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. Steel - alloy; CO₂ - molecular; Graphite - network covalent; CaCO₃ - ionic; Bronze - alloy
• B. Steel - metallic; CO₂ - molecular; Graphite - network covalent; CaCO₃ - ionic; Bronze - alloy
• C. Steel - alloy; CO₂ - network covalent; Graphite -network covalent; CaCO₃ - ionic; Bronze - metallic
• D. Steel - metallic; CO₂ - network covalent; Graphite - amorphous; CaCO₃ - network covalent; Bronze - alloy

Answer: (A)

Verified step by step guidance

1. Identify the type of bonding and structure in steel. Steel is a mixture of iron and carbon, and sometimes other elements. It is classified as an alloy because it is a combination of metals.
2. Examine the structure of CO2. Carbon dioxide is composed of discrete molecules held together by covalent bonds. It is classified as a molecular solid.
3. Consider the structure of graphite. Graphite consists of layers of carbon atoms bonded covalently in a network. It is classified as a network covalent solid due to its extensive covalent bonding.
4. Analyze the composition of CaCO3. Calcium carbonate is composed of calcium ions and carbonate ions held together by ionic bonds. It is classified as an ionic solid.
5. Determine the classification of bronze. Bronze is an alloy made primarily of copper and tin. It is classified as an alloy because it is a mixture of metals.