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18 Cards in this Set
- Front
- Back
What makes water polar? |
Water has a positive and negative end, separated by a distance. Each molecule has two slightly positive hydrogens, and a slightly negative oxygen. |
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What types of substances can water dissolve? |
Polar molecules, ions and ionic compounds. (E.g. glucose as a Pilar molecule, and sodium chloride as an ionic compound) |
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His does water acting as a transport medium assist plants? |
Water transports minerals in the xylem, and sucrose and amino acids in the phloem. |
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Water cannot dissolve what type if molecule? |
Non polar, such as lipids. |
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In what biochemical reactions does water act as a metabolite? |
Condensation and hydrolysis e.g. maltose+water=glucose+glucose and glucose+fructose=sucrose+water. |
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What does water having a high specific heat capacity mean? |
That a lot of energy is needed to raise 1g of water by 1°C (specifically, 4.186J/g°C). |
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Why is the specific heal capacity of water high? |
Because water has hydrogen bonds, which restrict the movement of molecules. A lot of energy is needed to break these bonds, and thus increase the temperature. |
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What is is a useful feature of water having a high specific heat capacity, in aquatic habitats? |
That significant temperature fluctuations are prevented, which provides aquatic organisms with stability in their habitat. |
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Where is water having a high latent heat of vaporisation useful? |
In human temperature control, as when sweat evaporates, the body cools. |
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In plants, how are the cohesive properties of water useful? |
Water sticks together in columns, which means it can be pulled-up xylem vessels. |
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How is the surface tension of water useful? |
In a pond, this property means that insects (e.g. pond skaters) can shift across the top of a pond. |
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How come the surface tension of water is made possible? |
Due to its cohesive properties. |
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At what temperature is water most dense? |
4°C. |
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Name on if the few substances which is more dense than water, as a liquid. |
Mercury. |
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How is water's high density useful for aquatic life? |
Is supports aquatic organisms. |
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How come ice is less dense than liquid water? |
Water molecules in ice bond in a tetrahedral arrangement, due to hydrogen bonds. This created spaces between molecules, giving ice a low density. |
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How is the low density of ice useful? |
It can provide insulation to aquatic life, if a sheet of ice forms on a pond. |
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How is the transparency of water useful? |
It enables plants underwater to photosynthesise. |