CHEMISTRY HIGH SCHOOL

Uses a special type of paper to separate liquids based on their different densitiesa. filtration
b. distillation
c. crystallization
d. chromatography

Answers

Answer 1
Answer: chromatography hope it works!

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What are three types of fossil fuels?

Answers

The three types of fossil fuels are coal, oil and natural gas.

How does the human eye see objects?A.
Light absorbed by objects, enters the eyes, and is refracted by the optic nerve in the retina.

B.
Light reflects off objects, enters the eyes, and is detected by the optic nerve in the retina.

C.
Light refracts off objects, enters the eyes, and is captured as a photograph by the lenses.

D.
Light reflects off objects, enters the eyes, and is detected by light-sensitive cells in the retina.

Answers

The human eye see objects through light reflects off objects, enters the eyes, and is detected by the optic nerve in the retina. The answer is letter B. The rest of the choices do not answer the question above.

What is the molarity of a 0.30 liter solution containing 0.50 mo les of NaCI

Answers

Number of moles NaCl = 0.50

Volume = 0.30 L

M = n / V

M = 0.50 / 0.30

= 1.667 M

hope this helps!

How are journals helpful to scientists

Answers

They help keep track of notes and experaments

How can you tell when a solution is formed?

Answers

You may tell when a solution os formed when the item or particle, such as sugar or salt,
dissolves completely in the solvent, such as water. 

Basically, you know when a solution is formed when the material you have placed in the solvent disappears :P
When the solute is completely dissolved into the solvent.

Which element has the same number of energy levels as krypton (Kr) and the same number of valence electrons as nitrogen (N) ? iron (Fe)
selenium (Se)
arsenic (As) c
alcium (Ca)

Answers

Answer:

The correct answer is the option: arsenic (As).

Explanation:

Hello!

Let's solve this!

Nitrogen is in group V period 2 and has 5 valence electrons.

The krypton is in period 4.

If we cross these two elements, the element that is in the same group as nitrogen (V) and in the same period as Kripton (4) is Arsenic. If you have any questions, we can check it on the periodic table.

We conclude that the correct answer is the option: arsenic (As).

Answer:

The answer to your question is: Arsenic (As)

Explanation:

Krypton is a noble gas located in group VIII A and 4rd period. Nitrogen is in the 5fh group.

So, we must look for an element located in the 4rd period and group VA.

Iron (Fe)               Iron is in the 4rd period and group VI B

Selenium (Se)     Selenium is in the 4rd period and group VI A

Arsenic (As)       Arsenic is in the 4rd period and group V A and group VA

Calcium (Ca)     Calcium is located in group 4rd and group IIA
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