1.7 Water Flashcards
Is water polar
Yes
Which part of a water molecule has a higher affinity for electrons
the oxygen
Which atom in a water molecule is delta plus
the hydrogen
Which atom in a water molecule is delta negative
oxygen
What type of bond bonds the hydrogen to oxygen in a water molecule
a covalent bond
Is water a dipolar molecule
yes
What creates the cohesion in a water
the hydrogen bonds between the water molecules (NOT THE ATOMS)
Are hydrogen bonds weak or strong
Individually weak but together they are considerably strong
What is a hydrogen bond
An attraction between the slightly negative oxygen and slightly positive hydrogen
why is there surface tension in water
because the hydrogen bonds face down because hydrogen bonds can’t bond water with air.
What are the 8 properties of water
- Universal solvent
- High latent heat of evaporation
- High specific heat capacity
- Metabollite
- Ice less dense than water
- Cohesion
- Low viscosity
- Transparent
What property of water is creates this biological importance: Chemical reactions inside cells happen in aqueous solutions; water is also the main transport medium in organisms
Universal solvent
What property of water creates this biological importance: COOLANT: heat is lost from a surface when water evaporates from it, which acts as a cooling mechanism e.g. sweating
High latent heat of evaporation
What property of water creates this biological importance: TEMP STABILISER: cells can absorb/ lose a lot of heat energy, but only show a small temperature changes, organisms can live in extreme climates
High specific heat capacity
What property of water creates this biological importance: Water required in photosynthesis, in condensation reactions to synthesise biological polymers, and in digestion of polymers via hydrolysis
Metabollite
