Gr 8 Natural Sciences Ch 2.3: SUM: Chemical reactions
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Questions and Answers

What is the primary product of fermentation?

  • Ethanol (correct)
  • Glucose
  • Oxygen
  • Carbon dioxide

    • What is the reactant in the fermentation reaction example?

  • Ethanol
  • Yeast
  • Carbon dioxide
  • Glucose (correct)

    • What is a common indicator of a chemical reaction?

  • The production of sound
  • The formation of a solid
  • The production of a liquid
  • A change in color (correct)

    • What is the product of the ammonium dichromate volcano reaction?

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

    What is a field of science that involves the use of chemistry?

    <p>Environmental science</p> Signup and view all the answers

    What is a common task of chemists?

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

    What was Marie Curie known for?

    <p>Her research on radioactivity</p> Signup and view all the answers

    What is a unique achievement of Marie Curie?

    <p>She was the first woman to win a Nobel Prize</p> Signup and view all the answers

    What is the gas produced in the reaction between baking soda and vinegar?

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

    What is the purpose of the vinegar in the eggshell removal activity?

    <p>To dissolve the eggshell</p> Signup and view all the answers

    What happens to particles during a chemical reaction?

    <p>They break their bonds and form new bonds</p> Signup and view all the answers

    What is a reactant in a chemical reaction?

    <p>A substance that takes part in and undergoes change during a chemical reaction</p> Signup and view all the answers

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

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

    What is the chemical equation for the reaction between carbon and oxygen?

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

    What is the result of a chemical reaction?

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

    What is fermentation?

    <p>A metabolic process that produces chemical changes</p> Signup and view all the answers

    What is the definition of a compound?

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

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

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

    What occurs during a chemical reaction?

    <p>Breaking and forming chemical bonds</p> Signup and view all the answers

    What is a reaction flask or reaction vessel?

    <p>A container used to carry out a chemical reaction</p> Signup and view all the answers

    What is an indication of a chemical reaction?

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

    What is a precipitate?

    <p>A solid material formed during a reaction</p> Signup and view all the answers

    What sense can help us identify chemical reactions?

    <p>Sight, smell, heat, and sound</p> Signup and view all the answers

    What type of reaction releases heat?

    <p>Exothermic reaction</p> Signup and view all the answers

    What is an example of a chemical reaction that produces a distinct smell?

    <p>Formation of hydrogen sulfide gas</p> Signup and view all the answers

    What do bubbles in the reaction flask indicate?

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

    What occurs when the acetic acid in vinegar reacts with the calcium carbonate in the eggshell?

    <p>The eggshell dissolves, releasing carbon dioxide gas and forming calcium acetate</p> Signup and view all the answers

    Which of the following best describes what happens to the bonds in a chemical reaction?

    <p>Old bonds are broken, and new bonds are formed</p> Signup and view all the answers

    What is the 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 term for the substance formed as a result of a chemical reaction?

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

    What is an example of a compound?

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

    Which of the following chemical reactions releases heat?

    <p>Reaction between carbon and oxygen</p> Signup and view all the answers

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

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

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

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

    What is the term for the process of breaking bonds in the reactants and forming new bonds in the products?

    <p>Rearrangement of Atoms</p> Signup and view all the answers

    What is the term for a substance that takes part in and undergoes change during a chemical reaction?

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

    What is the primary transformation that occurs during a chemical reaction?

    <p>Breaking and forming chemical bonds</p> Signup and view all the answers

    Which of the following is NOT a sign of a chemical reaction?

    <p>Boiling of the reactants</p> Signup and view all the answers

    What is the term for the solid material that forms in a reaction flask during a chemical reaction?

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

    Which sense can help us identify chemical reactions through a distinct smell?

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

    What is the term for a container used to carry out a chemical reaction?

    <p>Reaction vessel</p> Signup and view all the answers

    What type of reaction involves the release of heat?

    <p>Exothermic reaction</p> Signup and view all the answers

    What is the result of a chemical reaction in terms of the chemical composition of the reactants?

