2.2 IB Water

Front

What is the polarity of water molecules?

Back

Water molecules are polar, with the oxygen end being slightly negative and the hydrogen end being slightly positive.

Front

What is capillary action?

Back

Capillary action is the ability of water to flow in narrow spaces without the assistance of external forces, often observed in plants.

Front

Define adhesion in the context of water.

Back

Adhesion is the attraction between water molecules and other substances.

Front

What is surface tension?

Back

Surface tension is the tightness across the surface of water that allows objects, like paper clips, to float.

Front

Why can water striders walk on water?

Back

Water striders can walk on water because they are light enough not to break the hydrogen bonds between water molecules.

Front

What is cohesion in relation to water?

Back

Cohesion is the attraction between water molecules, which allows them to stick together.

Front

Explain the significance of hydrogen bonds in water.

Back

Hydrogen bonds are weak attractions between water molecules that contribute to water's unique properties, such as high surface tension.

Front

What is the role of water in biological systems?

Back

Water is essential for life, serving as a solvent, a temperature regulator, and a medium for biochemical reactions.

Front

How does temperature affect the density of water?

Back

Water is most dense at 4°C; as it cools further or freezes, it becomes less dense, which is why ice floats.

Front

What is the difference between osmosis and diffusion?

Back

Osmosis is the movement of water across a semipermeable membrane, while diffusion is the movement of solutes from high to low concentration.