water

• why is water a polar molecule?

  water has regions of negative charge and regions of positive charge, oxygen is is relatively negative and hydrogen positive.
• how many hydrohen atoms does water contain?

  2
• why do polar molecules interact with eachother?

  the positive and negative regions of each molecule attract each other and form hydrogen bonds.
• how does water flow?

  hydrogen bonds are relatively weak, and constantly break and reform which causes water to move and flow
• Suggest which properties of water make it a key component of the blood?

  Water is a liquid so a good transport medium. As water is a polar molecule, it acts a solvent for charged molecules like ions or polar molecules such as glucose or enzymes, which are carried in the blood. As well as this, water is a coolant, so is relatively resistant to temperature change.
• Water forms the basis of stroma in the chloroplasts and the matrix in the mitochondria. Describe which properties of water make it such an important component of these particular organelles.?

  Water is a liquid so allows for the movement of substrates and enzyme, to come into contact with eachother and react (for enzyme substrate complexes). Water is a polar solvent so is able to carry products from reactions that are polar or ionic. As well as this, water is a substrate for some reactions, so is necessary for these reactions to take place.