3 years ago

In an atom, electrons

Chemistry

1 answer:

ICE Princess25 [194]3 years ago

5 0

Electrons are arranged in the obitals

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Determine the percentage of carbon and hydrogen in ethane C2H6 if the molecular weight is 30.

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Answer:

Percentage of carbon:

${ \tt{ = \frac{24}{30} \times 100\%}} \\ = 80\%$

Percentage of hydrogen:

${ \tt{ = \frac{6}{30} \times 100\%} } \\ = 20\%$

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3 years ago

During ______ the composition of a substance does not change

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During the Physical changes

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For each row in the table below, decide whether the pair of elements will form a molecular or ionic compound. If they will, then

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Answer:

$\begin{array}{cccll}\textbf{Element 1} & \textbf{ Element 2} &\textbf{Compound?} &\textbf{Formula} &\textbf{Type}\\\text{Ar}&\text{Xe} &\text{No} &\text{None}&\text{Neither}\\\text{F}& \text{Cs} &\text{Yes} &\text{CsF} &\text{Ionic}\\\text{N} &\text{Br} &\text{Yes} & \text{NBr}_{3}&\text{molecular} \\\end{array}$

Explanation:

You look at the type of atom and their electronegativity difference.

If ΔEN <1.6, covalent; if ΔEN >1.6, ionic

Ar/Xe: Noble gases; no reaction

F/Cs: Non-metal + metal; ΔEN = |3.98 – 0.79| = 3.19; Ionic

N/Br: Two nonmetals; ΔEN = |3.04 - 2.98| = 0.

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3 years ago

I have these answered, but I'd like someone to check them for me? Plz and thanks :)

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1. The third option is the least soluble in water because it is the chain with the most number of hydrocarbons. Next is the second option while the first one is the most soluble.
2. Statements 1 and 2 are true. The third option is not true all the time because it depends on the structure of the compound.

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Picture a neutral P atom. This neutral atom will have

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It will have 5 valence electrons as its in group 5.

The atom will gain as its closer to the full configuration 8.

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3 years ago