Properties of Water

What characteristic of water molecules allows them to form hydrogen bonds with each other?

• Their linear shape.

• The equal sharing of electrons between oxygen and hydrogen.

• The unequal sharing of electrons, creating slight positive and negative charges.

• Their ability to repel other water molecules.

How do water molecules move upwards against gravity in tall plants like trees?

• Through active transport mechanisms in the roots.

• By sticking to the xylem walls (adhesion) and to each other (cohesion).

• Due to the plant's ability to pump water using metabolic energy.

• Water molecules are naturally lighter than air, allowing them to float upwards.

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Why does ice float on water?

• Ice molecules are heavier than liquid water molecules.

• Water expands when it freezes, making ice less dense than liquid water.

• The hydrogen bonds in ice break down, allowing it to float.

• Ice contains trapped air bubbles, which make it buoyant.

What property of water helps stabilize temperatures in aquatic environments and within organisms?

• Its ability to dissolve many substances.

• Its high specific heat.

• Its capacity for evaporative cooling.

• Its ability to form surface tension.