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Chapter 2: Problem 89

Write the formula for each of the following compounds: a. sodium oxide b. sodium peroxide c. potassium cyanide d. copper(II) nitrate e. selenium tetrabromide f. iodous acid g. lead(IV) sulfide h. copper(I) chloride i. gallium arsenide j. cadmium selenide k. zinc sulfide l. nitrous acid m. diphosphorus pentoxide

Short Answer

Expert verified
a. Na₂O b. Na₂O₂ c. KCN d. Cu(NO₃)₂ e. SeBr₄ f. HIO g. PbS₂ h. CuCl i. GaAs j. CdSe k. ZnS l. HNO₂ m. P₂O₅

Step by step solution

01

a. Sodium oxide

The sodium oxide compound consists of a sodium ion, Na⁺, and an oxide ion, O²⁻. To balance the charges, the formula should have one sodium ion and one oxide ion. So the chemical formula for sodium oxide is Na₂O.
02

b. Sodium peroxide

Sodium peroxide, the compound is made up of a sodium ion, Na⁺, and a peroxide ion, O₂²⁻. To balance the charges, the formula should have two sodium ions and one peroxide ion. Thus, the chemical formula for sodium peroxide is Na₂O₂.
03

c. Potassium cyanide

Potassium cyanide is formed by the combination of a potassium ion, K⁺, and a cyanide ion, CN⁻. Here, both ions have equal and opposite charges. So the chemical formula for potassium cyanide is KCN.
04

d. Copper(II) nitrate

Copper(II) nitrate has a copper ion with a +2 charge (Cu²⁺) and a nitrate ion with a -1 charge (NO₃⁻). To balance the charges, we have one copper ion and two nitrate ions. Thus, the chemical formula for copper(II) nitrate is Cu(NO₃)₂.
05

e. Selenium tetrabromide

In selenium tetrabromide, Selenium has a -4 charge (Se⁴⁻) and bromine has a +1 charge (Br⁺). To balance the charges, there should be four bromine ions and one selenium ion. The chemical formula for selenium tetrabromide is SeBr₄.
06

f. Iodous acid

Iodous acid consists of an iodous ion (IO⁺) and a hydrogen ion (H⁺). As IO⁺ and H⁺ have equal and opposite charges, the chemical formula for iodous acid is HIO.
07

g. Lead(IV) sulfide

Lead(IV) sulfide is a compound formed by a lead ion with a +4 charge (Pb⁴⁺) and a sulfide ion with a -2 charge (S²⁻). To balance the charges, there should be two sulfide ions and one lead ion, resulting in the chemical formula PbS₂.
08

h. Copper(I) chloride

Copper(I) chloride is composed of a copper ion with a +1 charge (Cu⁺) and a chloride ion with a -1 charge (Cl⁻). Since both ions have equal and opposite charges, the chemical formula for copper(I) chloride is CuCl.
09

i. Gallium arsenide

Gallium arsenide is the compound formed between gallium (Ga³⁺) and arsenide (As³⁻). Their charges balance each other so the chemical formula for gallium arsenide is GaAs.
10

j. Cadmium selenide

Cadmium selenide consists of a cadmium ion (Cd²⁺) and a selenide ion (Se²⁻). Both ions have equal and opposite charges, leading to a chemical formula of CdSe.
11

k. Zinc sulfide

Zinc sulfide is the compound formed by zinc ion (Zn²⁺) and a sulfide ion (S²⁻). Since their charges are equal and opposite, the chemical formula for zinc sulfide is ZnS.
12

l. Nitrous acid

Nitrous acid is a compound that includes a hydrogen ion (H⁺) and a nitrite ion (NO₂⁻). Since the charges balance each other, the chemical formula for nitrous acid is HNO₂.
13

m. Diphosphorus pentoxide

Diphosphorus pentoxide consists of two phosphorus ions (P) and five oxide ions (O²⁻). As both ions have neutral charges, the chemical formula for diphosphorus pentoxide is P₂O₅.

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