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DIA [1.3K]
4 years ago
15

Mendeleev’s table of elements was better accepted than those of other scientists at the time because _______________ . Moseley w

ent a step further in suggesting that the elements be arranged according to________________ .
Chemistry
2 answers:
disa [49]4 years ago
8 0

Answer:Answer: Mendeleev's table of elements was better accepted than those of other scientists at the time because it predicted correctly the properties of elements that had not yet been discovered. Moseley went a step further in suggesting that the elements be arranged according to atomic number

Explanation:

Dmitrij [34]4 years ago
5 0

Answer:

Mendeleev’s table of elements was better accepted than those of other scientists at the time because he discovered the elements that had not yet been discovered. Moseley went a step further in suggesting that the elements be arranged according to atomic number

Atomic number

Explanation:

He arranged the elements based in groups.

He left spaces for the elements yet to be discovered. His assumptions were true as the elements were actually discovered later on

The properties of such elements were also well matched as based on their position in the periodic table.

He corrected some of the incorrect masses predicted by then.

The modern periodic table is based on periodic trend on atomic number.

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A 0.050 MM solution of AlCl3 had an observed osmotic pressure of 3.85 atmatm at 20 ∘C . Calculate the van't Hoff factor iii for
alekssr [168]

Answer:

The van't Hoff factor = 3.20

Explanation:

Step 1: data given

Osmotic pressure of a 0.050 M Solution is 3.85 atm

Temperature = 20.0 °C

Step 2:

Osmotic pressure depends on the molar concentration of the solute but not on its identity.

We can calculate the osmotic pressure by:

π = i.M.R.T

 ⇒ with π = osmotic pressure = 3.85 atm

 ⇒ with i = van 't Hoff factor  = TO BE DETERMINED

 ⇒ with M = molar concentration of the solution =0.050 M

 ⇒ with R = gas constant =0.08206 L * atm / mol* K)

  ⇒ with T = Temperature of the solution =20°C = 293 K

i = π / M.R.T

i = 3.85 / 0.050*0.08206*293

i = 3.20

The theoretical Van't Hoff factor is 4:

AlCl3(aq) → Al^3+(aq) + 3Cl^-(aq)

AlCl3 dissociates in 1 mol Al^3+ + 3 moles Cl-

Due to the interionic atractions the Van't hoff factor is less than the theoretical value of 4

8 0
4 years ago
What are the purposes of a chemical equation? Check all that apply.
Jlenok [28]

Answer:

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to shorten the explanation of a chemical reaction

to help keep track of atoms in a chemical reaction

Explanation:

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3 years ago
How many grams of Al2O3 are produced from 4.2 grams of of Al reacting with O2?
butalik [34]

Answer:

1400

Explanation:

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Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs
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Answer:

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2 years ago
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