Classify each solid as amorphous, molecular, network covalent, alloy or ionic.
a) Steel                                                    ______________________
b) CO₂                                                     ______________________
c) Graphite                                              ______________________
d) CaCO₃                                                 ______________________
e) Bronze, an alloy of Cu and Sn           ______________________

• A. alloy, molecular, network covalent, ionic, alloy
• B. alloy, molecular, molecular, ionic, ionic
• C. ionic, molecular, network covalent, ionic, alloy
• D. ionic, network covalent, molecular, alloy, ionic
• E. alloy, network covalent, molecular, alloy, ionic
• F. network covalent, molecular, molecular, alloy, ionic

Answer: (A)

Verified step by step guidance

1. Identify the type of solid for steel: Steel is a mixture of iron and carbon, which makes it an alloy. Alloys are mixtures of two or more elements, where at least one is a metal.
2. Classify CO2: Solid CO2, also known as dry ice, is composed of molecules held together by intermolecular forces, classifying it as a molecular solid.
3. Determine the type of solid for graphite: Graphite is composed of carbon atoms bonded in layers with strong covalent bonds within the layers, making it a network covalent solid.
4. Classify CaCO3: Calcium carbonate is composed of calcium ions and carbonate ions held together by ionic bonds, classifying it as an ionic solid.
5. Identify the type of solid for bronze: Bronze is an alloy made primarily of copper and tin, which classifies it as an alloy.