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water
biology- sep 2024
| Question | Answer |
|---|---|
| the atoms that make up water are | 1 oxygen 2 hydrogen |
| atoms that make up a water molecule are bonded | covelently |
| the chemical structure of water is written | h20 |
| the imbalance of electrons in the covalent bond of a water molcule results in | polarity |
| polarity is | difference in charge of a water molecule |
| which atom in a water molecule has higher electronegativity | oxygen |
| which atom in a water molecule has lower electronegativity | hydrogen |
| what does polarity allow | the hydrogen atoms to form associations with other polar molecules |
| what do positive poles attract | negative poles of other molecules |
| what is a hydrogen bond | intermolecular association formed as a result of polar covalent bonds in a water molecule |
| how are hydrogen bonds formed | a positive hydrogen atom is attracted to a negative atom of another molecule |
| what are the 3 examples of negatively charged atoms that form hydrogen bonds | oxygen, flourine, nitrogen |
| what properties of water is nitrogen responsible for | thermal conductivity, cohesion, solvent |
| how is water cohesive | water molecules can stick to one another in the formation of hydrogen bonds |
| what does hydrogen bonding allow (cohesion) | water can resist low levels of external force |
| what does cohesion create | surface tension |
| example of an organism that benefits from water cohesion | waterglider |
| how is water adhesive | a water molecule can stick to another polar molecule by forming polar associations |
| capillary action | attraction to polar molecules allows water to flow in opposition to gravitational forces |
| what is adhesion | the attraction between water and other substances via hydrogen bonds |
| what does hydrophobic mean | can't be dissolved in water |
| what does hydrophilic mean | can be dissolved in water |
| are hydrophobic atoms polar or non polar | non polar |
| are hydrophilic atoms polar or non polar | polar |
| example of a hydrophobic material | plasma membrane |
| example of hydrophilic material | glucose |
| 1 reason water is important for metabolism | it allows enzymes to maintain their shape to catalyse reactions |
| 1 reason water is important for transport | water-based substance like blood transport compounds like oxygen |
| example of a multicellular organism | human |
| properties of water list | buoyancy, thermal conductivity, viscosity, high specific heat capacity, high latent evapouration |
| what does high specific heat capacity mean | takes a lot of energy to heat water as hydrogen bonds absorb most of it |
| why does heat specific capacity make water a good habitat | water does not experience rapid tempreture changes |
| what is thermal conductivity | the ability to tranfer heat when there is a tempreture difference |
| what is viscosity | resistance of fluid to change shape |
Created by:
Georgie007
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