22 Use the diagram below to answer the following two questions. Chemical
Change
Physical
Change
I. Chewing and mixing of food with saliva
II. Movement of food through peristalsis
III. Reaction of food with hydrochloric acid
IV. Interaction of food with bile
Which of the digestive processes above will be found in the middle section of the Venn
diagram?
F I
H III
G II
) IV

answerleaving cheese out to get moldy;

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