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GOB Chemistry: Chemical Equations and Examples

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Termini in questo insieme (20)

  • What is a chemical equation?

    A chemical equation represents a chemical reaction using symbols and formulas of the reactants and products.

  • How do you balance a chemical equation?

    Adjust the coefficients of reactants and products to have the same number of each atom on both sides, obeying the law of conservation of mass.

  • Example: Balance the equation \(\mathrm{H_2 + O_2 \rightarrow H_2O}\)

    Balanced form: \(2\mathrm{H_2 + O_2 \rightarrow 2H_2O}\)

  • What does the coefficient in a chemical equation represent?

    The coefficient indicates the number of molecules or moles of a substance involved in the reaction.

  • Example: Balance \(\mathrm{N_2 + H_2 \rightarrow NH_3}\)

    Balanced equation: \(\mathrm{N_2 + 3H_2 \rightarrow 2NH_3}\)

  • What is the first step in balancing a chemical equation?

    Write the correct formulas for all reactants and products before adjusting coefficients.

  • Example: Balance \(\mathrm{C_3H_8 + O_2 \rightarrow CO_2 + H_2O}\)

    Balanced equation: \(\mathrm{C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O}\)

  • Why must chemical equations be balanced?

    To satisfy the law of conservation of mass, ensuring atoms are neither created nor destroyed.

  • Example: Balance \(\mathrm{Fe + O_2 \rightarrow Fe_2O_3}\)

    Balanced equation: \(4Fe + 3O_2 \rightarrow 2Fe_2O_3\)

  • What is a reactant in a chemical equation?

    A reactant is a substance that undergoes change during a chemical reaction, shown on the left side of the equation.

  • What is a product in a chemical equation?

    A product is a substance formed as a result of a chemical reaction, shown on the right side of the equation.

  • Example: Balance \(\mathrm{Al + O_2 \rightarrow Al_2O_3}\)

    Balanced equation: \(4Al + 3O_2 \rightarrow 2Al_2O_3\)

  • How do you check if a chemical equation is balanced?

    Count the number of atoms of each element on both sides; they must be equal.

  • Example: Balance \(\mathrm{Na + Cl_2 \rightarrow NaCl}\)

    Balanced equation: \(2Na + Cl_2 \rightarrow 2NaCl\)

  • What does the arrow in a chemical equation represent?

    The arrow (→) indicates the direction of the reaction, from reactants to products.

  • Example: Balance \(\mathrm{Mg + HCl \rightarrow MgCl_2 + H_2}\)

    Balanced equation: \(Mg + 2HCl \rightarrow MgCl_2 + H_2\)

  • What is the role of subscripts in chemical formulas?

    Subscripts show the number of atoms of each element in a molecule and cannot be changed when balancing.

  • Example: Balance \(\mathrm{KClO_3 \rightarrow KCl + O_2}\)

    Balanced equation: \(2KClO_3 \rightarrow 2KCl + 3O_2\)

  • What is a coefficient in a chemical equation?

    A coefficient is a number placed before a formula to indicate how many molecules or moles participate.

  • Example: Balance \(\mathrm{H_2SO_4 + NaOH \rightarrow Na_2SO_4 + H_2O}\)

    Balanced equation: \(H_2SO_4 + 2NaOH \rightarrow Na_2SO_4 + 2H_2O\)