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Gre4nikov [31]
2 years ago
14

Of the following elements, which is the LEAST reactive? A. C B. H C. Li D. He

Chemistry
2 answers:
Semenov [28]2 years ago
8 0

Answer:

<u><em>Definitely D: Helium</em></u>

Explanation:

The Electronegativity or pauling is its reactivity, aka the more likely it is to steal an electron. so if it doesnt have ANY reactivity like helium, there is no chance it will steal one. therefore its helium.

Mashcka [7]2 years ago
4 0

The least reactive elements are the noble gases since they have a full valence shell and thus require a lot of energy in order to form bonds.
For metals, reactivity increases as you move down a group and as you move leftward within a period.
The trend within a period is due to the increase in ionization energy caused by the decrease in electrons needed to be lost in order for an element achieve a full valence electron shell. The trend within a group is due to the valence shell being further away from the nucleus, resulting in less attractive forces and thus less energy needed for reaction.

For nonmetals, the trends are reversed. Reactivity as you move up a group and as you move rightward within a period.
As you move up a group, the element increases in electromagnetism and thus increasing its reactivity. As you move across a period, there is less electrons needed to be received in order for the element to achieve a full valence shell
hope this helps hun
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An aluminum block has a density of 2.70 g/mL. If the mass of the block is 24.60 g, find the volume of the substance.
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Volume of a substance can be determined by dividing mass of the substance by its density.

That can be mathematical shown as:

Density=Mass/Volume

So, Volume=Mass/Density

Here mass of the substance given as 24.60 g

Whereas density of the substance is 2.70 g/mL

So,

Volume=Mass/Density

=24.6/2.7

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So volume of the substance is 9.1 mL.

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3 years ago
Use the information to answer the following question.
jolli1 [7]
I think the answer is c
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natta225 [31]

Answer:

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(b) Between tetrabromomethane (CBr₄) and chloroform (CHCl₃), the substance with the higher surface tension is chloroform (CHCl₃)

Explanation:

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(b) Between tetrabromomethane (CBr₄) and chloroform (CHCl₃), the substance with the higher surface tension is chloroform (CHCl₃)

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1-H NMR spectroscopy tool will be used for distinguishing a sample of 1,2,2-tribromopropane from 1,1,2-tribromopropane.

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It can be calculated by simply counting the number of unique hydrogens on one side of the symmetry plane will give you the count of signals individual molecules emit in a 1H NMR spectrum.

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To know more about 1-H NMR spectroscopy

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