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Sati [7]
3 years ago
11

Why must sample spots be above the solvent in paper chromatography

Chemistry
1 answer:
marishachu [46]3 years ago
6 0
Because if they are submerged in the solvent, they would dissolve! This would prevent them from seperating and not allow you to actually record anything
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How do you know something is there if you can't see it? *
lesantik [10]

We can only see things if they give off light but be we use other senses to gather information about things we cannot see.

8 0
2 years ago
Explain why the replacement of the glutamic acid by valine changes the way that molecules of b-globin interact with each other.
aleksandr82 [10.1K]
For the answer to the question above, <span>Hydrophobic regions and hydrophilic regions in the molecules of the b-globin. The replacement causes these hemoglobin molecules to be stickies which gives the cell its sickle shape.
I hope this helps. Have a nice day!</span>
3 0
3 years ago
What is the empirical formula for a substance that is composed of 40.66% carbon, 8.53% Hydrogen,23.72% Nitrogen, and 27.09% Oxyg
prohojiy [21]

Answer:

THE EMPIRICAL FORMULA OF THE SUBSTANCE IS C2H5NO

Explanation:

The steps involved in calculating the empirical formula of this substance in shown in the table below:

Element                            Carbon           Hydrogen          Nitrogen         Oxygen

1. % Composition              40.66              8.53                 23.72                27.09

2. Mole ratio =

%mass/ atomic mass       40.66/12         8.53/1          23.72/14            27.09/16

                                       =  3.3883            8.53              1,6943             1.6931

3. Divide by smallest

value (0.6931)          3.3883/1.6931    8.53/1.6931    1.6943/1.6931   1.6931/1.6931

                               =      2.001                  5.038           1.0007                      1

4. Whole number ratio        2                       5                   1                               1

The empirical formula = C2H5NO

7 0
3 years ago
How many atoms are in 3 moles of nitrogen
olga nikolaevna [1]

Answer:1 mol of Mg(NO3)2 contains 6.022*10^23 molecules

3 mol Mg(NO3)2 contains 3*6.022*10^23 = 1.81*10^24 molecules

Each Mg(NO3)2 molecule contains 2 N atoms  

Number of N atoms = 2*1.81*10^24 = 3.62*10^24 N atoms.

8 0
3 years ago
PLEASE HELP!!! WILL MARK BRAINLIEST!
fredd [130]

The longest chain of carbons will contain the highest number of carbon atoms.

Explanation:

question 3 - the longest chain have 7 carbon atoms

question 4 - the longest chain have 8 carbon atoms

question 1 - the longest chain have 5 carbon atoms

You may find in the attached picture the longest chain colored in blue for each of the compounds.

Learn more about:

longest carbon chain

brainly.com/question/4859077

brainly.com/question/3542033

#learnwithBrainly

5 0
3 years ago
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