Exothermic and Endothermic Reactions
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Questions and Answers

What is a characteristic of an exothermic reaction?

  • It requires an external energy source
  • It always occurs spontaneously
  • It absorbs energy from the surroundings
  • It releases energy in the form of heat (correct)

Which type of reaction is an example of forming a chemical bond?

  • Endergonic reaction
  • Exothermic reaction (correct)
  • Spontaneous reaction
  • Endothermic reaction

What is the difference between an endergonic reaction and an endothermic reaction?

  • Endergonic reactions release energy, while endothermic reactions absorb energy
  • Endergonic reactions occur spontaneously, while endothermic reactions do not
  • Endergonic reactions require energy, while endothermic reactions requires energy in the form of heat (correct)
  • Endergonic reactions absorb energy, while endothermic reactions release energy

Why do exothermic reactions usually feel hot?

<p>They give off heat to the surroundings (D)</p> Signup and view all the answers

What is an example of an endergonic reaction?

<p>Photosynthesis (D)</p> Signup and view all the answers

What happens when the breaking breaking a chemical bond?

<p>Energy is absorbed (C)</p> Signup and view all the answers

Which of the following chemical reactions is an example of a combustion reaction?

<p>Hexanol and oxygen (D)</p> Signup and view all the answers

What type of reaction occurs when hydrogen bromide reacts with iron metal?

<p>Redox reaction (A)</p> Signup and view all the answers

What is the primary type of energy possessed by an object due to its motion or movement?

<p>Kinetic energy (D)</p> Signup and view all the answers

What happens to the thermal energy of a cup of hot tea when milk is added?

<p>It decreases (C)</p> Signup and view all the answers

What is the term for the energy that arises from the temperature of matter?

<p>Thermal energy (D)</p> Signup and view all the answers

What is the term for the energy of motion possessed by an object due to its velocity?

<p>Kinetic energy (A)</p> Signup and view all the answers

What is the primary indication that a chemical reaction has occurred?

<p>The production of new substances with different physical and chemical properties (B)</p> Signup and view all the answers

What type of reaction is characterized by the breaking and forming of chemical bonds?

<p>Chemical reaction (B)</p> Signup and view all the answers

What is the result of the rusting of a steel garbage can?

<p>The formation of iron oxide (Fe2O3) (D)</p> Signup and view all the answers

What is the difference between a chemical change and a physical change?

<p>A physical change involves a change in appearance, while a chemical change involves the breaking of chemical bonds (B)</p> Signup and view all the answers

What is an example of a chemical change?

<p>The rusting of a steel garbage can (A)</p> Signup and view all the answers

What is a characteristic of a chemical reaction?

<p>A change in the composition of molecules (A)</p> Signup and view all the answers

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