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

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

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

What is true about a chemical reaction?

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

What is an example of a compound?

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

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

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

What is the purpose of fermentation?

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

What is a visible sign of a chemical reaction?

<p>Change in color (A)</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) (D)</p> Signup and view all the answers

What is the career of someone who discovers new compounds?

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

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

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

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

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

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

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

What occurs during a chemical reaction?

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

What is a characteristic of a compound?

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

What is formed as a result of a chemical reaction?

<p>A product. (B)</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. (A)</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). (A)</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. (D)</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. (B)</p> Signup and view all the answers

What is the role of yeast in fermentation?

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

What is a common sign of a chemical reaction?

<p>All of the above. (D)</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. (D)</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 (A)</p> Signup and view all the answers

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

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

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

<p>Fermentation. (C)</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. (A)</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. (D)</p> Signup and view all the answers

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

<p>To balance the equation (C)</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 (C)</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 (A)</p> Signup and view all the answers

What is the purpose of fermentation in biochemical processes?

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

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

<p>C + O2 → CO2 (D)</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 (A)</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 (D)</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. (D)</p> Signup and view all the answers

What is the role of microorganisms in fermentation?

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

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

<p>All of the above. (D)</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. (C)</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. (A)</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. (C)</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. (D)</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. (D)</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 (B)</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 (A)</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 (C)</p> Signup and view all the answers

What is the characteristic of a compound?

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

What is the symbolic representation of a chemical reaction?

<p>A chemical equation (D)</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 (C)</p> Signup and view all the answers

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

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

What is the purpose of fermentation in biochemical processes?

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

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

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

What is the role of microorganisms in fermentation?

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

What is the common application of chemistry in various careers?

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

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

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

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

<p>Change in color (C)</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 (D)</p> Signup and view all the answers

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