Which of the following correctly identifies they type of bonding that occurs within each of the following substancesi. KBrii. NH3iii. Feiv. SiO2

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BlackTom AI · Accepted Answer

To tackle the question, we first identify the bonding types for each substance listed. For i. KBrii (likely KBr), the bond is ionic because a metal (K) transfers electrons to a nonmetal (Br), forming ions held together by electrostatic attraction. For ii. NH3, the bonds are covalent since nitrogen shares electrons with hydrogen to complete its octet, resulting in a molecular covalent compound. For iii. Fe, the bonding is metallic, characterized by a lattice of cations in a "sea" of delocalized electrons, which is typical of elemental metals. For iv. SiO2 (silicon dioxide), the bonding is covalent in a network (macromolecular) structure where each silicon is tetrahedrally bonded to oxygen, creating a strong, extended covalent framework.

Now evaluate each answer option:

Option a: 'i. ionic, ii. metallic, iii. covalent, iv. covalent' asserts that ii. NH3 is metallic bonding, which is incorrect because NH3 is a molecular compound with covalent bonds, not a metal lattice. It also assigns iii. Fe as covalent instead of metallic, which contradicts the well-established metallic bonding in iron. Overall, this option mislabels two substances.

Option b: 'i. ionic, ii. covalent, iii. metallic, iv. covalent' aligns with the correct identifications discussed above: i ionic for KBr, ii covalent for NH3, iii metallic for Fe, and iv covalent for SiO2 network. This option matches the standard chemistry classifications for these substances.

Option c: 'i. metallic, ii. covalent, iii. covalent, iv. ionic' incorrectly labels i. as metallic (it should be ionic), and iv. as ionic (SiO2 is covalent network), while also misclassifying iii. Fe as covalent rather than metallic. Multiple errors here.

Option d: 'i. covalent, ii ionic, iii. metallic, iv. covalent' wrongly assigns i. as covalent (KBr is not covalent) and ii. as ionic (NH3 is not ionic), which makes this option fundamentally incorrect for the first two substances, with the remaining parts also inconsistent.

In summary, the only option that consistently matches the correct bonding types for all four substances is option b, since it correctly describes i as ionic, ii as covalent, iii as metallic, and iv as covalent.

MCD1170 Introductory Chemistry - Trimester 1 - 2025

Which of the following correctly identifies they type of bonding that occurs within each of the following substancesi. KBrii. NH3iii. Feiv. SiO2

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