Revision questions 2.2. Water -1- Understandings, Applications and Skills Understandings: • Water molecules are polar and hydrogen bonds form between them. • Hydrogen bonding and dipolarity explain the cohesive, adhesive, thermal and solvent properties of water. • Substances can be hydrophilic or hydrophobic. Applications and skills: • Application: Comparison of the thermal properties of water with those of methane. • Application: Use of water as a coolant in sweat. • Application: Modes of transport of glucose, amino acids, cholesterol, fats, oxygen and sodium chloride in blood in relation to their solubility in water Dr. Miltiadis Kitsos, DP Biology, Platon School, mailto:[email protected]; http://www.stepsinbiology.com
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Revision questions 2.2. Water -1-
Understandings, Applications and Skills
Understandings:• Water molecules are polar and hydrogen bonds form between them.• Hydrogen bonding and dipolarity explain the cohesive, adhesive, thermal and
solvent properties of water.• Substances can be hydrophilic or hydrophobic.
Applications and skills:• Application: Comparison of the thermal properties of water with those of
methane.• Application: Use of water as a coolant in sweat.• Application: Modes of transport of glucose, amino acids, cholesterol, fats, oxygen
and sodium chloride in blood in relation to their solubility in water
Dr. Miltiadis Kitsos, DP Biology, Platon School, mailto:[email protected]; http://www.stepsinbiology.com
Water molecules are polar and hydrogen bonds form between them.
1. Draw the configuration of a water molecule. Indicate:(a)the sharing of electrons among the oxygen and the hydrogen atoms. (b)the unequal sharing of the pair of electrons among the two different atoms. (c) the partial positive (+δ) and negative (-δ) charges.
2. Explain why the water molecule is a polar molecule.
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3. Draw 5 molecules of water and the hydrogen bonds/intermolecular forces between them.
Dr. Miltiadis Kitsos, DP Biology, Platon School, mailto:[email protected]; http://www.stepsinbiology.com
8. The image above demonstrates the movement of water molecule int the xylem vessels during transpiration. Outline which intermolecular forces contribute to this movement.
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9.Define:
(a) specific heat capacity
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(b) latent heat of evaporation
Dr. Miltiadis Kitsos, DP Biology, Platon School, mailto:[email protected]; http://www.stepsinbiology.com
17. Using information from the image below explain why amino acids are called zwitterions and how this affects their solubility in water. ……………………………………………………………………………………
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18. Outline which factors affect the solubility of oxygen in the blood plasma
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Dr. Miltiadis Kitsos, DP Biology, Platon School, mailto:[email protected]; http://www.stepsinbiology.com