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3 years ago

What are isoelctronic species

Chemistry

1 answer:

BARSIC [14]3 years ago

6 0

Species that have the same number of electrons or the same electronic structure.

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What does the monomer unit of Polyester look like? And what’s its chemical formula?

AlladinOne [14]

Answer:

The monomers of polyesters are,

(i) A Dicarboxylic Acid

(ii) A Dialcohol

Explanation:

As depicted from name polyester is a macromolecule which contains numerous ester functional groups. Ester is formed by the condensation of Carboxylic acid and alcohol as shown,

R-COOH + R'OH → RCOOR' + H₂O

Therefore, in order to utilize this reaction for the formation of long chain of polyesters then one can use a dicarboxylic compounds and dialcohol compounds. This will allow to propagate the chain length depending upon the requirement. Hence, the general reaction for the formation of polyester is shown below. The circle and rectangle specifies different moieties which imparts different characters to the polyester.

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4 years ago

1.12 g of iron combines with 0.48 g of oxygen to form an oxide of

MArishka [77]

Answer:

OZ2 is the oxygen and DY5 is Dynamite

Explanation:

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2 years ago

Which question would most likely be studied by a chemist?

lbvjy [14]

Answer:

Explanation:

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4 years ago

Use bond energies to calculate ΔHrxn Δ H r x n for the reaction. 2H2(g)+O2(g)→2H2O(g) 2 H 2 ( g ) + O 2 ( g ) → 2 H 2 O ( g )

Olenka [21]

Answer:

$\large \boxed{\text{-486 kJ}}$

Explanation:

You calculate the energy required to break all the bonds in the reactants.

Then you subtract the energy needed to break all the bonds in the products.

2H₂ + O₂ ⟶ 2H-O-H

Bonds: 2H-H 1O=O 4H-O

D/kJ·mol⁻¹: 436 498 464

$\begin{array}{rcl}\Delta H & = & \sum{mD_{\text{reactants}}} - \sum{nD_{\text{products}}}\\& = & 2 \times 436 +1 \times 498 - 4 \times 464\\&=& 1370 - 1856\\&=&\textbf{-486 kJ}\\\end{array}\\\text{The enthalpy of reaction is $\large \boxed{\textbf{-486 kJ}}$}.$

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3 years ago

HELP PLZZZZ ASAP im so desperate to get this done my course is due in 2 days and im sick so if you can help plz plz plz do if i

Gemiola [76]

It can be done by you only

First observe the figure or model .
Then note the observations about its molecular structures .
Then write it uses and why it is commercial most usable.

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3 years ago

What are isoelctronic species​

What are isoelctronic species