Answer:
Explanation:
Single displacement reactions or single replacement reactions are reactions in which one substance is replacing another. The replacement of a metallic ion in solution by a metal atom higher in the activity series than the metal in solution is one of such reaction. The positions of the elements on the activity series provides the driving force for the reaction to occur:
A + BC → AC + B
Ca + Cl2 ->CaCl2 <span>synthesis (check your chemistry lesson)</span>
Answer: -7.4 kJ
Explanation:
The balanced chemical reaction is:
The expression for enthalpy change is,
where,
n = number of moles
and (as heat of formation of substances in their standard state is zero
Now put all the given values in this expression, we get
Therefore, the enthalpy change for this reaction is -7.4 kJ
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the baryonic mass of the universe.