Topic 1.1: Water Questions

Which of these substances would dissolve LEAST well in water?

Inside a very narrow xylem vessel, water molecules cling to and climb the vessel walls. This is an example of which property of water?

Distinguish between a solvent and a solute, using water and salt as examples.

Sweat is about 99% water. Draw a diagram of one water molecule to show its structure.

A dog cools itself by panting, evaporating water from its tongue and airways. Which property of water makes this an effective way to lose heat?

Which process inside an organism depends directly on water acting as a solvent?

A hydrogen bond between two water molecules is an attraction between which two parts?

Outline what is meant by a hydrogen bond between two water molecules.

The first cells arose in the sea, and seawater is about 96% water. Draw the structure of a single water molecule.

Tree sap is mostly water. Draw a diagram showing the structure of one water molecule, including its bonds.

A pond skater rests on the surface of a still pond without breaking through. Which property of water is mainly responsible for supporting the insect?

The diagram shows two water molecules. In the diagram, the dashed line labelled X joins a hydrogen of the left molecule to the oxygen of the right molecule. What does the dashed line X represent? [Diagram: bio-hydrogen-bonding {"showCharges":true,"showThird":false}]

On a hot afternoon the air above a lake is much warmer than the lake water, even though both received the same sunlight. Which property of water best explains this?

State the type of bond that joins the oxygen atom to each hydrogen atom within a water molecule.

A whale lives in cold polar water, which draws heat away from its body very quickly. Which feature is an adaptation to the thermal property of water responsible for this rapid heat loss?

Distinguish between cohesion and adhesion in water.

A molecule is described as hydrophobic. What does this tell you about how it behaves in water?

A plant can only take up a mineral such as nitrate after it has dissolved in the soil water. Why must the nitrate dissolve first?

Iodine is a mineral that animals can obtain only from their diet. Cattle grazing on plants grown in iodine-poor soil develop an iodine deficiency. Which statement best explains this?

Which statement about a single water molecule is correct?