Chemical Equation Concepts

What is the purpose of balancing a chemical equation?

• To speed up the reaction

• To ensure the law of conservation of mass is obeyed.

• To balance the pH level

• To create a chemical reaction

Identify the type of chemical reaction: 2H₂ + O₂ → 2H₂O

• Decomposition reaction

• Combustion reaction

• Synthesis reaction

• Single displacement reaction

In the equation CH₄ + 2O₂ → CO₂ + 2H₂O, what are the reactants?

• CH₄ and CO₂

• CH₄ and O₂

• O₂ and H₂O

• CO₂ and H₂O

What does the coefficient '2' in 2H₂O represent?

• Amount of hydrogen atoms

• Number of water molecules

• Atomic weight of oxygen

• Type of bond

State the Law of Conservation of Mass in relation to chemical equations.

• Total mass of products = Total mass of reactants

• Total mass of reactants = Total mass of products

• Total mass of reactants = Total mass of products

• Total mass of reactants = Total mass of reactants

Balance the equation: Al + O₂ → Al₂O₃

• 2Al + 3O₂ → 2Al₂O₃

• 3Al + 2O₂ → 3Al₂O₃

• Al + O₂ → AlO₃

• 2Al + 2O₂ → 2Al₂O₃

What type of chemical reaction is represented by the equation: 2NaCl → 2Na + Cl₂

• Single displacement reaction

• Decomposition reaction

• Synthesis reaction

• Combustion reaction

In the equation 4Fe + 3O₂ → 2Fe₂O₃, what are the products?

• Iron hydroxide (Fe(OH)3)

• Iron chloride (FeCl)

• Iron oxide (Fe₂O₃)

• Iron sulfide (FeS)

Explain the significance of coefficients in chemical equations.

• Coefficients in chemical equations control the temperature of the reaction.

• Coefficients in chemical equations balance the number of atoms of each element on both sides of the equation.

• Coefficients in chemical equations affect the taste of the products.

• Coefficients in chemical equations determine the color of the resulting solution.

Balance the equation: C₆H₁₂O₆ → C₂H₅OH + CO₂

• C₆H₁₂O₆ → C₂H₅OH + 2CO₂

• C₆H₁₂O₆ → 2C₂H₅OH + CO

• C₆H₁₂O₆ → 3C₂H₅OH + 3CO₂

• C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