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Rom4ik [11]
3 years ago
8

Mendeleev is the scientist who first developed

Chemistry
1 answer:
Schach [20]3 years ago
7 0
Dmitri Mendeleev is the scientist who first developed the periodic table.

He is a Russian chemist and inventor who formulated the periodic law and created the periodic table of elements. He corrected some of the properties of the elements. Now, we can easily locate the elements we wanted to identify. With the help of Mendeleev, studying chemistry is not that difficult because he tried to simplify some of the concept that was complex before.
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Niobium-91 has a half-life of 680 years. After 2,040 years, how much niobium-91 will remain from a 300.0-g sample? 3 g 18.75 g 3
Vadim26 [7]
Amount of Niobium-91 initially
= 300/91 =3.2967mol
2040 years = 3 ×680 = 3 half-lives
therefore, amount left = 0.4121mol
mass of Niobium-91 remaining = 0.4121 ×91 =37.5g
7 0
3 years ago
Read 2 more answers
.How many grams of NaCl required to form a 500ml solution with a molarity of 0.5M , the molar mass of NaCl is 58.5g/mol?
MaRussiya [10]
The answer will be 14.625
6 0
2 years ago
How many moles is in 2.52*10^24 molecules of water?
nataly862011 [7]
Hi friend
--------------
Your answer
-------------------

Water = H2O

Number of molecules in one mole of water = 6.022 × 10²³ [Avogadro's constant]

Given number of molecules = 2.52 × 10²³

So,
------

Number of moles =
\frac{2.52 \times 10 {}^{24} }{6.022 \times 10 {}^{23} }  \\  \\  = 4.184 \: (approximately)

HOPE IT HELPS
3 0
3 years ago
When an electr ic cur rent is passed through water , two colou r less gases are produced. When hydrogen gas makes a po pping sou
kumpel [21]

The lysis reaction with the formation of two different gases, and the synthesis reaction with the reaction of hydrogen and oxygen support that water is a compound and not an element.

<h3>What is electrolysis?</h3>

The electrolysis is the analytical process for the separation or the deposition of the element in the presence of the electric field.

The passing of electric current through water results in the release of two types of gases. Thus, it can be said that water lysis or breakdown forms the release of two elements hydrogen and oxygen supporting the fact that water is a compound and not an element.

The production of water is found to be formed with the reaction of hydrogen with oxygen. Thus it supports that water is a compound and, not an element.

Learn more about electrolysis, here:

brainly.com/question/12054569

#SPJ1

5 0
2 years ago
Identify which statement about a solution is correct. Group of answer choices The solution has the same physical state as the ph
zavuch27 [327]

Water can only be the solvent, never the solute is the statement about a solution that is correct.

  • The solute is the substance that, in general, is found in less quantity and that dissolves in the mixture.

  • The solvent, on the other hand, is the substance that usually appears in greater quantity and where the solute dissolves.

  • The most usual thing is that the solvent is the substance that establishes the physical state of the solution.

  • Water is considered a universal solvent, since it is the liquid that dissolves the most substances, a quality linked to its status as a “polar molecule”, this is due to its ability to form hydrogen bonds with other substances.

Solubility depends on the properties of a solvent that allow it to interact with a solute in a stronger way than the solvent particles do with each other.

In particular, the polar character of water makes it an excellent solvent for polar and ionic solutes, which are called hydrophilic.

Therefore, we can conclude that water can only be the solvent, never the solute is the statement about a solution that is correct.

Learn more here: brainly.com/question/2835889

5 0
2 years ago
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