2.1.1 - Water

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Functions of water:

  • A reactant in many important chemical reactions- like photosynthesis and hydrolysis
  • A solvent which means that substances can dissolve in it
  • Transports substances, because it is a solvent. Substances such as water and glucose
  • Helps with temperature control. Carries heat energy away when it evaporates, which helps to cool

Structure of water molecules 

  • Shared negative hydrogen electrons are pulled towards oxygen, the other side of each hydrogen atom is left with a slight positive charge
  • Unshared negative electrons on the oxygen atom give it a slight negative charge. 
  • Makes water a polar molecule 
  • Negatively charged atoms of water attract the positively charged hydrogen atoms or other water molecules. This is


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