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Chemical Reaction: Chemical Change quiz

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  • What is a chemical reaction in terms of chemical bonds?
    A chemical reaction involves breaking chemical bonds in reactants and forming new bonds in products.
  • What are two observable evidences that a chemical reaction has occurred?
    A change in color and the formation of gas (bubbles) are observable evidences of a chemical reaction.
  • What does the formation of a precipitate indicate in a chemical reaction?
    The formation of a precipitate, which is a solid, indicates that a chemical reaction has taken place.
  • How can a change in temperature be evidence of a chemical reaction?
    A change in temperature, such as heating or cooling, can be observed during a chemical reaction, indicating that energy is being absorbed or released.
  • What is a chemical equation?
    A chemical equation is an expression that uses chemical formulas and symbols to represent a chemical reaction.
  • What does the arrow in a chemical equation represent?
    The arrow, called the reaction arrow, shows that reactants undergo a change to form products.
  • What does the triangle symbol (Δ) above the reaction arrow mean?
    The triangle symbol (Δ) indicates that heat is involved in the chemical reaction.
  • What does the symbol (s) mean in a chemical equation?
    The symbol (s) stands for solid, indicating the state of a compound in the reaction.
  • What does the symbol (l) mean in a chemical equation?
    The symbol (l) stands for liquid, indicating the compound is in the liquid state.
  • What does the symbol (g) mean in a chemical equation?
    The symbol (g) stands for gas, indicating the compound is in the gaseous state.
  • What does the symbol (aq) mean in a chemical equation?
    The symbol (aq) stands for aqueous, meaning the compound is dissolved in water.
  • Give an example of a chemical equation involving sodium bicarbonate.
    Sodium bicarbonate (solid) breaks down to give sodium carbonate (solid), water (liquid), and carbon dioxide (gas).
  • What is meant by the term 'aqueous' in chemistry?
    'Aqueous' means that a compound is dissolved in a solvent, usually water.
  • Why are chemical equations important in chemistry?
    Chemical equations are important because they use formulas and symbols to represent chemical reactions clearly and concisely.
  • What type of change is a chemical reaction classified as?
    A chemical reaction is classified as a chemical change.