An ether solution of PhCO2H (A), PhNH2 (B), and PhCH3 (C) is extracted with aqueous NaOH. The ether layer will contain what comp

Your Question: There are two kinds of elements that didn't appear on the periodic table until after 1892. What kinds are they and why do you think it took so long to discover them?

The Answer: The insights of Moseley led chemists to further refine the periodic table and uncover additional gaps, indicating that several new elements, specifically with atomic numbers 43, 61, 72, and 75, remained undiscovered. These elements were later identified as technetium, promethium, hafnium, and rhenium, respectively.

Explanation: Physicist Henry Moseley used x-rays to determine the atomic number of elements, which facilitated a more accurate organization of the periodic table. His life and the discovery of the correlation between atomic number and x-ray frequency, known as Moseley's Law, are significant to note.

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Result:

I believe it’s called Trinitrogen Pentaseleniumide

Explanation:

Tri means three

Penta means five

The second element concludes with -ide

Answer:

The flask yielding the greatest amount of product is the second flask.

The water molecules produced are

Explanation:

From the prompt we learn that

The chemical reaction is

2CH3OH(l) + 3O2(g)⟶4H2O(g)+2CO2(g)

The first flask contains 3 molecules of C H 3 O H and 3 molecules of O 2

The second flask has 1 molecule of C H 3 O H and 6 molecules of O 2.

The third flask consists of 4 molecules of C H 3 O H and 2 molecules of O 2.

Analyzing the three flasks, it's evident that the flask producing the most considerable total product is the second one.

According to the balanced equation, 2 moles of C H 3 O H react with 3 moles of oxygen, making O 2 the limiting reagent.

Generally, one mole of any substance is of that substance.

Here, represents Avogadro's number valued at .

As seen in the balanced equation, 3 moles of O 2 (3 * molecules of O 2) yield 4 moles of H2O (4 *

Thus, 6 molecules of O 2 would generate X molecules of H 2 O.

So

=>

Answer: The correct choice is that they represent different concentration units.

Explanation:

Molarity: Defined as the quantity of solute moles in a liter of solution.

Molarity formula:

Mass percent: Represents the mass of solute relative to the total mass of the solution.

Mass percent formula:

This demonstrates that they are distinct units of concentration.