Question

water’s unique properties make life on earth possible. which statement best explains how these properties arise and why they are essential for life?
water’s properties result from its ability to form metallic bonds, enabling heat conduction and nutrient transport in organisms.
water’s properties result from ionic bonds, allowing it to dissolve only nonpolar molecules and maintain cell membranes.
water’s properties result from covalent bonds, causing it to repel other molecules and prevent chemical reactions in cells.
water’s properties result from hydrogen bonding, which gives it cohesion for transport in plants, high specific heat for temperature regulation, expansion upon freezing to protect aquatic life, and solvent ability for biochemical reactions

Explanation:

1. Analyze the first option: Water does not form metallic bonds (metallic bonds are in metals), so this is incorrect.
2. Analyze the second option: Water has polar covalent bonds, not ionic bonds, and it dissolves polar molecules, not nonpolar, so this is incorrect.
3. Analyze the third option: Water's covalent bonds (polar) lead to hydrogen bonding, and water is a good solvent and participates in reactions, not repel and prevent reactions, so this is incorrect.
4. Analyze the fourth option: Water's unique properties (cohesion, high specific heat, expansion on freezing, solvent ability) arise from hydrogen bonding between its molecules. Cohesion helps in water transport in plants, high specific heat regulates temperature, expansion on freezing insulates water bodies, and solvent ability is vital for biochemical reactions. This matches the correct scientific explanation.

Answer:

The fourth option (Water’s properties result from hydrogen bonding, which gives it cohesion for transport in plants, high specific heat for temperature regulation, expansion upon freezing to protect aquatic life, and solvent ability for biochemical reactions)