1.2 Flashcards
what is the importance of water
-universal solvent = dissolves many substances
-cellular processes occur in water
-water is the simplest structure but has complex functions
why is ice 10% less dense than water
water molecules are spread out more
What is cohesion
the force of attraction between like molecules
molecules form hydrogen bonds with each other
why can small insects and spiders walk on water
due to the surface tension
What is adhesion
-the force of attraction between different molecules
-may form hydrogen bonds with other polar molecules
What helps plants move water
adhesion
what does heat capacity have to do with water
water can absorb large amounts of thermal energy
this helps organisms maintain a constant body temperature
What does heat vaporization have to do with water
water absorbs heat as it evaporates
organisms cools themselves through evaporation
how does solid water become less dense than liquid water
as water freezes it forms lattice structures which results in the molecules being further apart
how does lattice structures help organisms
ice floats form which prevent the ice from fully freezing which prevents organisms death
what has a high insulation value
ice
what are aqueous solutions
small water molecules surround other ions/molecules to prevent them from reforming
what is hydrophilic
polar substances that are attracted to water
what is hydrophobic
non-polar substance that are not attracted to water
what are properties of Acids
have H3O+ ions which are acidic
sour, conducts electricities, turns blue litmus paper red
