lesson 1.3: properties of water. Flashcards
water is inorganic and covalently bonded, but polar. why is that?
because oxygen has a slight negative charge in the bond and hydrogen has a slight positive bond. making the molecule polar.
when do hydrogen bonds occur?
whenever a partially positive H is attracted to a partially negative atom. like oxygen and nitrogen.
what are examples of adaptations some organisms have for maintaining water levels?
human skin, plant stomata, bacterial cysts
what does water do in our body?
carries away dissolved wastes from our cells and wastes excreted in liquid. via sweating and our bladder/urine
what things are protected/lubricated by a watery fluid?
our joints and brain
what do hydrogen bonds do to water?
give it a low freezing point and a high boiling point, so that it stays a liquid in our body
why do oceans remain an almost constant temperature?
because it absorbs a lot of heat before it warms up, and gives off a bunch of heat before it freezes
water is called the “universal solvent”, why?
because it dissolves other polar molecules.
due to the cohesiveness of the hydrogen bonds, water molecules are attracted to each-other. what forms on the surface of water because of this?
a film forms on top, giving water a surface tension that is stronger than most. some substances may reduce the cohesiveness of water and reduce the strength of the film on top of the water.
