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raketka [301]
3 years ago
8

Arrange the elements in decreasing order of first ionization energy.

Chemistry
1 answer:
just olya [345]3 years ago
5 0

Answer:

The decreasing order of first ionization energy: Se > Ge > In > Cs

The decreasing order of first ionization energy: x > y > z

Explanation:

Ionization energy refers to the energy needed to completely pull out an electron from the valence shell of a neutral gaseous atom.

First ionization energy is the energy involved in the removal of first valence electron.

<u><em>In the periodic table, down the group, as atomic radius of elements increases, the ionization energy decreases </em></u>

<u><em>Whereas, across a period, as atomic radius of elements decreases, the ionization energy increases.</em></u>

PART (A):

Position of the given elements in the periodic table:

Indium (In): Group 13, period 5

Germanium (Ge): Group 14, period 4

Selenium (Se): Group 16, period 4

Caesium (Cs): Group 1, period 6

Thus, the increasing order of atomic radius: Se < Ge < In < Cs

<u>Therefore, the decreasing order of first ionization energy: </u><u>Se > Ge > In > Cs</u>

PART (B):

Given elements:

element x: radius = 110 pm

element y: radius = 199 pm

element z: radius = 257 pm

Thus, the increasing order of atomic radius: x < y < z

<u>Therefore, the decreasing order of first ionization energy:</u><u> x > y > z</u>

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Answer:

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Explanation:

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What sort of relationship is there between the molarity and the absorbance? What evidence is there for this claim?
nasty-shy [4]

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8 0
3 years ago
An object of mass 10.0 kg is initially at rest. A 100 N force causes it to move horizontally through a distance of 6.00 m. What
TEA [102]

Answer:

The answer to the question is

The change in the kinetic energy of the object is 600 J

Explanation:

The known variables are,

Mass of object, m = 100 kg

Force of object, F = 100 N

The relation for kinetic energy = KE = \frac{1}{2} * m * v^{2} = 0.5·m·v²

Therefore to find v we first find the acceleration from

F = m·a =10.0 kg × a = 100 N,

Where a = acceleration of the object =100/10 = 10 m/s²

To find the velocity, v, we use the relationship

v² = u² + 2 × a × S, where S is the distance of motion = 6.00 m and u is the initial velocity, u = 0 m/s, therefore

v² = 0 + 2 × 10 m/s² × 6 m = 120 m²/s² or v = 10.95 m/s

Therefore KE = 0.5 × 10 kg × (10.95 m/s)² = 600 J

where the initial velocity, u = 0 m/s

Initial kinetic energy of the object = KE₁ = 0.5 × 10 × 0² = 0

The change in kinetic energy of the object = 600 J - 0 J = 600 J

5 0
3 years ago
What mass of LiO is needed to react with 1,060 g of CO2?<br>​
svlad2 [7]

Mass of Li₂O= 719.809 g

<h3>Further explanation</h3>

Given

1,060 g of CO₂

Required

Mass of Li₂O

Solution

Reaction

<em>Possible compound : Li₂O </em>

Li₂O(aq) + CO₂(g) → Li₂CO₃(aq)

mol CO₂(MW=44 g/mol) :

= 1,060 g : 44 g/mol

= 24.09

From the equation, mol ratio of LiO : CO₂ = 1 : 1, so mol Li₂O : 24.09

Mass Of Li₂O(MW=29.88 g/mol) :

= mol x MW

= 24.09 x 29.88

= 719.809 g

6 0
2 years ago
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