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aliya0001 [1]
3 years ago
15

What is the valency ?write the valencies of the calcium, Iron, hydroxyh​ ,Nitrate

Chemistry
1 answer:
Natasha_Volkova [10]3 years ago
3 0

Answer:

(a):Valency is the measure of the capacity of an atom of a single element to react and combine with particular numbers of atoms of another element.

(b):

Valency of calcium:+2

Valency of Iron:Iron exhibits 2 valence states of +2 and +3.

Valency of hydroxl:-1

Valency of Nitrate:-1

Explanation:

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lisabon 2012 [21]

Answer:

The answer is B.

Explanation:

Trust me i took the test already its b.

6 0
3 years ago
Exploring the Second Law
san4es73 [151]

Answer:

(a) The coefficient of performance of an irreversible refrigeration cycle is always less than the coefficient of performance of a reversible refrigeration cycle when both exchange energy by heat transfer with the same two reservoirs.

Explanation:

According to the  Kelvin–Planck statement of the second law of thermodynamics ,it is not possible to construct a device which operates in cycle and does not produce effect on the environment than the production of work.

We know that

Coefficient of performance is the ratio of desired effect to the work input in a cycle.

Given all option is correct but most appropriate option is a.

So the option a is correct

(a) The coefficient of performance of an irreversible refrigeration cycle is always less than the coefficient of performance of a reversible refrigeration cycle when both exchange energy by heat transfer with the same two reservoirs.

5 0
3 years ago
The empirical formula of a group of compounds is CHCl. Lindane, a powerful insecticide, is a member of this group. The molar mas
Sergeeva-Olga [200]

Answer:

<h2>D) 6</h2>

Explanation:

since,   n = molar mass / empirical formula mass

   Empirical formula mass = Total mass of atoms present in empirical formula

                       CHCl = 12+1+35.5

                                = 48.5

 Given, Molar mass = 290.8 g.

           So,        n = 290.8/48.5

                           = 5.995 , that is approx  6.

        So, Molecular formula = n × Empirical formula

                                           = 6 × CHCl

                                           = C_{6}H_{6}Cl_{6}

       So,   Number of C = 6

3 0
3 years ago
Explain what is wrong with this statement: “The density of a heavy bar of pure gold is greater than the density of a small ingot
VladimirAG [237]

Answer:

Both densities would be equal.

Explanation:

since both the bar and the ingot are pure gold, they would have the same density, despite the amount.

5 0
3 years ago
How can valid conclusions from the growth rate calculations be applied in a biotechnological or biomedical context ?
Igoryamba
Growth rate calculations and their conclusions can be used in biomedical contexts when organisms are being grown for the synthesis of compounds or other purposes. 
7 0
3 years ago
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