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Which is endothermic and which is exothermic.
Zn(s) + CuSO4(aq) → Cu(s) + ZnSO4(aq) + electrical energy
C(s) + S8(s) + heat → CS2(s)
When barium hydroxide-water(1/8) is mixed with ammonium thiocyanate, the container becomes cold to the touch.
Gasoline is burned in a generator.
Zn(s) + CuSO4(aq) → Cu(s) + ZnSO4(aq) + electrical energy
C(s) + S8(s) + heat → CS2(s)
When barium hydroxide-water(1/8) is mixed with ammonium thiocyanate, the container becomes cold to the touch.
Gasoline is burned in a generator.
Which of the following is a sign that a chemical change is taking place?
Select one:
A. an object breaking into pieces
B. a blue solid dissolving in water and changing the water to a blue color
C. a substance melting at high heat
D. an offensive odor emitting after too liquids are mixed
Select one:
A. an object breaking into pieces
B. a blue solid dissolving in water and changing the water to a blue color
C. a substance melting at high heat
D. an offensive odor emitting after too liquids are mixed
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