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Summary Water A level Biology
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Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.
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Water summary notes02 December 2022 11:06
Property Explanation
Cohesion and Water molecules can attract each other and stick together to form a larger d
adhesion
Also has strong adhesion as the water molecules can stick to the capillary tu
Called capillary action- cohesion between water molecules and adhesion bet
inside of glass tube
Water is a Water is polar so can dissolve most polar solutes (ie salt) as the water molec
good solvent molecules of solute and attract them so that they dissolve
Oil is non polar so cannot dissolve polar solutes
High specific Water has a high specific heat capacity - so lots of energy is re quired to bre
heat capacity- means water takes longer to heat up
buffers
temperature Water buffers temperature changes
changes
High latent Water with hot water on newspaper cooled down faster as more high energ
heat capacity- evaporated leaving the cooler ones behind
provides
cooling effect
Water has a high latent heat of evaporation which means lots of energy is re
hydrogen bonds in order to make liquid water a gas and therefore lots of en
volume of water that evaporates as the water molecules with the highest kin
that evaporate, leaving the cooler water molecules behind - it provides a coo
High surface Water has a high surface tension as water molecules attract each other as hy
tension between nearby molecules which resist stretching or breaking
Additional
- Metabolite in metabolic reactions
- Ice is less dense than water- water molecules held slightly apart in an open lattice- free
top to bottom
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