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Hitman42 [59]
3 years ago
12

Why is peer review important when publishing experimental results? A. Peer review makes the experiment repeatable. B. Peer revie

w is necessary for the scientific method to be followed. C. Peer review keeps the data from being biased. D. Peer review makes the results more reliable.
Chemistry
2 answers:
MA_775_DIABLO [31]3 years ago
4 0
The answer is D. At least that's what I think.
cluponka [151]3 years ago
3 0

Answer:

D. Peer review makes the results more reliable.

Explanation:

Hello,

When one publishes experimental results, during the experimentations, several mistakes such as wrong data record, fluctuating-displayed measurements (specially by the balances), trembling while pipetting, wrong procedures and others could be done so the results will be affected. Thus, a peer is important because that person could help us to correct things we're doing wrongly or do them again to get a common agreement between the employed techniques and recordings.

Best regards.

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Is selenium tetrafluoride an ionic or covalent bond?
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Answer:

Synthesis

The first reported synthesis of selenium tetrafluoride was by Paul Lebeau in 1907, who treated selenium with fluorine:[1]

Se + 2 F2 → SeF4

A synthesis involving more easily handled reagents entails the fluorination of selenium dioxide with sulfur tetrafluoride:[2]

SF4 + SeO2 → SeF4 + SO2

An intermediate in this reaction is seleninyl fluoride (SeOF2).

Other methods of preparation include fluorinating elemental selenium with chlorine trifluoride:

3 Se + 4 ClF3 → 3 SeF4 + 2 Cl2

Structure and bonding

Selenium in SeF4 has an oxidation state of +4. Its shape in the gaseous phase is similar to that of SF4, having a see-saw shape. VSEPR theory predicts a pseudo-trigonal pyramidal disposition of the five electron pairs around the selenium atom. The axial Se-F bonds are 177 pm with an F-Se-F bond angle of 169.2°. The two other fluorine atoms are attached by shorter bonds (168 pm), with an F-Se-F bond angle of 100.6°. In solution at low concentrations this monomeric structure predominates, but at higher concentrations evidence suggests weak association between SeF4 molecules leading to a distorted octahedral coordination around the selenium atom. In the solid the selenium center also has a distorted octahedral environment.

Reactions

In HF, SeF4 behaves as a weak base, weaker than sulfur tetrafluoride, SF4 (Kb= 2 X 10−2):

SeF4 + HF → SeF3+ + HF2−; (Kb = 4 X 10−4)

Ionic adducts containing the SeF3+ cation are formed with SbF5, AsF5, NbF5, TaF5, and BF3.[3] With caesium fluoride, CsF, the SeF5− anion is formed, which has a square pyramidal structure similar to the isoelectronic chlorine pentafluoride, ClF5 and bromine pentafluoride, BrF5.[4] With 1,1,3,3,5,5-hexamethylpiperidinium fluoride or 1,2-dimethylpropyltrimethylammonium fluoride, the SeF62− anion is formed. This has a distorted octahedral shape which contrasts to the regular octahedral shape of the analogous SeCl62−. [5]

Explanation:

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Answer:

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Explanation:

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