Essay About Reactant Energy And Product Energy

Alcohol
Join now to read essay Alcohol
This reaction is exothermic, as heat is given out. This is because the
amount reactant energy is more than the product energy the difference
between this is ?H, therefore some energy has been given out in the
form of heat.The energy is given out when forming the bonds between
the new water and carbon dioxide molecules. This can be shown in an
energy level diagram: Reaction co-ordinate ?H is the heat content,
which is the enthalpy, which is negative in exothermic reactions as
the diagram shows that energy is lost as heat. Enthalpy is defined
as the energy of reaction, or the heat energy associated with a
chemical change. Chemical Principles By Master & Slowinski says that
“For any reaction carried out directly at a constant pressure, the
heat flow is exactly equal to the difference between enthalpy of
products and that of the reactants”, or: Qp = Hp – Hr = ?H Where Qp is
the heat flow at constant pressure, Hp is heat energy of products, and
Hr is the heat energy of the reactants.
To measure ?H given off, we must use this energy to heat something,
this will be water. This is assuming that all the heat produced by
combustion of fuel (?H) will equal the amount of heat absorbed by the
water (q). So I will measure the amount of energy required to do so.
This can be worked out by useing the formula: q = mass X specific heat
capacity X temperature rise 1000 Where q is