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yKpoI14uk [10]
4 years ago
10

Question 22 Write the empirical formula for at least four ionic compounds that could be formed from the following ions:

Chemistry
1 answer:
Ivenika [448]4 years ago
7 0

Answer:

We can use the criss-cross method to work out the formulas.  

Explanation:

The steps are

  1. Write the symbols of the anion and cation.
  2. Criss-cross the numbers of the charges to become the subscripts of the other ion.
  3. Write the formula with the new subscripts.
  4. Divide the subscripts by their highest common factor.
  5. Omit all subscripts that are 1.

When we use this method, the formula for the compound formed from NH₄⁺ and PO₄³⁻ becomes (NH₄)₃PO₄.

The table below lists the formulas for the possible combinations.

\begin{array}{ccc}& \textbf{PO}_{4}^{3-} & \textbf{ClO}_{3}^{-}\\\textbf{NH}_{4}^{+} & \text{(NH$_{4}$)$_{3}$PO$_{4}$} & \text{NH$_{4}$ClO}_{3}\\\textbf{Fe}^{3+} & \text{FePO}_{4} & \text{Fe(ClO$_{3}$)}_{3}\\\end{array}

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This is conformity with Newton's law of universal gravitation.

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This law implies that the more the mass of two bodies, the more the gravitational force of attraction. And that the shorter the square of the distance between them, the more the attraction.

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Answer:

The given blank can be filled with direct.

Explanation:

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19. Which of the following chemical equations represents
Lesechka [4]

Answer:

  • C₃H₈ (g) + 5O₂(g) → 3CO₂ (g) + 4H₂O (l)

(option D. with the proviso that the subscripts of propane's chemical formula must be corrected)

Explanation:

<em>Propane</em> is the saturated hydrocarbon, alkane, with chemical formula C₃H₈ or CH₃CH₂CH₃.

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The chemical equation that represents this combustion is:

  • C₃H₈ (g) + O₂(g) → CO₂ (g) + H₂O (l) (skeleton equation: unbalanced)

Once you balance it, you get:

  • C₃H₈ (g) + 5O₂(g) → 3CO₂ (g) + 4H₂O (l)

        Left side           Right side

C         3                          3

H         8                          4×2 = 8

O        5×2 = 10               3×2 + 4 = 10

That equation corresponds to the option D. of the list, with the proviso that the subscripts of propane's chemical formula must be corrected

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