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12 - Energetics

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✅EvaluateQuestion 1 of 21

What is meant by an exothermic reaction?

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✅EvaluateQuestion 2 of 21

Which of the following is an example of an exothermic process?

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✅EvaluateQuestion 3 of 21

What is the sign of ΔH for an endothermic reaction?

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✅EvaluateQuestion 4 of 21

Which reaction absorbs energy from its surroundings?

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✅EvaluateQuestion 5 of 21

What happens when bonds are broken?

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✅EvaluateQuestion 6 of 21

Which of the following reactions is endothermic?

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✅EvaluateQuestion 7 of 21

In an energy level diagram for an exothermic reaction:

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✅EvaluateQuestion 8 of 21

Which of the following best describes activation energy?

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✅EvaluateQuestion 9 of 21

When a cold pack is activated, the temperature drops because:

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✅EvaluateQuestion 10 of 21

Which equation represents an exothermic process?

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✅EvaluateQuestion 11 of 21

The energy change of a reaction is calculated by:

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✅EvaluateQuestion 12 of 21

When ethanol burns in air, heat is released. This means:

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✅EvaluateQuestion 13 of 21

Which factor affects whether a reaction is exothermic or endothermic?

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✅EvaluateQuestion 14 of 21

Why are catalysts important in energy changes?

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✅EvaluateQuestion 15 of 21

Given bond energies: H–H = 436, O=O = 498, and O–H = 463, calculate ΔH for 2H₂ + O₂ → 2H₂O.

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✅EvaluateQuestion 16 of 21

Which of the following energy profiles shows a higher activation energy?

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✅EvaluateQuestion 17 of 21

Why does temperature increase during combustion?

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✅EvaluateQuestion 18 of 21

Which industrial process involves exothermic reactions?

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✅EvaluateQuestion 19 of 21

In an endothermic reaction, how does the energy of the products compare to that of the reactants?

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✅EvaluateQuestion 20 of 21

The ΔH for a certain reaction is +120 kJ/mol. What does this mean?

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✅EvaluateQuestion 21 of 21

Which of the following best explains why photosynthesis is endothermic?

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✅EvaluateQuestion 1 of 21

What is meant by an exothermic reaction?

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