Chemical Reactions Overview
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Questions and Answers

What is a key difference between chemical changes and physical changes?

  • Chemical changes are temporary, while physical changes are permanent.
  • Physical changes affect the chemical composition, while chemical changes do not.
  • Physical changes produce a new substance, while chemical changes do not.
  • Chemical changes are reversible, while physical changes are irreversible. (correct)

    • Which of the following is NOT a key signal to recognize a chemical reaction?

  • Gas or bubbles produced
  • Reversibility of the change (correct)
  • Formation of a precipitate in the mixing of two liquids
  • A color change occurs

    • What is the primary outcome of a chemical reaction?

  • Causing a temporary effect
  • Creating a new substance (correct)
  • Only affecting physical properties
  • Producing a reversible change

    • In which environment can chemical reactions occur?

    <p>Any time, any place, under nearly any conditions</p> Signup and view all the answers

    What is the main product of a combustion reaction involving hydrocarbons burning in the presence of oxygen?

    <p>Carbon dioxide and water vapor</p> Signup and view all the answers

    What is the function of stomach acid in the process of digestion?

    <p>To break down food into nutrients</p> Signup and view all the answers

    What is the term for the process when a metal combines with oxygen and water in the atmosphere?

    <p>Oxidation</p> Signup and view all the answers

    Which chemical reaction is responsible for plants turning sunlight into energy?

    <p>Photosynthesis</p> Signup and view all the answers

    What type of reaction occurs in batteries due to the process of electrolysis?

    <p>Reduction-oxidation (Redox)</p> Signup and view all the answers

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

    <p>Chemical changes are reversible, while physical changes are permanent</p> Signup and view all the answers

    Which of the following is NOT a signal to recognize a chemical reaction?

    <p>Physical change is observed</p> Signup and view all the answers

    In which of the following types of reactions does a color change occur as a signal?

    <p>Synthesis reactions</p> Signup and view all the answers

    What does the formation of gas or bubbles indicate in a chemical reaction?

    <p>Release of energy</p> Signup and view all the answers

    Why is it important to be able to think beyond the stereotype that chemical reactions only occur in labs?

    <p>To appreciate the variety of conditions under which reactions can occur</p> Signup and view all the answers

    What is the primary purpose of combustion reactions?

    <p>To harness available energy from burning fuels</p> Signup and view all the answers

    Which of the following is an example of oxidation?

    <p>Tarnishing of metal through reaction with oxygen</p> Signup and view all the answers

    What happens during electrolysis reactions?

    <p>An electric current triggers non-spontaneous reactions</p> Signup and view all the answers

    Which chemical reaction is responsible for turning nutrients into usable energy for the human body?

    <p>Digestion</p> Signup and view all the answers

    What is the main product of photosynthesis in plants?

    <p>Glucose</p> Signup and view all the answers

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