Gr 8 Natural Sciences Ch 2.3: Reactants and products
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Questions and Answers

What is a reactant in a chemical reaction?

  • A substance that takes part in and undergoes change during a chemical reaction (correct)
  • A substance that is not involved in a chemical reaction
  • A substance that is a product of a biological reaction
  • A substance that is formed as the result of a chemical reaction

    • What is the term for the numbers placed before the formulae in a chemical equation?

  • Formulas
  • Subscripts
  • Superscripts
  • Coefficients (correct)

    • What is the product of the reaction between carbon and oxygen?

  • Carbon dioxide (correct)
  • Carbon monoxide
  • Oxygen dioxide
  • Carbon oxide

    • What is the definition of a compound?

    <p>A substance made up of two or more different elements that are chemically bonded together</p> Signup and view all the answers

    What is fermentation?

    <p>A metabolic process that produces chemical changes in organic substrates through the action of enzymes</p> Signup and view all the answers

    What is the term for the symbolic representation of a chemical reaction?

    <p>Chemical equation</p> Signup and view all the answers

    What is true about a chemical reaction?

    <p>Atoms are rearranged to form new compounds</p> Signup and view all the answers

    What is an example of a compound?

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

    What is the product of the combustion reaction between hydrogen and oxygen?

    <p>Water (H2O)</p> Signup and view all the answers

    What is the purpose of fermentation?

    <p>To produce alcohol and carbon dioxide</p> Signup and view all the answers

    What is a visible sign of a chemical reaction?

    <p>Change in color</p> Signup and view all the answers

    What is the product of the reaction between ammonium dichromate and oxygen?

    <p>Water (H2O) and chromium oxide (Cr2O3)</p> Signup and view all the answers

    What is the career of someone who discovers new compounds?

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

    Who is the renowned chemist and physicist known for her research on radioactivity?

    <p>Marie Curie</p> Signup and view all the answers

    What is the reactant in the combustion reaction between hydrogen and oxygen?

    <p>Hydrogen gas (H2)</p> Signup and view all the answers

    What is the equation for the reaction between glucose and yeast?

    <p>C6H12O6 → 2C2H5OH + 2CO2</p> Signup and view all the answers

    What occurs during a chemical reaction?

    <p>Atoms are rearranged to form new compounds.</p> Signup and view all the answers

    What is the result of the reaction between carbon and oxygen?

    <p>One atom of carbon and one molecule of carbon dioxide.</p> Signup and view all the answers

    What is a characteristic of a compound?

    <p>It is composed of at least two different elements.</p> Signup and view all the answers

    What do coefficients in a chemical equation represent?

    <p>The number of units of each substance involved in the reaction.</p> Signup and view all the answers

    What is formed as a result of a chemical reaction?

    <p>A product.</p> Signup and view all the answers

    What is the process of producing chemical changes in organic substrates through the action of enzymes?

    <p>Fermentation.</p> Signup and view all the answers

    What is an example of a compound that is composed of hydrogen and oxygen?

    <p>Water (H_2O).</p> Signup and view all the answers

    What is the term for the substances that take part in and undergo change during a chemical reaction?

    <p>Reactants.</p> Signup and view all the answers

    What is a characteristic of a combustion reaction?

    <p>It involves the formation of new bonds between atoms.</p> Signup and view all the answers

    What is the role of yeast in fermentation?

    <p>To convert sugars into alcohol and carbon dioxide.</p> Signup and view all the answers

    What is a common sign of a chemical reaction?

    <p>All of the above.</p> Signup and view all the answers

    What is the purpose of chemistry in various careers?

    <p>To discover new compounds and develop new medicines.</p> Signup and view all the answers

    What is the equation for the reaction between ammonium dichromate and oxygen?

    <p>(NH4)2Cr2O7 → N2 + 4H2O + Cr2O3</p> Signup and view all the answers

    What is the product of the reaction between hydrogen and oxygen?

    <p>Water only.</p> Signup and view all the answers

    What is the common name for the reaction between glucose and yeast?

    <p>Fermentation.</p> Signup and view all the answers

    What is the significance of Marie Curie's work?

    <p>She won Nobel Prizes in two different scientific fields.</p> Signup and view all the answers

    In a chemical reaction, what is the primary difference between reactants and products?

