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saul85 [17]
3 years ago
15

PLS HELP ME, use the periodic table to write the electron configuration of selenium

Chemistry
1 answer:
EastWind [94]3 years ago
6 0

Answer:

[Ar] 3d10 4s2 4p4

Explanation:

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4

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Number 14 please help.. chemistry
Zolol [24]

Taking into account the definition of density, the mass of a substance with a volume of 150 cm³ and a density of 1.5 \frac{g}{cm^{3} }  is 225 grams.

<h3>What is density</h3>

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density=\frac{mass}{volume}

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

<h3>Mass of the substance in this case</h3>

In this case, you know that:

  • Density= 1.5 \frac{g}{cm^{3} }
  • Volume= 150 cm³

Replacing in the definition of density:

1.5 \frac{g}{cm^{3} } =\frac{mass}{150 cm^{3} }

Solving:

mass= 1.5 \frac{g}{cm^{3} }  ×150 cm³

<u><em>mass= 225 g</em></u>

In summary, the mass of a substance with a volume of 150 cm³ and a density of 1.5 \frac{g}{cm^{3} }  is 225 grams.

Learn more about density:

brainly.com/question/952755

brainly.com/question/1462554

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7 0
2 years ago
If you had 100 grams of wax(C25H52), predict...
marissa [1.9K]

Answer:

2 i think should be the correct answer

Explanation:

4 0
3 years ago
How will the boiling point of a liter of water containing 1 mole of sodium chloride (NaCl) compare with that of a liter of water
Alex Ar [27]
The boiling point of the calcium chloride CaCl2 solution will be higher than that of the boiling point of the sodium chloride NaCl solution, because more molecules are present in the CaCl2 solution since CaCl2 dissociates into three ions while NaCl only dissociates into two ions.
3 0
3 years ago
A certain element has a melting point over 700 ∘C and a density less than 2.00 g/cm3. What is one possible identity for this ele
Tom [10]
<span>  The element is Beryllium</span>
6 0
3 years ago
Read 2 more answers
Calculate the percent dissociation of 4-chlorobutanoic acid C3H6ClCO2H in a 0.54mM aqueous solution of the stuff. You may find s
GrogVix [38]

Answer: The percent dissociation of 4-chlorobutanoic acid is 21%

Explanation:

The dissociation of weak acid is shown as:

C_3H_6ClCOOH\rightarrow C_3H_6ClCOO^-+H^+

          cM              0             0

         c-c\alpha        c\alpha         c\alpha

So dissociation constant will be:

K_a=\frac{(c\alpha)^{2}}{c-c\alpha}

Give c= 0.54 mM = 5.4\times 10^{-4}M and \alpha = ?

K_a=3.02\times 10^{-5}

Putting in the values we get:

3.02\times 10^{-5}=\frac{(5.4\times 10^{-4}\times \alpha)^2}{(5.4\times 10^{-4}-5.4\times 10^{-4}\times \alpha)}

(\alpha)=0.21

\%(\alpha)=0.21\times 100=21\%

Thus the percent dissociation of 4-chlorobutanoic acid is 21%

4 0
4 years ago
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