Chemical Equations: Types and Balancing
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Questions and Answers

What is a chemical equation?

  • A long way of expressing chemical change in terms of symbols and formulas
  • A symbolic representation of a chemical reaction (correct)
  • A diagram representing a chemical reaction
  • A way of representing physical changes

    • Where are the formulas of the reactants placed in a chemical equation?

  • Before the arrow
  • On the left side (correct)
  • On the right side
  • After the arrow

    • What separates individual reactant and product formulas in a chemical equation?

  • Equal signs (=)
  • Arrow (⟶)
  • Hyphens (-)
  • Plus signs (+) (correct)

    • What do coefficients represent in a chemical equation?

    <p>The relative numbers of reactant and product species (A)</p> Signup and view all the answers

    What is omitted when the coefficient is 1 in a chemical equation?

    <p>The coefficient (A)</p> Signup and view all the answers

    In a chemical equation, what are the substances generated by the reaction called?

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

    What symbol is used to separate two or more reactants or products in a chemical equation?

    <ul> <li>(A)</li> </ul> Signup and view all the answers

    What does the symbol '∆' mean in the context of writing an equation?

    <p>Heat is applied (B)</p> Signup and view all the answers

    What is the purpose of balancing chemical equations?

    <p>To know the weight of the substances produced (C)</p> Signup and view all the answers

    According to the law of conservation of mass, what should be equal in a chemical reaction?

    <p>The number of atoms in each element (A)</p> Signup and view all the answers

    What do coefficients represent in a chemical equation?

    <p>The number of moles of each substance involved in the reaction (B)</p> Signup and view all the answers

    What type of chemical reaction involves the direct union of substances?

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

    In a reversible reaction, which symbol indicates that the reaction can proceed in either direction?

    <p>&lt;--&gt; (D)</p> Signup and view all the answers

    What does 'NR' mean in the context of writing a chemical equation?

    <p>No reaction takes place (C)</p> Signup and view all the answers

    What type of chemical reaction involves the breaking down of a compound into simpler substances?

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

    Which term refers to the left side of a chemical equation where the formulas of the reactants are placed?

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

    What type of chemical reaction involves the exchange of positive ions between two compounds?

    <p>Precipitation reaction (C)</p> Signup and view all the answers

    In a chemical equation, what does the coefficient 2 in front of a formula represent?

    <p>Two molecules of the substance (C)</p> Signup and view all the answers

    Which symbol is used to indicate that heat is supplied to initiate or drive a chemical reaction?

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

    What is the purpose of including state symbols in a chemical equation, such as (s), (l), and (g)?

    <p>To specify the phase of matter for each substance (A)</p> Signup and view all the answers

    What does 'NR' represent in the context of writing a chemical equation?

    <p>No reaction takes place (C)</p> Signup and view all the answers

    What does the symbol '∆' mean in the context of writing an equation?

    <p>Heat is applied (D)</p> Signup and view all the answers

    In a reversible reaction, which symbol indicates that the reaction can proceed in either direction?

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

    According to the law of conservation of mass, what should be equal in a chemical reaction?

    <p>The mass of the products (B)</p> Signup and view all the answers

    What separates individual reactant and product formulas in a chemical equation?

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

    What is omitted when the coefficient is 1 in a chemical equation?

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

    What type of chemical reaction involves the breaking down of a compound into simpler substances?

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

    In a chemical equation, what are the substances generated by the reaction called?

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

    What do coefficients represent in a chemical equation?

    <p>The number of molecules or atoms (A)</p> Signup and view all the answers

    Where are the formulas of the reactants placed in a chemical equation?

    <p>On the left side (B)</p> Signup and view all the answers

    What symbol is used to separate two or more reactants or products in a chemical equation?

    <ul> <li>(B)</li> </ul> Signup and view all the answers

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