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Nataly [62]
3 years ago
11

Number the elements sodium, magnesium, phosphorus, and chlorine in the predicted order ionization energies from the highest to t

he smallest.
PLEASE HELP FAST!!!
Chemistry
2 answers:
Murrr4er [49]3 years ago
4 0
Chlorine              1
Phosphorus        2
Magnesium         3
Sodium               4
Alex3 years ago
3 0

The order  of  ionization energies  from  the highest  to smallest is as below

Chlorine -1 ( highest)

phosphorus -2

magnesium-3

sodium-4 (smallest)

<u><em>Explanation</em></u>

  • sodium, magnesium,phosphorus  and chlorine are in period  three in periodic table.

  • The trend of ionization energy across period 3 is that it increases across the period <em>( from the left to the right).</em>

  • The ionization energy increases  across the period 3 because  there are more protons  in each nucleus  which led to increase in nuclear  charge across the period<em>. ( from left to the right)</em>

  • This led to increase  in force  of attraction between nucleus and outer  electron<em>.( from the left to the right)</em>

  •  among the four element  given above from the left  of period 3  , Sodium is 1st element  followed  by magnesium, then phosphorus and then  chlorine.

  • Therefore since sodium is in left side it has the smallest ionization energy while chlorine has the highest ionization energy  since is is located at the fur right  of period  3.
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A chemist measures the enthalpy change ?H during the following reaction: Fe (s) + 2HCl (g) ? FeCl2 (s) + H2 (g) =?H?157.kJ Use t
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Correct Question:

A chemist measures the enthalpy change ΔH during the following reaction: Fe(s) + 2HCl(g)-->FeCl2(s) + H2 ΔH=-157.0 kJ. Use this information to complete the table below. Round each of your answers to the nearest kJ/mol

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The enthalpy change of a reaction measures the amount of heat that is lost or gained by it. If ΔH >0 the heat is gained, and the reaction is called endothermic, if ΔH<0, the heat is lost, and the reaction is called exothermic.

If the reaction is inverted, the value of ΔH is inverted too (the opposite endothermic reaction is exothermic), and if the reaction is multiplied by a constant, ΔH will be multiplied by it too.

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