Question

1. the table shows the properties of four solids. which substance could represent a covalent compound?

Explanation:

Step1: Analyze covalent compound properties

Covalent compounds generally have low melting points (weak intermolecular forces), do not conduct electricity in solid state (no free - moving charged particles), and are often insoluble in water (non - polar or weakly polar nature).

Step2: Check each substance

• Substance A: High melting point (unlikely for covalent compound).
• Substance B: Conducts electricity in solid state (covalent compounds don't, this is a property of metals).
• Substance C: High melting point (unlikely for covalent compound).
• Substance D: Low melting point, no conductivity in solid state, insoluble in water (matches covalent compound properties).

Answer:

D. Substance D