Chemistry Chapter on Chemical Reactions

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Questions and Answers

What is the characteristic of an exothermic reaction?

It requires a catalyst.
It changes the chemical state of substances.
It absorbs heat.
It releases heat. (correct)

What does activation energy (Ea) represent in a chemical reaction?

The total energy of products.
The minimum energy needed to initiate a reaction. (correct)
The energy lost as heat.
The maximum energy of reactants.

Which term describes the unstable state during a chemical reaction?

Equilibrium
Transition State (correct)
Final State
Reactant State

What does an energy profile graph illustrate?

<p>The activation energy and energy changes during a reaction. (A)</p> Signup and view all the answers

What does equilibrium refer to in the context of chemical reactions?

<p>The condition where the rate of the forward and reverse reactions are equal. (D)</p> Signup and view all the answers

Flashcards

Exothermic Reaction

A chemical reaction that releases heat into the surroundings. Think of a fire, it releases heat and light.

Endothermic Reaction

A chemical reaction that absorbs heat from the surroundings. Think of a cold pack, it absorbs heat from your skin.

Activation Energy (Ea)

The minimum amount of energy required to start a chemical reaction. It's like pushing a rock uphill, you need a certain amount of effort to get it moving.

Transition State

The unstable state of a chemical reaction where the molecules are in a high-energy state. Think of it as a temporary state before the reaction is finished.

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Energy Profile

A graph showing the energy changes that occur during a chemical reaction. It includes the activation energy and the energy levels of reactants and products.

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