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PolarNik [594]
3 years ago
15

Magnesium oxide is a binary ionic compound. From its formula, MgO, how do you know that Mg is the metal?

Chemistry
2 answers:
Vlad [161]3 years ago
8 0
Magnesium is a metal on the periodic table

leva [86]3 years ago
6 0
<h2>Answer:</h2>

<u><em>According to formula, magnesium gives electron forming a cation which is the property of metals according to periodic table.</em></u>

<h3>Explanation:</h3>
  • Mg has a valency of two electrons which means it has two electron in the valence shell. It gives two electrons to an oxygen atom which becomes a anion.
  • They form two ionic bond forming MgO.
  • And the atoms of valency two are present in 2nd column which contains metals.
  • Hence from formula, it can be known that Mg is a metal.









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The contact angle for water on paraffin is 106 degrees at 25 °C. Calculate the work of adhesion and cohesion and the spreading c
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Explanation:

When two immiscible liquids are separated out at their boundary when they are present in two sections then there occurs an increase in their surface energy and it is known as work of adhesion.

It is given that contact angle for water on paraffin is 106^{o} and temperature is 25^{o}C.

                     w_{a} = \sigma (1 + Cos \Theta)

where,       \Theta = contact angle

                  \sigma = surface tension for water

Here, the two immiscible liquids are water and paraffin. Also, it is known that at 25^{o}C, \sigma_{water} is 72 dynes/cm.

Hence, work of adhesion will be calculated as follows.

                      w_{a} = \sigma (1 + Cos \Theta)

                                       = 72 (1 + Cos (106^{o}))

                                        = -19.84 dynes/cm

Hence, the work of adhesion is -19.84 dynes/cm.

When we separate out a column of pure liquid into two halves then there occurs an increase in free energy. This is known as cohesion.

Expression for work of cohesion is given as follows.

                            w_{c} = 2 \sigma_{water}

                                      = 2 \times 72

                                      = 144 dynes/cm

Hence, the work of cohesion is 144 dynes/cm.

The difference between work of adhesion and work of cohesion is known as spreading coefficient.

                       S = w{a} - w_{c}

                          = -19.84 dynes/cm - 144 dynes/cm

                           = - 163.84 dynes/cm

Hence, the spreading coefficient is  - 163.84 dynes/cm.

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