Answer:
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Stays the same in a closed system
NaN₃ is the chemical formula for Sodium Azide
Answer: chemical bond
Explanation:
The chemical bond simply refers to the electrostatic attraction that can be found between ions that are oppositely-charged. It should be noted that the chemical bond occurs due to the transfer of electrons that is being found between atoms.
Therefore, based on the question given, the electrostatic attraction that is seen between a positively charged nuclei and the negatively charged electrons which hence allows two atoms to be held together is the chemical bond.
Answer:
Explanation:
The question must be restated because you can calculate ΔH₂ from the other reactions only if you know the global ΔH, ΔH₁, and ΔH₃.
As stated by Hess’s law, the overall change in the enthalpy, ΔH, of a reaction does not depend of the path followed. Thus, when you have a series of reactions, the net change from the first reaction to the last reaction is equal to the sum of the ΔH values for the individdual reactions:
If you name ΔH₄, the overal change in the enthalpy to convert 1 to 4, but ΔH₁, ΔH₂, and ΔH₃ are the changes of the intermediate reactions that transform 1 in 2, 2 in 3, and 3 in 4, respectively, then, you can write, accordingly to Hess's law, you can write:
Then, assuming you know ΔH₄, ΔH₁, and ΔH₃, you can calculate ΔH₂ clearing from the previous equation:
- ΔH₂ = ΔH₄ - (ΔH₁ + ΔH₃) ← answer