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
If the valency of oxygen is 2, derive the valencies of the other elements present in the following oxides. Na2O, ZnO , Al2O3 , M
11Alexandr11 [23.1K]

Answer:

1)Na2O

let the valency of Na is x

2(x)+(2)=0

2x+2=0

2x=-2

x=-1

2)ZnO

let the valency of Zn is x

x+2=0

x=-2

3)Al2O3

let the valency of Al is x

2(x)+3(2)=0

2x+6=0

2x=-6

x=-3

4)MgO

let the valency of Mg is x

x+2=0

x=-2

7 0
3 years ago
Read 2 more answers
How reactive is an atom of Sodium(Na) and why?
cricket20 [7]
The correct option is this: SODIUM IS VERY REACTIVE BECAUSE IT DOES NOT HAVE A FULL VALENCE SHELL.
For an atom to attain an octet form, it must have eight electrons in its outermost shell. Elements with eight electrons in their outermost shells are un-reactive. Sodium has only one electron in its outermost shell, this makes it to be very reactive because it is very willing to react with suitable elements in order to become stable.
5 0
3 years ago
Read 2 more answers
Which isotope is used to treat cancer?<br> (1) C-14 (3) Co-60<br> (2) U-238 (4) Pb-206
lions [1.4K]
I believe doctors use (3) Co-60 to treat ILWs. Uranium and Carbon are not used, and a different isotope of lead is used to be attached to monoclonal antibodies.
8 0
3 years ago
What allows electrical charges to move freely
Zolol [24]

Explanation:

Certain materials, called conductors, allow electric charge to move pretty freely through them. ... Other materials, like plastic and rubber, are called insulators because they don't allow electric charges to move through them.

8 0
3 years ago
2. If volume is increased, the number of<br> collisions per second
Archy [21]

Answer:

decreases

Explanation:

4 0
3 years ago
Other questions:
  • During the summer, after a big storm blows through, David notices leaks from his air conditioner. Which of the following is the
    10·2 answers
  • What new information can you add to your definition of physical change ?
    11·1 answer
  • What is the shorthand electron configuration for Ba2+​
    15·1 answer
  • Given the starting solution had a concentration of 1.25 m, how many moles of co[h2o]6cl2 were available in the amount of startin
    6·1 answer
  • Which of the following is NOT true of a chemical reaction. PLZ HELP ASAP
    6·2 answers
  • I AM GIVING BRAINLIEST! PLEASEEEEEE HELPPPPPP I NEED HELPPP
    6·1 answer
  • Why are the group I elements are very active​
    6·1 answer
  • Some species of hares are brown most of the year, but change color to white in the winter. This allows them to blend in
    7·1 answer
  • Which describes an covalent bond?
    11·2 answers
  • For the reaction below , label each reactant as an electron pair acceptor or electron pair donor and as a Lewis acid or a Lewis
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!