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
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
You might be interested in
For the following reaction, 35.4 grams of zinc oxide are allowed to react with 6.96 grams of water . zinc oxide(s) + water(l) --
IRISSAK [1]

Answer:

m_{Zn(OH)_2}=38.4g

Explanation:

Hello!

In this case, for the undergoing chemical reaction:

ZnO(s)+H_2O(l)\rightarrow Zn(OH)_2

We evaluate the yielded moles of zinc hydroxide by each reactant as shown below:

n_{Zn(OH)_2}^{by ZnO}=35.4gZnO*\frac{1molZnO}{81.38gZnO}*\frac{1molZn(OH)_2}{1molZnO}  =0.435molZn(OH)_2\\\\n_{Zn(OH)_2}^{by H_2O}=6.96gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{1molZn(OH)_2}{1molH_2O}  =0.386molZn(OH)_2

In such a way, since the water yields a smaller amount of zinc hydroxide we conclude it is the limiting reactant so the maximum mass is computed below:

m_{Zn(OH)_2}=0.386molZn(OH)_2*\frac{99.424 gZn(OH)_2}{1molZn(OH)_2} \\\\m_{Zn(OH)_2}=38.4g

Because the water limits the yielded amount of zinc hydroxide.

Best regards!

5 0
3 years ago
When a substance is heated, what causes its properties to change?
hoa [83]

The molecules vibrate when the substance is heated, and the shape of the substance begins to form a different shape. For example: when you hear up metal it will melt becuase its molecules are changing and moving.

8 0
3 years ago
Read 2 more answers
How many liters are there in 28g of B?
Juliette [100K]
Hi
The volume is 58.1
The moler mass is 10.8
Molar mass details
10.81B (1*10.81)

Hope this helps
5 0
3 years ago
The solid has a mass of 180g. What is the density of the solid?
xxTIMURxx [149]
To find density we have to know the values of density and mass. Here mass is given which i 180g.
we know the formula to find the density is:
Density = Mass / volume
so the density will be 180 / volume = 180g per unit volume
if we know the volume, we can find exact value of density.
5 0
4 years ago
Hydrochloric acid and sodium hydroxide will produce which two compounds
wel
They cancel each other out so they are neutral.
5 0
3 years ago
Other questions:
  • If you keep buying despite a price increase, your demand is what?
    12·2 answers
  • A 6.60 g sample of solid KCl was dissolved in 47.6 g of water. The initial temperature of the water was 20.00°C. After the compo
    13·1 answer
  • What type of rock is pumice? Describe how a pumice rock is likely to change over a long period of time.
    5·1 answer
  • Examples of quantitative of quantitative data
    6·2 answers
  • Which type of molecule is shown below?
    14·2 answers
  • What happens to acceleration when the mass goes up or down?
    13·2 answers
  • A solution with a molarity of 0.1850 contains 19.30 grams of BaCl2. What is the volume of the solution
    13·1 answer
  • Which statement about pure substances and molecules is correct?
    10·1 answer
  • Rock salt is a mixture of salt (sodium chloride) and sand. Describe how you would separate rock salt to obtain salt crystals and
    14·1 answer
  • Can someone please help me? :(
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!