    <p>The reactants are transformed into new substances</p> Signup and view all the answers

    What is a common error to avoid when identifying gas formation in a reaction flask?

    <p>Confusing it with boiling</p> Signup and view all the answers

    What is the primary purpose of fermentation in food production?

    <p>To preserve food and create new products</p> Signup and view all the answers

    What is the role of yeast in the fermentation reaction?

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

    What is a common characteristic of chemical reactions?

    <p>They can produce unique and noticeable changes</p> Signup and view all the answers

    What is the profession of individuals who discover new compounds and develop new materials?

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

    What is the significance of Marie Curie's research?

    <p>She was a pioneer in the study of radioactivity</p> Signup and view all the answers

    What is the equation for the fermentation reaction?

    <p>C_6H_{12}O_6 → 2C_2H_5OH + 2CO_2</p> Signup and view all the answers

    What is the product of the ammonium dichromate volcano reaction?

    <p>Nitrogen gas, water, and dark green chromium oxide</p> Signup and view all the answers

    What is the significance of the ammonium dichromate volcano reaction?

    <p>It is a demonstration of a chemical reaction</p> Signup and view all the answers

    What is the primary indicator of a chemical reaction in the reaction flask?

    <p>A change in colour</p> Signup and view all the answers

    What is the term for the solid material that forms in a reaction flask during a chemical reaction?

    <p>A precipitate</p> Signup and view all the answers

    What is the purpose of using our senses to identify chemical reactions?

    <p>To detect changes in the properties of the substances involved</p> Signup and view all the answers

    What is the term for a container used to carry out a chemical reaction?

    <p>A reaction flask or reaction vessel</p> Signup and view all the answers

    What is the result of a chemical reaction in terms of the chemical composition of the reactants?

    <p>A change in chemical composition</p> Signup and view all the answers

    What is an example of a chemical reaction that involves the formation of a gas?

    <p>The reaction between baking soda and vinegar</p> Signup and view all the answers

    What is the term for a process in which substances are transformed into new substances with different chemical properties?

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

    What is an example of a chemical reaction that produces a distinct smell?

    <p>The reaction that produces hydrogen sulfide gas</p> Signup and view all the answers

    What is the primary role of microorganisms like yeast in fermentation?

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

    What is a common indicator of a chemical reaction, as observed in the ammonium dichromate volcano reaction?

    <p>A change in color and the production of gas</p> Signup and view all the answers

    What is the significance of Marie Curie's research in the field of chemistry?

    <p>She was a pioneer in the study of radioactivity</p> Signup and view all the answers

    What is the primary application of fermentation in food production?

    <p>To preserve food and produce fermented foods and beverages</p> Signup and view all the answers

    What is the result of the chemical reaction between glucose and yeast in fermentation?

    <p>The production of ethanol and carbon dioxide</p> Signup and view all the answers

    What is the primary role of chemists in their field of work?

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

    What is a common application of chemistry in different fields?

    <p>In various fields, including medicine, environmental science, and materials science</p> Signup and view all the answers

    What is the result of the reaction between the acetic acid in vinegar and the calcium carbonate in the eggshell?

    <p>The production of carbon dioxide gas and water</p> Signup and view all the answers

    What is the chemical equation for the fermentation reaction?

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

    What is the role 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 outcome of a chemical reaction in terms of the chemical composition of the reactants?

    <p>The reactants are transformed into products with different properties</p> Signup and view all the answers

    What is the process of breaking bonds in the reactants and forming new bonds in the products?

    <p>Rearrangement of atoms</p> Signup and view all the answers

    What is the term for the substance that takes part in and undergoes change during a chemical reaction?

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

    What is the purpose of the eggshell removal activity?

    <p>To remove the shell of a raw egg without breaking it</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 occurs during a chemical reaction in terms of the bonds between atoms?

    <p>The bonds between atoms are broken and new bonds are formed</p> Signup and view all the answers

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

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

    What is the primary transformation that occurs during a chemical reaction?

    <p>The rearrangement of atoms to form new compounds</p> Signup and view all the answers

    What is the primary difference between a chemical reaction and boiling?

