Extension: at this point you might want to consider how ionic and covalent bonding work, in order to really understand how the slight positive (δ+ ) and slight negative (δ- ) charges are generated. 2. Water has many properties which are essential for life. Complete the table below.
| Explanation | Significance to living things | Thermal Properties | When a solid changes to a liquid and a gas more heat is added. This is quite hard as to change phases you have to break the hydrogen bonds and it takes a lot of energy to change from one phase to another. | Water’s thermal properties means that it has the ability to cool us down. When sweat evaporates off our body it takes heat away from our body. | Cohesion | Water’s polar nature makes water “sticky”. This happens because the water molecules stick together due to the hydrogen bonds. | If water were not “sticky” water would not form droplets. In addition, cohesion allows plants to transpire and pull water up to the leaves. | Solvent Properties | Again due to water’s polar nature water is known as the “universal solvent” and as a result is it good at dissolving substances. Polar substances are hydrophilic and non-polar substances are hydrophobic. | Water’s solvent properties mean that it can transport waste through veins and arteries. It enables trees to transport gases and solutes as well. |
(include uses as a coolant, medium for metabolic reactions, transport medium)