B. Suppose that the chemist does not find that the pH of the pond has changed significantly since the time when large numbers of the fish were found in the pond.
After further research, the biologist discovers that the same fish species has been
dying in large numbers in other bodies of water because of an infestation of a
microscopic, parasitic protist. What type of expert should the biologist seek, and
why? (1 point)
Think about the subspecialties of biology that are part of environmental science.
CLOSE

the answer to this question is 3.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

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