1.1- Structure of H20 + Hydrogen Bonding Flashcards
what determines properties of molecules
the subcomponents of the biological molecule
what is the ratio of H2O
1:2
what type of bond is H2O and define the bond
covalent bond (atoms share e-)
describe the effects of the bond on H2O
sharing is not = oxygen- more electronegative
what is polarity, example, what it allows molecules to do
difference in electronegativity (H2O- electrons pulled closer to O molecule)- polarity allows molecules to make H bonds w/oppositely charged molecules
what is a hydrogen bond
weak bond between negative and positive regions of 2 molecules (H2O forms H bond w/ water or other charged molecules)
what is cohesion, give example
2 same molecules in a hydrogen bond (water and water- negative oxygen bonds with positive hydrogen)
what is adhesion, give example
2 different molecules in a hydrogen bond (water and amino acid- positive hydrogen in water bonds with negative oxygen in amino acid)
what do living systems depend on
H2O properties
what does surface tension come from
hydrogen bonds between water molecules
what are emergent properties
the compound has different chemical and physical characteristics of single elements
what allows water to demonstrate chemical behaviors known as emergent properties
cohesion, adhesion, and surface tension
what is surface tension, example
result of increased hydrogen bonding forces between water molecules at surface, leaf floating on water- more sun for photosynthesis
what does waters high solvency in liquid state come from
H2Os adhesive properties (water not universal solvent only high solvency), ex: salt water- organisms absorb nutrients through water (makes up most of organism)
what does the cohesive property of water allow
hydrogen bonds to occur when water is in solid state, ice is less dense than liquid as a result (further apart but still bonded) ex: living things remain when only surface of lake freezes (doesn’t sink)
