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1 year ago

State the guideline you can use to predict the formula of:

Chemistry

1 answer:

Cerrena [4.2K]1 year ago

4 0

We can predict formula of ionic compounds by:

Take a look at where the elements are listed on the periodic table.
The amount of electrons that an element would need to gain or lose in order to resemble an atom of a nearby noble gas is one of the similarities that atoms in the same column as one another (group) tend to display.
Alkali metal group I ions have +1 charges.
Alkaline earth metals (group 2 ions) have a +2 charge.
Nonmetal group 6 ions have a charge of -2.
Halides in group 7 have a -1 charge.
The charges of the transition metals cannot be predicted in a straightforward manner.
Check out a table of charges (valences) to see potential values. The +1, +2, and +3 charges are most frequently employed in beginning and general chemistry courses.
Keep in mind that the positive ion is always stated first when writing an ionic compound's formula.

These are the few guidelines we can use to product formula.

Learn more about ionic compounds here:

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Solid aluminum and gaseous oxygen read in a combination reaction to produce aluminum oxide. 4Al(s) + 3O_2(g) rightarrow 2Al_2O_3

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Answer:

4.7 g. Option 5 is the right one.

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2.5 g Al / 26.98 g/mol → 0.092 moles of Al

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Then, 0.092 moles of O₂ would react with (0.092 . 3)/ 4 = 0.069 moles O₂

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Then, 0.092 moles of Al would produce (0.092 .2) / 4 = 0.046 moles

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3 years ago

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Complete question is;

When a diprotic acid is titrated with a strong base, and the Ka1 and Ka2 are significantly different, then the pH vs. volume plot of the titration will have

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c. no equivalence point.

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Option E - Two Distinct Equivalence points

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I've attached a sample diprotic acid titration curve.

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