IB biology water quiz

Polarity

The electrons are atrracted to the element that has more electrons. For example in anwater molecule, electrons are attracted to Oxygen because it is more electronegative than hydrogen

Covalent bonds

Elements share electrons

Hydrogen bonds

Elements constantly break and make bonds

Cohesion

Allows water molecules to stick to each other as a result of hydrogen bonds

Adhesion

Allows water molecules to stick to other substances/surfaces

Surface tension

Measure of how difficult it is to break or stretch the surface of a liquid

Temperature stabilization

Water stabilizes air temperature by absorbing heat from air that is warmer and releasing the stored heat to air that is cooler.

Heat of vaporization

The change of liquid water to gas. The hydrogen bonds must be broken, it moderates global temperature and allows for water to have a high boiling point

Evaporative cooling

As liquid evaporates, the surface of the liquid that remains behind cools. This makes it harder to continue the evaporative process

Water expands as it freezes

Ice is less dense than water. It expands because of hydrogen bonding, it bonds molecules to keep at arms length

Solution

Liquid that is a mixture of two or more substances

Solvent

The dissolving agent

Solute

The substance that is dissolved

Aqueous solution

Water is the solvent. Ions and polar compounds can dissolve in water

Hydrophilic

Water loving; A substance that has an affinity for water

Hydrophobic

Water fearing; A substance that does not have an affinity for water

High specific heat

This allows substances (water) to break hydrogen bonds