Which of the following is an anion? A. O2- B. Mg2+ C. Al3+ D. H

1 answer:

3 0

Anions are ions that have a negative charge. Its charge is what we call as valence electrons.
The charge on the ion is written as a superscript after the element symbol.
You can predict the negative charge on an ion by looking at the group number for the atom.
The charge for representative elements is typically equal to the group minus eight.
Therefore, the anion among the choices is letter A which is $O^{2-}$ .
Oxygen is in group 6A. The negative charge is 6 - 8 = 2. The symbol is $O^{2-}$ with the charge written as a superscript.

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Explanation:

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1. Nitrogen, oxygen, and fluorine atoms all seem pretty similar, at first. How many valence electrons does an atom of each have?

matrenka [14]

Nitrogen is 5 valence electrons
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2 years ago

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padilas [110]

Answer:

I believe that it is the 2nd option.

Explanation:

My reasonings are because C4H10O has 7 isomers. In which 4 are alcohol and the other 3 are ether.

The first option is ethers, specifically ethoxyethane.

The third option is ethers, specifically 1-methoxypropane.

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2 years ago

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lianna [129]

Answer:

The mantel. I'm pretty sure.

Explanation:

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In a 100 g sample of iron(III) oxide, how many grams of iron are present?

e-lub [12.9K]

The formula of Iron(III) oxide is Fe2O3
In order to calculate the mass of iron in a given sample of iron(III) oxide, we must first know the mass percentage of iron in iron(III) oxide. This is calculated by:
[mass of iron in one mole of iron(III) oxide/ mass of one mole of iron(III) oxide] * 100
= [(moles of iron * Mr of iron) / (moles of Iron * Mr of Iron + moles of Oxygen * Mr of Oxygen)] * 100
= [(2 * 56) / (2 * 56 + 3 * 16)] * 100
= (112 / 160) * 100
= 70%
Thus, in a 100g sample, the weight of iron will be:
100 * 70%
= 70 grams

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2 years ago