    <p>Reactants are broken down, while products are formed.</p> Signup and view all the answers

    What is the main purpose of coefficients in a chemical equation?

    <p>To balance the equation</p> Signup and view all the answers

    What is the result of the rearrangement of atoms in a chemical reaction?

    <p>Formation of new compounds</p> Signup and view all the answers

    What is the primary difference between a compound and a mixture?

    <p>A compound has a fixed ratio of elements, while a mixture does not</p> Signup and view all the answers

    What is the purpose of fermentation in biochemical processes?

    <p>To produce ethanol and acids</p> Signup and view all the answers

    What is the symbolic representation of the reaction between carbon and oxygen?

    <p>C + O2 → CO2</p> Signup and view all the answers

    What is the term for the process of forming a new compound from two or more different elements?

    <p>Compound formation</p> Signup and view all the answers

    What is the result of the breaking of bonds in the reactants during a chemical reaction?

    <p>Formation of new bonds in the products</p> Signup and view all the answers

    What is the primary difference between combustion and fermentation reactions?

    <p>Combustion reactions involve the formation of new bonds, while fermentation reactions involve the breaking of existing bonds.</p> Signup and view all the answers

    What is the role of microorganisms in fermentation?

    <p>They convert sugars into alcohol and carbon dioxide.</p> Signup and view all the answers

    What is the characteristic of a chemical reaction that is visually spectacular?

    <p>All of the above.</p> Signup and view all the answers

    What is the product of the reaction between hydrogen and oxygen in the presence of a spark?

    <p>Water and heat.</p> Signup and view all the answers

    What is the significance of Marie Curie's work?

    <p>She was the first woman to win a Nobel Prize in two different scientific fields.</p> Signup and view all the answers

    What is the role of yeast in the reaction between glucose and oxygen?

    <p>It converts glucose into ethanol and carbon dioxide.</p> Signup and view all the answers

    What is the difference between a combustion reaction and a chemical reaction?

    <p>Combustion reactions are a type of chemical reaction, but not all chemical reactions are combustion reactions.</p> Signup and view all the answers

    What is the purpose of chemistry in various careers?

    <p>To discover new compounds and improve existing products.</p> Signup and view all the answers

    What occurs when bonds are broken in the reactants during a chemical reaction?

    <p>Atoms are rearranged to form new bonds</p> Signup and view all the answers

    What is the primary purpose of coefficients in a chemical equation?

    <p>To indicate the number of units of each substance involved in the reaction</p> Signup and view all the answers

    What is the result of the rearrangement of atoms in a chemical reaction?

    <p>The formation of new compounds</p> Signup and view all the answers

    What is the characteristic of a compound?

    <p>It is composed of two or more different elements</p> Signup and view all the answers

    What is the difference between reactants and products in a chemical equation?

    <p>Reactants are the substances that undergo change, while products are the resulting substances</p> Signup and view all the answers

    What is the purpose of fermentation?

    <p>To produce chemical changes in organic substrates through the action of enzymes</p> Signup and view all the answers

    What is the symbolic representation of a chemical reaction?

    <p>A chemical equation</p> Signup and view all the answers

    What occurs during a chemical reaction?

    <p>The arrangement of atoms in the reactants is rearranged to form new bonds</p> Signup and view all the answers

    What type of chemical reaction occurs when coal burns in oxygen?

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

    What is the purpose of fermentation in biochemical processes?

    <p>To produce carbon dioxide and ethanol</p> Signup and view all the answers

    What is the visible sign of the reaction between ammonium dichromate and oxygen?

    <p>Bright orange sparks</p> Signup and view all the answers

    What is the role of microorganisms in fermentation?

    <p>To convert sugars into ethanol and carbon dioxide</p> Signup and view all the answers

    What is the common application of chemistry in various careers?

    <p>All of the above</p> Signup and view all the answers

    What is the result of the reaction between hydrogen and oxygen?

    <p>Formation of water</p> Signup and view all the answers

    What is the characteristic of a chemical reaction that is visually spectacular?

    <p>Change in color</p> Signup and view all the answers

    What is the significance of Marie Curie's work?

    <p>She was the first woman to win a Nobel Prize in two different scientific fields</p> Signup and view all the answers

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