Answer:
The missing reactant is 
55/25Mn
Explanation:
asumming the missing reagent is A/Z X
In nuclear reaction , the sum of atomic number and mass number of on both sides musst be equal
Thus ,
Z + 54 = 79 + 0
Z = 25
The element with atomic number 25 is Mn
A + 143 = 197 +1
A = 55
Therefore, the missing reagent is 55/25Mn
False because the atoms are what helps the liquid in the container
You should probably ask your teacher the next day, there may be a mistake.
Answer:
Product D contains 30 J
Explanation:
We know energy does not destroy or create, it only transforms. So, at the right side of the equation we have the energy of the reactant A and the energy of the reactant B, as a sum, and, as a result we have to get the same energy plus the energy absorbed by the reaction.
So, we have,
Ea+Eb = Eabsorbed+Ec+Ed
Ed = Ea+Eb-Eabsorbed-Ec
Ed = 85.1 J + 87.9 J - 104.3 J - 38.7 J
Ed = 30 J
