Biology Unit 1.1 Flashcards
electronegativity
tendancy of nucleus to attract bonding electrons, the more it attracts, the more electronegative
Poor covalent bond
Unequal sharing of electron pairs results in an unequal distribution of electrical charge and polarity.
Cohesion
The attraction of one molecule to another of the same type
What happens when water molecules are frozen?
They have less energy, causing hydrogen bonds to become stable and
What happens with water molecules as a liquid?
They move more, causing hydrogen bonds to form, break and reform
Transpiration Stream
Flow of water from roots to streams in a plant. Like sucking water up to a straw, water moves up because of staction force, going from a high area pressure to low
Adhesion
The attraction of one water molecule to of another type
Capillary action
When water ascends up a narrow tube due to adhesion, cohesion and surface tension
Surface Tension
Tension of the surface film of a liquid caused by cohesion in the surface layer which minimizes surface area
Solute
Substance being dissolved
Solvent
substance in which solute dissolves
Hydrophobic
Substance that does not dissolve in water
Hydrophilic
Substance that dissolves in water
Buoyancy
The ability of a liquid or gas to provide vertical upwards force for an object placed on it
Viscosity
The resistance to a flow of a fluid
