Analyzing the Intermediate Reactions

Reaction(s) released heat.
Reaction released the most heat per mole of reactant.
If you negate Reaction 2 and combine the reactions, which substances do not cancel? Check all that apply.

H2
HCl
H2O
Mg
MgO
MgCl
O2

  for edge users    i hope this helps yall   :)

Lab: Enthalpy

Reflect on the lab

Analyzing the intermediate reactions

Explanation:

Reaction(s)  released heat.

Reaction  released the most heat per mole of reactant.

If you negate Reaction 2 and combine the reactions, which substances do not cancel? Check all that apply.

H2

HCl

H2O

Mg

MgO

MgCl

O2

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.