Balancing of Chemical Equation

• chemical notation - standard way of writing chemical formula.
• coefficient - a numerical number attached in front of the chemical formula.
• subscript - number written in the lower right side of the chemical formula.
• parentheses - used to form subgroups of atoms within molecules.
• Law of Conservation of Mass - states that no matter can be created or destroyed.
• What are the coefficients needed to balance the chemical equation below?

  2, 3, 3, 1

  
• Law of conservation of mass - State that the total mass of the reactant must be equal to the total mass in the product.
• Which of the following set of coefficients would balance the given equation? Al + Fe(NO3)2 → Al(NO3)3 + Fe.

  2, 3, 2, 3
• In the chemical formula Mg(NO3)2, the numerical coefficient is equal to:

  1
• In a chemical reaction, what is the relationship between the total mass of the reactants and the total mass of the products?

  They must be equal.
• In balancing a chemical equation, which of the following are you allowed to do?

  write coefficients
• The reaction between sodium atom and chlorine gas forming table salt can be expressed in this equation, Na(s) + Cl2(g) → NaCI(s). To balance the equation, what are the coefficients needed in the given order for sodium, chlorine and table salt?

  2, 1, 2
• To balance the equation NO2 → N2 + 02, what are the coefficients needed in the given order for nitrogen and oxygen?

  2, 1, 2
• What type of reaction is represented by the following chemical equation? Pb(s) + FeSO4(aq) → PbSO4(s) + Fe(s)

  Single replacement
• What general equation represents a decomposition reaction?

  AB → A + B