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Vera_Pavlovna [14]
3 years ago
14

The periodic table and how to use?

Chemistry
1 answer:
jeka57 [31]3 years ago
4 0
So let’s say someone asks you what what element has an atomic mass of 190.23 in period 6 so it would be Osmium and the metals are Alkali Alkaline Earth Other metals transition metals inner transition metals lanthanoids actinides rare earth elements metalloids semimetals nonmetals halogens noble gases newly recognized elements those are how the elements are sorted the atomic number is how high or low something is like 43 61 84 through 118 is radioactive and atomic symbols like Pb stands for lead or Cr stands for Chromium so you should know how to use some parts of the periodic table this is all I know if you already knew this then I’m sorry

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In an equimolar mixture of o2 and n2, are the mass fractions equal?
nika2105 [10]

Answer:

No

Explanation:

The mass fraction is defined as:

w_{i}=\frac{m_{i} }{m_{t} }

where:

  • wi: mass fraction of the substance i
  • mi: mass of the substance i
  • mt: total mass of the system

<u><em>The mass fraction of two substances (A and B), will be the same, ONLY if the mass of the substance A (mA) is the same as the mass of the substance B (mB).</em></u>

An equimolar mixutre of O2 and N2 has the same amount of moles of oxygen and nitrogen, just to give an example let's say that the system has 1 mole of O2 and 1 mole of N2. Then using the molecuar weigth of each of them we can calculate the mass:

mA= 1 mole of O2 * 16 g/1mol = 16 g

mB=1 mole of N2 *28 g/1mol=28 g

As mA≠mB then the mass fractions are not equal, so the answear is NO.

4 0
3 years ago
What happens during mitosis?
Ludmilka [50]
A eukaryotic cell goes through nuclear division creating two identical daughter cells.
6 0
3 years ago
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What are two bones that make blood cells.<br><br> (name of the bones) :)
lesantik [10]

Answer:

Long bones contain yellow bone marrow and red bone marrow, which produce blood cells.

Explanation:

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5 0
2 years ago
How can you estimate the pH range of an indicator’s color change? Why do some indicators have two separate pH ranges?
erastova [34]

The color change of a pH indicator is caused by the dissociation of the H+ ion from the indicator.

<h3 /><h3>What is indicator?</h3>

In science, a marker capability or a trademark capability of a subset An of a set X is a capability characterized from X to the two components set {0, 1}, normally signified as, and it demonstrates whether a component in X has a place with A. Markers are insights used to gauge current circumstances as well as to figure monetary or financial patterns. In the realm of money management, pointers regularly allude to specialized diagram designs getting from the value, volume, or open revenue of a given security. Markers are insights used to gauge current circumstances as well as to conjecture monetary or financial patterns. In the realm of money management, pointers normally allude to specialized graph designs getting from the value, volume, or open revenue of a given security.

Learn more about indicator, visit

brainly.com/question/11422436

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4 0
1 year ago
An atom of nitrogen has seven electrons. Which diagram correctly represents the arrangement of these electrons?
gizmo_the_mogwai [7]

Answer:

Option C.

Explanation:

The arrangement of electrons in their orbital follows certain rules.

The Hund's rule practically explained how electrons are distributed in their orbitals.

The Hund's rule states that electrons distributed among the orbitals of the same shell singly (without partner) before pairing occurs.

In the filling of these electrons in their orbitals, we fill in the electron without pairing first because electrons tends to repel each other before filling with the opposite spin as shown in the attached photo.

8 0
3 years ago
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