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Chapter 7: Problem 68

Write balanced equations for the following reactions: (a) potassium oxide with water, (b) diphosphorus trioxide with water, (c) chromium(III) oxide with dilute hydrochloric acid, (d) selenium dioxide with aqueous potassium hydroxide.

Short Answer

Expert verified
(a) \(K_2O + H_2O \rightarrow 2KOH\) (b) \(P_4O_6 + 6H_2O \rightarrow 4H_3PO_3\) (c) \(Cr_2O_3 + 6HCl \rightarrow 2CrCl_3 + 3H_2O\) (d) \(SeO_2 + 2KOH \rightarrow K_2SeO_3 + H_2O\)

Step by step solution

01

1. Reaction of potassium oxide with water

Potassium oxide (K2O) reacts with water (H2O) forming potassium hydroxide (KOH). Unbalanced equation: K2O + H2O -> KOH Now, we will balance this equation. Balanced equation: K2O + H2O -> 2KOH
02

2. Reaction of diphosphorus trioxide with water

Diphosphorus trioxide (P4O6) reacts with water (H2O) to form phosphoric acid (H3PO3). Unbalanced equation: P4O6 + H2O -> H3PO3 Now, we will balance this equation. Balanced equation: P4O6 + 6H2O -> 4H3PO3
03

3. Reaction of chromium(III) oxide with dilute hydrochloric acid

Chromium(III) oxide (Cr2O3) reacts with dilute hydrochloric acid (HCl) to form chromium(III) chloride (CrCl3) and water (H2O). Unbalanced equation: Cr2O3 + HCl -> CrCl3 + H2O Now, we will balance this equation. Balanced equation: Cr2O3 + 6HCl -> 2CrCl3 + 3H2O
04

4. Reaction of selenium dioxide with aqueous potassium hydroxide

Selenium dioxide (SeO2) reacts with aqueous potassium hydroxide (KOH) to form potassium selenite (K2SeO3) and water (H2O). Unbalanced equation: SeO2 + KOH -> K2SeO3 + H2O Now, we will balance this equation. Balanced equation: SeO2 + 2KOH -> K2SeO3 + H2O

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Most popular questions from this chapter

Use orbital diagrams to illustrate what happens when an oxygen atom gains two electrons. Why is it extremely difficult to add a third electron to the atom?

Some ions do not have a corresponding neutral atom that has the same electron configuration. For each of the following ions identify the neutral atom that has the same number of electrons and determine if this atom has the same electron configuration. If such an atom does not exist explain why: (a) \(\mathrm{Cl}^{-}\) (b) \(\mathrm{Sc}^{3+}\) (c) \(\mathrm{Fe}^{2+}\), (d) \(\mathrm{Zn}^{2+}\), (e) \(\mathrm{Sn}^{4+}\).

(a) During the period from about 1800 to about 1865 , the atomic weights of many elements were accurately measured. Why was this important to Mendeleev's formulation of the periodic table? (b) What property of the atom did Moseley associate with the wavelength of X-rays emitted from an element in his experiments? (c) Why are chemical and physical properties of the elements more closely related to atomic number than they are to atomic weight?

Note from the following table that the increase in atomic radius in moving from \(Z r\) to \(H f\) is smaller than in moving from \(Y\) to La. Suggest an explanation for this effect. \begin{tabular}{llll} \hline \multicolumn{3}{l} { Atomic Radii \((\AA)\)} \\ \hline \(\mathrm{Sc}\) & \(1.44\) & \(\mathrm{Ti}\) & \(1.36\) \\ \(\mathrm{Y}\) & \(1.62\) & \(\mathrm{Zr}\) & \(1.48\) \\ \(\mathrm{La}\) & \(1.69\) & \(\mathrm{Hf}\) & \(1.50\) \\ \hline \end{tabular}

The first ionization energy of Ar and the electron affinity of \(\mathrm{Ar}\) are both positive values. What is the significance of the positive value in each case?
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