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Nitella [24]
3 years ago
14

Place the following elements in order of increasing electronegativity. Ba O Li Place the following elements in order of increasi

ng electronegativity. Ba O Li Ba < O < Li Li < O < Ba O < Li < Ba O < Ba < Li Ba < Li < O
Chemistry
1 answer:
Elenna [48]3 years ago
4 0

Explanation:

It is known that electronegativity is the ability of an atom to attract electrons towards itself in order to attain stability. Generally, non-metals are electronegative in nature.

When we move from left to right in a periodic table then there will occur an increase in the electronegativity of the atoms.

Lithium (Li) is an alkali metal and it is highly electropositive in nature.

Barium (Ba) is an alkaline earth metal and it is also electropositive in nature. Also, it is placed gown in group 2 so it will readily lose electrons in order to gain stability.

Oxygen (O) is a group 16 element and it is a non-metal which is electronegative in nature.

Thus, we can conclude that order of increasing electronegativity for the given elements is as follows.

                                Ba < Li < O

               

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What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.3×1015Hz?
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Answer:

We know that

ħf = ф + Ekmax  

where  

ħ = planks constant = 6.626x10^-34 J s  

f = frequency of incident light = 1.3x10^15 /s (1 Hz =

1/s)

ф = work function of the cesium = 2.14 eV  

Ekmax = max  kinetic energy of the emmitted electron.  

We distinguish that:

1 eV = 1.602x10^-19 J

So:

2.14 eV x (1.602x10^-19 J / 1 eV) = 3.428x10^-19 J

So,

Ekmax = (6.626x10^-34 J s) x (1.3x10^15 / s) - 3.428x10^-19 J

= 8.6138x10^-19 J - 3.428x10^-19 J = 5.1858x10^-19 J  

Answer:

5.19x10^-19 J  

Kinetic energy:

In physics, the kinetic energy of an object is the energy that it owns due to its motion. It is defined as the work required accelerating a body of a given mass from rest to its specified velocity. Having expanded this energy during its acceleration, the body upholds this kinetic energy lest its speed changes.

Answer details:

Subject: Chemistry

Level: College

Keywords:

• Energy  

• Kinetic energy

• Kinetic energy of emitted electrons

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Calculate the ph of a solution formed by mixing 200.0 ml of 0.30 m hclo with 300.0 ml of 0.20 m kclo. the ka for hclo is 2.9 × 1
velikii [3]
C(HClO) = 0,3 M.
<span>V(HClO) = 200 mL = 0,2 L.
n(HClO) = </span>c(HClO) · V(HClO).
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c(KClO</span>) = 0,2 M.
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cs(KClO) = 0,06 mol ÷ 0,5 L = 0,12 M.<span>
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pH = 7,54 + 0.
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