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earnstyle [38]
3 years ago
7

PLEASE HURRY WILL MARK BRAINLIEST !!!!!!!!!!!

Chemistry
2 answers:
Reptile [31]3 years ago
6 0

The answer on Edge is <u>arsenic (As).</u>  (:

Alla [95]3 years ago
3 0
The answer would be Arsenic (As).

An electron-dot diagram is a graphical representation of the valence electrons of a certain element. The chemical symbol of an element placed in the middle and the valence electrons are represented by dots. The number of dots is equal to the number of valence electrons. 

So in your illustration, you can see that there are 5 dots all in all. This indicates that this mystery element has 5 valence electrons. Elements in Group 5A or the Nitrogen Group.

Among the choices, only Arsenic is under Group 5A.   
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Answer:

Chemical Change

Explanation:

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How did scientists refute the early atomic theory claim that atoms were indivisible?
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After centrifugation of the sample, the student was not careful and some of the solid was transferred to the Erlenmeyer flask al
Tju [1.3M]

The fact that some of the solid was transferred would decrease the mass of the limiting reactant.

<h3>What is the limiting reactant?</h3>

We know that in a chemical reaction, there are at least two substances that are combined in order to give the product of the reaction. We also know that the product that we obtain must be in accordance to the stoichiometry of the reaction.

It is common to see that one of the reactants would be present in a very large amount while the other reactant would be present only in quite a small amount. The reactant that is present in a small amount is said to be the limiting reactant while the one that is present in the large amount is said to be the reactant that is in excess.

Having said this, we know that the mass of the limiting reactant can be obtained from the mass of the solid that is obtained after the reaction.

If we do not take out all of the solid from the centrifuge, the mass would not be accurately weighed and the mass of the limiting reactant would not be accurately determined.

Learn more about mass of the product:brainly.com/question/19694949

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5 0
1 year ago
How many moles are in 1.806 x 1024 molecules of bromine?
Pepsi [2]
<h3>Answer:</h3>

2.999 mol Br

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
<h3>Explanation:</h3>

<u>Step 1: Define</u>

1.806 × 10²⁴ molecules Br

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

<u />\displaystyle 1.806 \cdot 10^{24} \ molecules \ Br(\frac{1 \ mol \ Br}{6.022 \cdot 10^{23} \ molecules \ Br} ) = 2.999 mol Br

<u>Step 4: Check</u>

<em>We are given 4 sig figs. Follow sig fig rules and round.</em>

Our final answer is already in 4 sig figs, so there is no need to round.

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