What is the primary difference between exothermic and endothermic reactions?

Chemical Reaction Concepts and Energy

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Chemistry
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9th - 10th Grade
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Hard

Patricia Brown
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Exothermic reactions absorb energy, while endothermic reactions release energy.
Exothermic reactions release energy, while endothermic reactions absorb energy.
Both exothermic and endothermic reactions absorb energy.
Both exothermic and endothermic reactions release energy.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is enthalpy best described in the context of chemical systems?
The total energy of a system, including kinetic energy.
The energy stored in chemical bonds within a system.
The energy released during a chemical reaction.
The energy required to start a chemical reaction.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is true about substances with low enthalpy?
They are always in a gaseous state.
They require more energy to react.
They are more stable than high enthalpy substances.
They are less stable than high enthalpy substances.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the temperature of the surroundings during an exothermic reaction?
The temperature fluctuates randomly.
The temperature increases.
The temperature remains constant.
The temperature decreases.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In an energy level diagram, what does a negative delta H indicate?
The reaction is endothermic.
The reaction is exothermic.
The reaction has no activation energy.
The reaction is at equilibrium.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is activation energy?
The energy required to maintain a reaction.
The energy released during a reaction.
The minimum energy needed to start a reaction.
The energy stored in the products of a reaction.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes the role of a spark in a lighter?
It absorbs energy from the surroundings.
It stabilizes the fuel molecules.
It releases energy from the fuel.
It provides the activation energy for combustion.
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