Question

which statement best explains why water can transport charged and polar molecules in blood?
waters ionic bonds are easily broken in blood, releasing free hydrogen at that bind directly to dissolved ions.
waters covalent bonds are easily broken in blood, releasing free oxygen ato that bind directly to dissolved ions.
oxygens low electronegativity makes water molecules nonpolar, enabling the to dissolve lipids efficiently in plasma.
oxygens high electronegativity creates partial charges in water, allowing water molecules to surround ions and polar solutes.

Explanation:

• Analyze Option 1: Water has covalent (not ionic) bonds between H and O, so this is incorrect.
• Analyze Option 2: Water's covalent bonds are not easily broken in blood to release free O atoms for binding to ions; this is wrong.
• Analyze Option 3: Oxygen has high electronegativity, making water polar (not nonpolar), and water doesn't dissolve lipids well (lipids are nonpolar, water is polar), so this is incorrect.
• Analyze Option 4: Oxygen is highly electronegative, creating a polar water molecule with partial charges. These partial charges allow water to surround (solvate) ions and polar solutes, explaining its ability to transport them in blood.

Answer:

The option "Oxygen's high electronegativity creates partial charges in water, allowing water molecules to surround ions and polar solutes." (the last option with the blue circle)