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nadezda [96]
3 years ago
8

In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using? c

hromatography distillation filtration fragmentation condensation
Chemistry
2 answers:
Tom [10]3 years ago
4 0
Filtration, he used a mesh to filter out the stuff
anyanavicka [17]3 years ago
4 0

Answer: Option (c) is the correct answer.

Explanation:

A mesh is a kind of net like structure generally used for the purpose of filtration.

Distillation is defined as the method used to separate two liquids with a difference of less than or around 25^{o}C in their boiling point.  

So, a liquid with low boiling point will evaporate and its vapors can be collected in a separate container.

Chromatography is defined as a method for separating a mixture by passing it in a solution with the help of a medium where the components of the mixture travel at different rates.

And, filtration is a method used to separate a solid from a liquid by passing through a porous barrier. The solid remain stick to the barrier and liquid passes through the barrier.

A method in which a solid substance is broken down into different parts or fragments is known as fragmentation.

Condensation is a process is in which vapor phase of a substance changes into liquid phase.

Thus, we can conclude that in the given situation John is using the technique of filtration.

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Explanation:

1. Explain how groups 1A-8A in the periodic table are organized by their number of valence electrons.

The valence electrons in an atom are the outermost shell electrons. They are the most loosely held electrons in an atom.

Coincidentally, the periodic table of elements divided into vertical groups and horizontal periods can be said to be arranged according to the number of valence electrons.

  • Atomic numbers are used to arrange elements on the periodic table.
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  • Down a group electronic shell increases but the number of valence electrons are the same.
  • All elements in Group 1A has just one valence electrons, Group 2A has two valence electrons.........Group 8A has eight valence electrons.
  • Moving across groups is synonymous to moving from left to right on the periodic table.
  • Due to this trend, the periodic table is arranged based on the number of valence electrons.

3. explain how you know the number of valence electrons for each group.

The number of valence electrons in a group is the group number:

   Group      Number                     valence electrons

              1A                                                 1

              2A                                                2

              3A                                                 3

              4A                                                 4

               5A                                                5

               6A                                                6

               7A                                                7

               8A                                                8

learn more:

Periodic table brainly.com/question/1971327

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3 years ago
If in the following diagram the substance is in the solid state during stage 1, what is happening during stage 2?
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The final solution must have 2 mL and a concentration of 350 pg/mL, and the initial solution has a concentration of 50 pg/mL.

Then:

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Answer:

Explanation:

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