When vinegar and baking soda are mixed, a new chemical called carbonic acid is made. This carbonic acid immediately decomposes into carbon dioxide gas. When you mix the vinegar and baking soda, it's the carbon dioxide gas that makes the bubbles.
Shivering, because it’s just a reflex to maintain homeostasis and nothing is necessarily ‘coming out’
It is a combustion reaction. C3H8 will react with oxygen to form carbon dioxide and water.
Answer:
Since heat is released for
C
3
H
8
(
g
)
+
5
O
2
(
g
)
→
3
CO
2
(
g
)
+
4
H
2
O
(
g
)
+
2219.9
kJ
,
we say that
Δ
H
∘
C
=
−
2219.9 kJ/mol propane
. We approximate that this is the change in potential energy for the reactants going to the products.
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The above is for an endothermic reaction.
A certain feature of combustion reactions suggests that you should draw the diagram DIFFERENTLY from what you see above. How should the energy of the products compare with that of the reactants for combustion reactions?