20 plus points. . which statements about this area are true based on what you know about petrified fossils? check all that apply. the area was once a forest. the area was uplifted. the area was buried in sediment. the area was probably covered by water. the area was covered by volcanic material.

That is incorrect, it's not all the the choices. The Answers are, A and D.

* The area was once a forest

* The area was probably covered by water

Explanation:

This is the answer for Earth science in Ed. I'm not sure if it's the correct answer on anything else but it should be. Hope this helped you out!

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