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]2 years ago

8 0

Magnesium is a metal on the periodic table

leva [86]2 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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Elimination of the pharmaceutical IV antibiotic gentamicin follows first-order kinetics. If the half-life of gentamicin is 1.5 h

Genrish500 [490]

Explanation:

The given data is:

The half-life of gentamicin is 1.5 hrs.

The reaction follows first-order kinetics.

The initial concentration of the reactants is 8.4 x 10-5 M.

The concentration of reactant after 8 hrs can be calculated as shown below:

The formula of the half-life of the first-order reaction is:

$k=\frac{0.693}{t_1_/_2}$

Where k = rate constant

t1/2=half-life

So, the rate constant k value is:

$k=\frac{0.693}{1.5 hrs}$

The expression for the rate constant is :

$k=\frac{2.303}{t} log \frac{initial concentration}{concentration after time "t"}$

Substitute the given values and the k value in this formula to get the concentration of the reactant after time 8 hrs is shown below:

$\frac{0.693}{1.5 hrs} =\frac{2.303}{8 hrs} x log \frac{8.4x10^-^5}{y} \\ log \frac{8.4x10^-^5}{y} =1.604\\\frac{8.4x10^-^5}{y}=10^1^.^6^0^4\\\frac{8.4x10^-^5}{y}=40.18\\y=\frac{8.4x10^-^5}{40.18} \\=>y=2.09x10^-^6$