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miss Akunina [59]
3 years ago
10

If you look at the periodic table today which elements would best represent a triad as predicted by Dobereiner?

Chemistry
1 answer:
777dan777 [17]3 years ago
8 0

Answer:  B. Nickel Copper Zinc

Explanation:

Dobereiner's triads was a group of three elements. Dobereiner said that the relative atomic mass of the middle element in each triad was average of the relative atomic masses of the other two elements.

Thus if A, B and C forms Dobereiner's triads, the mass of B is average of mass of A and C.

A. Hydrogen Oxygen Nitrogen:

mass of oxygen = 15.999

mass of oxygen according to Dobereiner = \frac{1.008+14.007}{2}=7.5075

B. Nickel Copper Zinc

mass of copper = 63.5

mass of copper according to Dobereiner = \frac{58.7+65.38}{2}=62.04

C. Aluminum Gallium Indium

mass of gallium = 69.72

mass of gallium according to Dobereiner = \frac{26.98+114.82}{2}=84.39

D. Neptunium Plutonium Americium

mass of Plutonium = 244

mass of Plutonium according to Dobereiner = \frac{243+237.04}{2}=240.02

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Change in boiling point: ΔT =i · Kb · b.

Kb - molal boiling point elevation constant of water is 0.512°C/m, this the same for both solution.

b -  molality, moles of solute per kilogram of solvent., this is also same for both solution, because ther is same amount of substance.

i - Van't Hoff factor.

Van't Hoff factor for sugar solution is 1, because sugar do not dissociate on ions.

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<h2>Hydrogen Bonding</h2>

Explanation:

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