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nikitadnepr [17]
3 years ago
5

Of the molecules below, only ________ is polar.a. SiCl4 b. CH4 c. CCl4 d. SeF4

Chemistry
1 answer:
ludmilkaskok [199]3 years ago
6 0

Answer:

SeF4 is a polar molecule

Explanation:

SeF4 is a polar molecule because a polar molecule is any molecule that have lone pairs of electrons in the central atom or have atoms that are electronegative and the electrons between that are covalently bonded are not evenly distributed.

The electronegative atoms of flourine in SeF4 are not evenly distributed and kind pairs of electrons are on the central atom.

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Using your value of Ksp, and starting with an equilibrium system consisting of a saturated solution of calcium hydroxide, predic
Ugo [173]

Answer:

(A) HNO_{3} Solubility will increase.

(B) NaOH Solubility will decrease.

(C) Ca(NO_{3} )_{2} Solubility will decrease.

Explanation:

a) According to Le Chatelier's Principle when a change is introduced in a reaction system at equilibrium, the system responds by the reaction shifting in the direction to counter the change introduced.

When the change introduced is addition of acid, some OH^{-} are consumed due to it and the system would respond by reaction shifting towards creation of more OH^{-} in the system by increased dissolution. Thus solubility increase.

(b) When OH^{-} are added, the reaction shifts to counter the change introduced of increased OH^{-} by shifting to side that decreases the increased OH^{-}. That happens by reaction shifting towards some Ca (OH)_{2} precipitating back. Hence solubility decreases.

(c) The change introduced is addition of Ca^{2+} which will be countered by reaction shifting to side that decreases increased Ca ^{2+}, which happens by some Ca(OH)_{2} precipitating back. Hence solubility decreases.

6 0
4 years ago
How can you tell if a chemical is an ionic bond?
Klio2033 [76]
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8 0
3 years ago
A 40.4 g sample of a protein contains 17.16 g of carbon, 3.17 g of hydrogen, 13.71 g of oxygen, and the rest being nitrogen. Thi
lukranit [14]
<h3>The molecular formula of this protein : C₁₈H₄₂O₁₂N₆</h3><h3>Further explanation  </h3>

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

The principle of determining empirical formula and molecular formula  

  • Determine the mass ratio of the constituent elements of the compound.  
  • Determine the mole ratio by dividing the elemental mass with the relative atomic mass obtained by the empirical formula  
  • Determine molecular formulas by looking for values of n  

Find mol ratio for every component :

  • C (Ar=12 g/mol):

\tt \dfrac{17.16}{12}=1.43

  • H(Ar=1 g/mol) :

\tt \dfrac{3.17}{1}=3.17

  • O(Ar=16 g/mol) :

\tt \dfrac{13.71}{16}=0.857

N (r=14 g/mol) :

Mass of Nitrogen :

40.4-(17.16+3.17+13.71)=6.36 g

  • N :

\tt \dfrac{6.36}{14}=0.454

C : H : O : N = 1.43 : 3.17 : 0.857 : 0.454 = 3.15 : 7 : 1.89 : 1=3:7:2:1

Empirical formula : C₃H₇O₂N

Molecular mass of protein :

\tt \dfrac{40.4}{0.07141}=565.75

(C₃H₇O₂N)n=565.75

(12.3+1.7+2.16+14)n=565.75

(89)n=565.75

n=6.4≈6

so the molecular formula : C₁₈H₄₂O₁₂N₆

6 0
3 years ago
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