Solvent, transports substances, helps with temperature control and is a habitat
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Why is water polar?
The oxygen is better at attracting electrons so the oxygen is slightly negative and the hydrogen is slightly postive
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How are hydrogen bonds formed?
The slightly positive hydrogen on one molecule attracts the slightly negative oxygen on another molecule
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Water has a high or low specific heat capacity?
High
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Why does water have a high specific heat capacity?
The hydrogen bonds between water molecules can absorb a lot of energy, so it doesn't experience rapid temperature changes
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Water has a high or low latent heat of evaporation?
High
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Why does water have a high latent heat of evaporation?
It takes a lot of energy to break the hydrogen bonds between the water molecules
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Why is water very cohesive?
Because it's polar
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Why is cohesion useful?
it helps water to flow as all the molecules 'stick together', making it great for transporting substances (transpiration stream)
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Why is water a good solvent?
Because of its polarity.
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How does water dissolve substances?
Because water is polar, the slightly positive hydrogen is attracted to negative ions and the slightly negative oxygen is attracted to positive ions. This means ions get surrounded by water molecules.
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Is water more or less dense when it's solid?
Less dense
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Why is ice less dense than water?
water molecules are held further apart in ice than in water as each water molecule forms four hydrogen bonds making a lattice
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How is the fact that water is less dense as a solid useful to organisms?
Aquatic organisms can live in water below ice in lakes
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How is waters high specific heat capacity useful to organisms?
it makes it stable, maintains constant temperatures in cellular enviroments
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How is the fact that water is a good solvent useful to organisms?
helps transport dissolved compounds in and out of cells and acts as a medium for chemical reactions
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Other cards in this set
Card 2
Front
What are the 4 functions of water?
Back
Solvent, transports substances, helps with temperature control and is a habitat
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