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Law of Conservation of Mass quiz #2 Flashcards

Law of Conservation of Mass quiz #2
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  • How does the water and sugar solution support the law of conservation of mass?
    The total mass of water and sugar before mixing equals the mass of the solution after mixing.
  • How does a chemical reaction obey the law of conservation of matter?
    By rearranging atoms without creating or destroying them.
  • What happens to the mass of substances during a chemical reaction?
    The mass remains unchanged; it is conserved.
  • In a chemical reaction is mass able to be destroyed or reduced?
    No, mass is not destroyed or reduced; it is conserved.
  • In a chemical reaction can matter be created or destroyed?
    No, matter is not created or destroyed; it is only transformed.
  • What does it mean that matter is conserved in physical and chemical changes?
    The total amount of matter stays the same; it is not lost or gained.
  • Which types of changes observe the law of conservation of mass?
    Both physical and chemical changes.
  • Is something new made in every chemical reaction?
    Yes, new substances are formed, but the total mass remains the same.
  • What does the law of conservation of mass say?
    It says that mass is conserved in all chemical reactions.
  • Who discovered the law of conservation of mass?
    Antoine Lavoisier.
  • Which of the following is true regarding the atoms involved in a chemical reaction?
    Atoms are rearranged but not created or destroyed.
  • What does the law of conservation of mass tell us?
    It tells us that the total mass of reactants equals the total mass of products.
  • Which of the following gets conserved in chemical reactions? Check all that apply.
    Mass and number of atoms are conserved.
  • Which chemical equation supports the law of conservation of matter?
    Any balanced equation, such as Mg + 2HCl → H2 + MgCl2.
  • Which of the following is true for all chemical reactions?
    Mass and number of atoms are conserved.
  • Are the atoms conserved during a chemical change even though new molecules are made?
    Yes, atoms are conserved; they are just rearranged.
  • In what year did French chemist Antoine Lavoisier describe the law of conservation of matter?
    In 1789.
  • Which of the following are conserved in every chemical reaction?
    Mass and number of atoms.
  • Does matter get destroyed in a fire?
    No, matter is not destroyed; it changes form.
  • What components of matter cannot be destroyed when a chemical reaction takes place?
    Atoms cannot be destroyed.
  • If matter is not being created or destroyed, what happens during a chemical reaction?
    Atoms are rearranged to form new substances.
  • How is the law of conservation of matter best represented in a chemical reaction?
    By a balanced chemical equation.
  • Which quantity or quantities must always be the same on both sides of a chemical equation?
    Total mass and number of each type of atom.
  • How is the law of conservation of mass related to balancing equations?
    Balancing equations ensures mass is conserved.
  • Why does the law of conservation of mass dictate that chemical equations be balanced?
    To show that the same number of each atom is present before and after the reaction.
  • Which of the following always results from a chemical reaction?
    New substances are formed, but mass is conserved.
  • Which of the following states the law of conservation of mass?
    Mass is neither created nor destroyed in a chemical reaction.
  • What does conserving mass mean in a chemical equation?
    It means the total mass of reactants equals the total mass of products.
  • What mass of methane gas (CH4) is required in order to follow the law of conservation of mass?
    The mass of CH4 must equal the mass of products formed, according to the balanced equation.
  • Which of the following equations represents the law of conservation of mass?
    Any balanced equation, such as CH4 + 2O2 → CO2 + 2H2O.
  • Which of the following statements is true about what happens during a chemical reaction?
    Atoms are rearranged, but mass is conserved.
  • Which of the following correctly describes the law of conservation of matter?
    Matter is not created or destroyed, only transformed.
  • What should the total mass of the jar and its contents be after the candle goes out?
    It should be the same as before the reaction, if the system is closed.
  • How did the Lavoisier's show that matter was not created or destroyed in a chemical reaction?
    By conducting experiments in closed systems and measuring mass before and after reactions.
  • How does the law of conservation of mass apply to this reaction: Mg + 2HCl → H2 + MgCl2?
    The total mass of Mg and HCl equals the total mass of H2 and MgCl2.
  • What is conserved in every chemical reaction?
    Mass and number of atoms.
  • What will be the total mass of the bag and its contents after the reaction?
    It will be the same as before the reaction, if the bag is sealed.
  • Which is true of any physical or chemical reaction?
    Mass is conserved.
  • What happens to the mass of substances during a chemical change?
    The mass remains unchanged.
  • Which of the following statements is true about what happens in all chemical reactions?
    Mass and number of atoms are conserved.