A1.1 Flashcards
water is required for
effective interacion of growing/ copying molecules in life
formation of compartments which have internal chemistry (diffrent from enviroment)
cell membranes only function in a
watery enviro
metabolism
enzyme catalysed chemicsl reactions turning food to energy
metabolism can only occure in a
watery inviroment
o2 is more
electromagnetic than h so attracts the shared electron more
more shells
decrease pull on electrons since further away from protons and electrons will shiled them from nucleus
intermoleular forces called
H bond, holds molecules together,
H bond
drawn
resitss increase of
but is week so shown in dotted line
due to h bond wster resists increase on sa from gravity/ objects
angle for molecular drawings
104.5º
Cohesion
Water is attracted to water,
Adhesion
Water is attracted to other substances
all things are just tryi ng to
survive e reproduce
bipolar
one positive and one negaive regions
polar molecule
one or more regions are partially charged
process which rely on water
metabolism, circulation
photosynthesis
osmosis
electronegativity
how stronglyn nucleus attracts the electrons it shares with another atom
water advantages
transparent
less ºc change
protection from uv radiation
food flows past
less impact from gravity
in water, electrons pulled
closer to o2 cause more protons which attract it, makes it a universal solvent
in water sturggles
high pressure
dark
cold
h bonds makes water molecules
sticky cause of cohesion
capillary action
water cohesion/ adhesion and pulls through narrown tubes. in sand and soil and xylem
meniscus
cause molecules are attracted to the container
in plants, capillary action draws
more water out and prwvents cells from dryign out
hydrophilic
attraction to water, generally polar molecules, can dissolve, (tea, sugar, amylase) sodium mino acids
hydrophobic
oil fat (like cell mebranes)
non polar
aquaporins
transmembrane protens
plasme (water bases) in blood uses water as
water as solvent and can transport gliucoes and minerals
blood transports
nutrients hormones and waste
we use haemoglobins since
they can transport more o2 and cause it is non polar so wont dissolve
water properties which influence things
buoyancy
viscosity
thermal conductivity (higher than air)
specific heat capacity (water is more than air sicne we gotta break H bonds, even tho h bonds are weak)
when earth was formed
4 or 5 billion yeard agao it was too hot fo4 liqui watwer and we think water came from comets
the habitable/ goldylocks zone
orbital distance from star which will result in iquid water
capilary action if paper is +
the - will atteact and vise versa
H BONDS
give high surface tension, allow droplets and ponk skimmers
and high boiling e melting poings
forms not dense lettice
stabliize double helix struccture
if a scientist was thinking if a planet could have life they would consider
hot temperatuees for chemical reactions (from a star)
sovlent
liquid water
