The standard enthalpy of reaction should be negative.
<h3>What is enthalpy?</h3>
A thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.
Inside the heat pack are two chemicals that get mixed when you smush them together. As they mix, some weak bonds are broken, which takes a little bit of energy. But new, stronger bonds form which release energy. Releasing that energy causes the surroundings to heat up.
Hence, option B is correct.
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Any of the elements occupying group 17 on the periodic table. They form highly acidic compounds with hydrogen.
The elements are:
Fluorine (F)
Chlorine (Cl)
Bromine (Br)
Iodine (I)
Astatine (At)
Answer:
b.a convex lens forms a smaller,real image.
Answer:
Na+, O, C, Na
(Na+ has more ionization energy and Na has less ionization energy)