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An ecosystem includes
all living and non living factors in enviorment
Organisam that use the energy of the sun to produce glucose are called
autotrophs
Heterotrophs
eat meat
herbivores
eat outotrophs
food chain example
wheat-->mouse-->cat
autotroph --> herbivores ---> heterotrophs
all organisams living in a given area are considered
community
Biotic
living part of enviorment
ie
plants bacteria animals
Nitrification
removing nitrogen gas from the atmosphere and incoporating it in living organisams
animals get nitrogen from
organisams they eat
when population attains carrying capacity, its avrage growth is
zero
to become an ion
need to either gain or lose electrons to have a full valance shell
seven diatomic molecules
I Have No BRight Or Cleaver Friends
Synthesis
two elements combine into two elements
flame placed next to gs makes "pop" sound
hydrogen
Metals
gain/lose
valance electrons to become
anions/cations
merals
gain
valance electrons to become
anions
Non -metal
gain/lose
valence electrns to become
cations/anions
non metals
lose
valance electrons to become
cations
trinitrogen hexafluoride
N3F6
iron (lll) bromide
FeBr3
lead (ll) nitrate
Pb(NO3)2
magnesium hydroxide
Mg(OH)2
H2CO3
carbonic acid
HNO2
nitrous acid
synthesis
___H2+___O2-->___
2H2O
neutralization
__Mg(OH)2+___H3PO4-->
3Mg(OH)2+2H3PO4--> Mg3(PO4)2+6H2O
double displacement
___NaOH+__Cu(NO3)2-->
2NaOH+Cu(NO3)2--> 2NaNO3+CuOH2
blue litmus paper -stays blue
base
red lithmus paper -turnes blue
base
Blue litmus paper - turnes red
acid
red litmus paper - stays red
acid
lewis dot diagram only show
element's valnce electrons
top-bottom-right-left
law of conservation of mass
mass stays the same as long as all gass,liquids are keepred
3 characteristics of acids
irrate skin
gives off H
2
taste sour
3 charactaristics of bases
Bitter
want harm skin
gives of OH
-
what happens during nutralization
strong base neutralizes strong acid
both have to be the same strength and quantity
creating salt
acid gives of
H
+
base gives off
OH
-
how does acid precipetion forms
gas ie NOx SO2 SO3
created when burning fossil fuels the gas combines with water molecules and then comes down as rain or snow
acid precipitation
desingrates paint on statues
ie china
how do scrubbers work
collect SO
2
before it leaves
smokestacks changes it into less harmfull gasses
ie CO2 washing it away with water
how does forest fires/ burrning disrupt CO2 cycle
When biomass is burned it releases excess CO
2
but since biomass is burned
there is no autotrops to change the CO
2
into 0
2
Pollution/foffil fuels disruption in CO
2 cycle
burnning foffil fuels relases excess CO
2
role in nitrogen cycle
N2 isn't usable therefore when lightning striks some makes N
2
combines with O
2
--> NO
3
role in nitrogen cycle
Bacteria
changes into
N
2
-->NO
3
NO
3
--> N
2
Role in nitrogen cycle of soil
stores NO3 until plants absorve it
role in nitrogen cycle of producer
obsorb NO3 throught their roots then eaten by herbivores transfering NO3 up the food chain
role of decomposers in nitrogen cycle
decompose organic mater NO3 --> goes into soil
density dependet
depending on number of species in population
density independet
occurs no matter the size of population
velocity
spped and direction of an object
speed
how fast an object moves
acceleration
speed becomes gradualy faster in a direction
8.9 m/s --> km/h
32.04km/h
what distance car travelling 65km/hr travel in 3.0 hrs
195km
what was the acceleration of a sprinter who finishes traveling 22m/s if she run for 12sec
1.8m/s
2
as car moves down a ramp the dots get further apart because
car getting faster
dots on the ramp are an example of
acceleration
dots on the flat part of the diagram represent
constant velocity
if force acting on an object is 155N what is the objects mass
15.8kg
Fgrav
9.8 N
if a car posses 50 000kg*m/s what would the car's momentum be if the velocity doubles and the mass tripled
300 000kg*m/s
what is the impulse on a vehicle if it crashes into a wall with force of 2100N over a period of 3.3 sec
6930
if a ball throwen into outerspace
the ball will go on forever unless something hits it
Author
sim11r
ID
143733
Card Set
April exam
Description
April science exam review part 1
Updated
3/25/2012, 9:55:48 PM
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