    <p>The formation of gas bubbles</p> Signup and view all the answers

    Which of the following senses is NOT typically used to identify a chemical reaction?

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

    What is the term for the process of breaking and forming chemical bonds during a chemical reaction?

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

    What is the primary purpose of a reaction flask or reaction vessel?

    <p>To contain and carry out a chemical reaction</p> Signup and view all the answers

    Which of the following is an example of a chemical reaction that produces a solid?

    <p>The reaction between calcium carbonate and acetic acid</p> Signup and view all the answers

    What is the term for the substances that undergo a transformation during a chemical reaction?

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

    Which of the following is a common indicator of an exothermic reaction?

    <p>The release of heat</p> Signup and view all the answers

    What is the term for the new substances formed during a chemical reaction?

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

    What is the primary mechanism by which the acetic acid in vinegar reacts with the calcium carbonate in the eggshell?

    <p>Acid-base reaction</p> Signup and view all the answers

    What is the role of coefficients in a chemical equation?

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

    What is the significance of the reaction between hydrogen gas and oxygen gas?

    <p>It produces water, which is essential for life</p> Signup and view all the answers

    What is the primary characteristic of a chemical reaction?

    <p>It involves the rearrangement of atoms</p> Signup and view all the answers

    What is the term for the process of breaking bonds in the reactants and forming new bonds in the products?

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

    What is the primary purpose of a chemical equation?

    <p>To represent the reactants and products in a chemical reaction</p> Signup and view all the answers

    What is the term for a substance that is formed as a result of a chemical reaction?

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

    What is the primary difference between a reactant and a product?

    <p>A reactant is a substance that is consumed, while a product is a substance that is formed</p> Signup and view all the answers

    What is the term for the container used to carry out a chemical reaction?

    <p>Reaction vessel</p> Signup and view all the answers

    What is the primary characteristic of a combustion reaction?

    <p>It involves the release of heat</p> Signup and view all the answers

    What is the primary purpose of the fermentation reaction in the production of ethanol?

    <p>To convert sugars into a molecule that can be used as a fuel</p> Signup and view all the answers

    Which of the following is a characteristic of chemical reactions that can be observed?

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

    What is the primary role of microorganisms such as yeast in the fermentation reaction?

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

    Which of the following careers involves the use of chemistry to develop new materials?

    <p>Materials scientist</p> Signup and view all the answers

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

    <p>(NH_4)_2Cr_2O_7 → N_2 + 4H_2O + Cr_2O_3</p> Signup and view all the answers

    What is the primary application of chemistry in the field of medicine?

    <p>Developing new medical treatments</p> Signup and view all the answers

    Which of the following is a characteristic of the reaction between ammonium dichromate and oxygen?

    <p>It produces bright orange sparks</p> Signup and view all the answers

    What is the significance of Marie Curie's research in the field of chemistry?

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

    What is the byproduct of fermentation, in addition to ethanol?

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

    Which of the following is a characteristic of a chemical reaction?

    <p>Formation of gas or a change in color</p> Signup and view all the answers

    What is the role of chemists in their careers?

    <p>To discover new compounds, develop new materials, and find ways to improve existing products</p> Signup and view all the answers

    What is the significance of Marie Curie's research?

    <p>It led to an understanding of radioactivity</p> Signup and view all the answers

    What is the purpose of the ammonium dichromate volcano reaction?

    <p>To demonstrate chemical reactions and the formation of specific products</p> Signup and view all the answers

    During fermentation, what is the primary source of energy for the microorganisms?

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

    Which of the following is a characteristic of chemical reactions that can be used to identify them?

    <p>Color change</p> Signup and view all the answers

    What is the primary application of chemistry in the field of medicine?

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

    What is the primary purpose of the ammonium dichromate volcano reaction?

    <p>To create a visually spectacular reaction</p> Signup and view all the answers

    What is the significance of Marie Curie's research in the field of chemistry?

    <p>She was a pioneer in the field of radioactivity</p> Signup and view all the answers

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