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Thermochemistry Quiz: Endothermic vs Exothermic

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Thermochemistry Quiz: Endothermic vs Exothermic

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Questions and Answers

What characterizes endothermic reactions in terms of heat energy?

They release heat energy.

They absorb heat energy. (correct)

They have no change in temperature.

They exhibit constant heat.

In which scenario is the enthalpy of the reactants greater than that of the products?

Nuclear fission

Exothermic reactions

Endothermic reactions (correct)

Combustion reactions

What is the enthalpy of reaction for exothermic reactions?

Positive

Negative (correct)

Undefined

Zero

Which of the following processes is an example of an endothermic reaction?

Photosynthesis (A) Signup and view all the answers

What occurs during the process of nuclear fission?

Heavy elements break down into lighter elements with energy release. (C) Signup and view all the answers

Which of the following statements about enthalpy is true?

The overall enthalpy change determines the type of reaction. (B) Signup and view all the answers

What type of reaction is combustion categorized as?

Exothermic, since it releases heat. (A) Signup and view all the answers

What occurs during an endothermic reaction?

Heat is absorbed from the surroundings. (C) Signup and view all the answers

Which of the following processes is an example of an exothermic reaction?

Burning wood in a campfire. (D) Signup and view all the answers

How does the enthalpy of reaction relate to chemical reactions?

It represents the difference between reactants' and products' enthalpy. (C) Signup and view all the answers

What is the primary cause of a glass of lemonade becoming colder when ice cubes melt?

Heat being absorbed by the melting ice. (D) Signup and view all the answers

Which statement correctly describes the breaking and forming of chemical bonds?

Breaking bonds absorbs heat, forming bonds releases heat. (C) Signup and view all the answers

What does the prefix 'endo' in endothermic signify?

Heat absorbed. (A) Signup and view all the answers

What role does enthalpy play in the context of a chemical reaction?

It quantifies the heat content associated with a reaction. (A) Signup and view all the answers

Why is it necessary to maintain heat during the conversion of liquid water to water vapor?

To supply energy needed for the phase change. (D) Signup and view all the answers