Bond Energy

Front

Is this equation endo- or exo-thermic?

PCl₃ (s) + Cl₂ (g) --> PCl₅ (s) + energy

Back

exothermic

Front

Is this equation endo- or exo-thermic?

2KNO₃ (s) + energy --> 2KNO₂ (s) + O₂

Back

endothermic

Front

Is this reaction endo- or exo-thermic? NH₄NO₂ + energy --> N₂ (g) + 2H₂O (g)

Back

endothermic

Front

When new chemical bonds form, energy ____________.

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is released from the system.

Front

When the solids Ba(OH)₂ and NH₄SCN are mixed, a solution is produced and the temperature drops. Which statement about the energetics of this reaction is correct?

Back

The reaction is endothermic and ΔH is positive

Front

Which statement is correct for the reaction: 2Mg(s) + O₂(g) → 2MgO(s) ΔH = -1204 kJ? Options: 1204 kJ of energy are released for every mole of magnesium reacted, 602 kJ of energy are absorbed for every mole of magnesium oxide formed, 602 kJ of energy are released for every mole of oxygen reacted, 1204 kJ of energy are released for every two moles of magnesium oxide formed.

Back

1204 kJ of energy are released for every two moles of magnesium oxide formed

Front

Does breaking bonds require energy, release energy, or not involve energy at all?

Back

requires energy to break

Front

Based upon the graph above, what type of reaction is this?

Back

Endothermic

Front

In the graph above, what does D represent?

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enthalpy change

Front

Which of the following represents an exothermic reaction?

Back