Water 4.0 / 5 based on 2 ratings ? BiologyBiological molecules, organic chemistry and biochemistryASWJEC Created by: fionnluke1Created on: 29-11-15 20:53 What is a dipole? A polar molecule, with a positive and negative charge, separated by a very small distance. 1 of 15 What is a hydrogen bond? The weak attractive force between a hyrdogen atom with a partial positive charge and an atom with a partial negative charge, such as oxygen. 2 of 15 Are hydrogen bonds strong or weak? Hydrogen bonds are weak but lots of them makes molecules difficult to separate 3 of 15 How does the solvent property of water help living organisms? Living organisms obtain their key elements from aqueous solution 4 of 15 How does the high specific heat capacity property of water help aquatic organisms? Keeps aquatic habitats stable 5 of 15 What does 'high specific heat capacity' mean? Large amount of energy is needed to raise water temperature 6 of 15 Why does water have a high specific heat capacity? The hydrogen bonds restrict movement, they resist and increase in kinetic energy, thus resisting a temp. increase. 7 of 15 How does the high specific heat capacity property of water help enzymes? No large fluctuations in temperature of water in organisms so enzymes in cells can work efficiently. 8 of 15 What is meant by 'high latent heat vaporisation'? Lots of energy is needed to turn liquid into vapour 9 of 15 How does the high latent heat vaporisation property of water help humans? Heat is used to vaporise water from sweat on the skin to cool people down 10 of 15 What is meant by 'cohesion'? Water molecules attract each other and form hydrogen bonds; molecules stick together in a lattice 11 of 15 How does the property of cohesion help plants? Allows columns of water to be drawn up the xylem in plants 12 of 15 How does high surface tension help pond skaters? It allows them to skate across the surface of the pond. 13 of 15 How does the high density of water help aquatic organisms? It gives them support and buoyancy; it prevents large bodies of water losing heat and freezing completely 14 of 15 How does the property of transparency help aquatic plants? It allows light through to allow photosynthesis 15 of 15
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