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Luba_88 [7]
3 years ago
9

What amounts do you compare when measuring concentration

Chemistry
1 answer:
ozzi3 years ago
7 0

Answer:

  • <em>When measuring concentration you compare </em><u>the amount of solute to the amount of solvent or solution.</u>

Explanation:

The <em>concentration</em> is a measure of how much solute is present in certain amount of solvent or solution. There are many quantitative expressions for the concentration. Some of those expressions are: percentage, molarity, molality, molar fraction, among others.

This table shows the expressions for some concentration measures, showing the amounts compared.

<u>Concentration</u>                         <u>amounts compared in form of ratio</u>

Percentage, mass/mass         (mass of solute / mass of solution) × 100  

Percentage, vol./vol.                (vol. of solue / vol. of solution) × 100

Molarity                                     (moles of solute / liters of solution)

Molality                                      (moles of solute / Kg of solvent)

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The meselson-stahl experiment demonstrated that DNA replication is semi conservative in the figure semi conservative replication
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The correct answer will be option-D.

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Identify the neutral element represented by this excited-state electron configuration, then write the ground-state electron conf
sineoko [7]

Answer:

1s² 2s² 2p³

Nitrogen

Explanation:

Excited state configuration: 1s² 2s² 2p² 3s¹

Unknown:

Ground state configuration = ?

Element symbol = ?

Solution:

Let us start by understanding what a ground state configuration entails:

A ground state configuration shows the lowest allowed energy levels of an atom. The excited state denotes when electrons have moved to higher energy levels away from their ground state.

The superscript in the configuration depicts the number of electrons in each of the sublevels.

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In writing the electronic configuration of an atom, certain rules must be complied with.

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To fill the s-orbital = 2 electrons

                p-orbital = 6 electrons

The outermost shell electrons are usually the ones excited.

  Now, the 3s¹ shell is an excited one taking 1 electron from the second energy level;

 The ground state configuration is 1s² 2s² 2p³

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3 years ago
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