Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
7 Cards in this Set
- Front
- Back
|
Describe water as a dipolar molecule. |
the hydrogen and oxygen atoms share electrons, and so the oxygen end is slightly negative and the hydrogen atoms are slightly positive. |
|
|
Why does water have a high specific heat capacity? |
hydrogen bonds=more energy to separate molecules. Certain amount of energy to heat a given amount of water. Organism buffer for sudden temperature changes. |
|
|
What is the latent heat of vaporisation of water? |
hydrogen bonding=a lot of energy to evaporate 1g of water sweat=effective means of cooling (body heat) |
|
|
What is the cohesion of water? |
the tendency of water molecules to stick together. Allows water to be pulled up a tube, such as in the xylem vessel of a plant |
|
|
What is the surface tension of water? |
where water molecules meet air, the molecules are pulled back into the body of water. This makes the surface strong enough to support small organisms. |
|
|
Why is water important to living organisms? |
Metabolism: break down complex molecules (hydrolysis)/chemical reactions take place/major raw material in photosynthesis. Solvent: Dissolves various materials (CO2, O2, urea, animo acids, ATP, enzymes) |
|
|
What are the other important features of water? |
Becomes sweat on the skin which evaporates. Not easily compressed (support) Transparent=aquatic plants can photosynthesize. |
