The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. Using the model, evaluate each of the claims and
select ALL that are correct.
A)
Bacteria is essential to making nitrogen usable.
B)
Denitrification returns nitrogen to the atmosphere.
09
N2 is the form of nitrogen most used by plants,
D)
Fertilizers containing nitrogen are carried in runoff to lakes and rivers.
Eliminate
19
E)
Nitrogen fixation from lightning returns nitrogen to the atmosphere from
the soil
no

elements

explanation:

yes the other ones are right just show me a pic of ur face cuz u look hot

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol