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BioKnowledgy DP 2.2 Water - bottom line

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BioKnowledgy DP 2.2 Water - bottom line

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BioKnowledgy DP 2.2 Water - bottom line

  1. 1. 2 Molecular biology – 2.2 Water Name: http://www.bioknowledgy.info/ (Chris Paine) 2.2 Water - the bottom line The learning Statements The can you statements tell you what you notes should enable you to do. They are guidance to a minimum expectation. The deeper your understanding the easier you will find it to respond to questions and communicate your understanding. 2.2.U1 Water molecules are polar and hydrogen bonds form between them. Can you distinguish between covalent, ionic and hydrogen bonds? Can you draw and label a diagram of the atomic structure of a water molecule, including the polarity of the molecule and the position of the electrons in the outer shell? Can you, with reference to the diagram, explain why water is a polar molecule? Can you show the formation of hydrogen bonds between water molecules in a annotated diagram? 2.2.U2 Hydrogen bonding and dipolarity explain the cohesive, adhesive, thermal and solvent properties of water. Can you distinguish between adhesion with cohesion? Can you outline an example of how cohesion benefits an organism? Can you outline an example of how adhesion benefits an organism? Can you explain why water is a very good solvent? Can you outline examples of how the solvent properties of water benefits organisms? Can you state the three thermal properties of water that are useful to organisms and explain, using an example, their usefulness to organisms? 2.2.A2 Use of water as a coolant in sweat. Can you give a reason why it is important for mammals to control their body temperature? Can you explain how sweating is used as a mechanism to cool the body? Nature of science: Use theories to explain natural phenomena - the theory that hydrogen bonds form between water molecules explains the properties of water. (2.2) Can you explain how the observable properties of water provide evidence to support, and therefore are in turn explained by, the theory of hydrogen bonding? 2.2.U3 Substances can be hydrophilic or hydrophobic. Can you state that polar and ionic molecules are hydrophilic and non-polar, non-ionic molecules are hydrophobic? Can you outline the link between hydrophilic molecules and the solvent and adhesive properties of water? Can give examples of hydrophobic molecules and a solvent they can dissolve into? 2.2.A3 Modes of transport of glucose, amino acids, cholesterol, fats. oxygen, and sodium in blood in relations to their solubility in water. Can you identify glucose, amino acids, cholesterol, fats, oxygen, and sodium chloride. molecules as either being hydrophobic or hydrophilic? Can you outline the mechanism of transport in the blood of glucose, amino acids, cholesterol, fats, oxygen, and sodium chloride? 2.2.A1 Comparison of the thermal properties of water with those of methane. Can you compare and contrast the physical properties of methane and water (apart from molecular mass and formula values you need not recall the values)? Can you explain why the physical water and methane are different given their similar molecular mass?
  2. 2. http://www.bioknowledgy.info/ (Chris Paine) Recommended resources http://www.bioknowledgy.info/22-water.html Allott, Andrew. Biology: Course Companion. S.l.: Oxford UP, 2014. Print.

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