2 (1 point)
    6·1 answer
  • How does particle model explain a change of state of matter?
    7·1 answer
  • A 25.0mL sample of an acetic acid solution is titrated with a 0.175M NaOH solution. The equivalence point is reached when 37.5mL
    13·1 answer
  • 6 Spills and 100 squares
    8·1 answer
  • 1. we used __________ to represent an element.
    15·2 answers
  • How to recover ballpoint ink washed off from a paper?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!