1.1.3 Chemical Equations

• What are reactants in a chemical equation?

  Molecules that start the reaction
• Steps to balance the chemical equation: N₂ + H₂ → NH₃

  1️⃣ Identify elements that need balancing

  2️⃣ Balance nitrogen (N) on both sides

  3️⃣ Balance hydrogen (H) by adjusting its coefficient

  4️⃣ Verify if all elements are balanced
• What is the general formula for a synthesis reaction?

  A + B → AB
• What is the general formula for a double displacement reaction?

  AB + CD → AD + CB
• The reaction 2H₂ + O₂ → 2H₂O is an example of a synthesis reaction.


  True
• The general formula for a single displacement reaction is A + BC → AC + B
• The general formula for a double displacement reaction is AB + CD → AD + CB
• In a chemical equation, reactants are the molecules that start the reaction
• The products in the reaction CH₄ + 2O₂ → CO₂ + 2H₂O are CO₂ and H₂O
• Steps for balancing the equation N₂ + H₂ → NH₃

  1️⃣ Identify elements that need balancing

  2️⃣ Balance nitrogen (N) on both sides

  3️⃣ Balance hydrogen (H) by adjusting H₂

  4️⃣ Verify if all elements are balanced
• Match the type of chemical equation with its example:

  Synthesis ↔️ 2H₂ + O₂ → 2H₂O

  Decomposition ↔️ 2H₂O → 2H₂ + O₂

  Single Displacement ↔️ Zn + CuSO₄ → ZnSO₄ + Cu

  Double Displacement ↔️ AgNO₃ + NaCl → AgCl + NaNO₃
• What is a chemical equation?

  Symbolic representation of a reaction
• What are products in a chemical equation?

  Molecules formed after the reaction
• Physical states in a chemical equation are represented by symbols like (s), (l), (g), and (aq).


  True
• What is the general formula for a decomposition reaction?

  AB → A + B
• What type of chemical reaction involves two or more reactants combining to form a single product?

  Synthesis
• What type of chemical reaction involves a single reactant breaking down into two or more products?

  Decomposition
• The reaction 2H₂O → 2H₂ + O₂ is an example of a decomposition reaction.


  True
• The reaction Zn + CuSO₄ → ZnSO₄ + Cu is an example of a single displacement reaction.


  True
• The reaction AgNO₃ + NaCl → AgCl + NaNO₃ is an example of a double displacement reaction.


  True
• The arrow (→) in a chemical equation indicates the direction of the reaction.


  True
• Coefficients in a chemical equation ensure the law of conservation of mass is followed.


  True
• To balance nitrogen in the equation N₂ + H₂ → NH₃, the coefficient in front of NH₃ should be 2
• What law is ensured by balancing chemical equations?

  Law of conservation of mass
• To balance hydrogen in the equation CH₄ + O₂ → CO₂ + H₂O, the coefficient in front of H₂O should be 2
• In a chemical equation, the arrow (→) indicates the direction of the reaction
• Coefficients in a chemical equation ensure the law of conservation of mass
• Match the components of a chemical equation with their explanations:

  Reactants ↔️ Molecules before the reaction

  Products ↔️ Molecules formed after the reaction

  Arrow ↔️ Indicates reaction direction

  Coefficients ↔️ Balances the equation
• In a single displacement reaction, one element replaces another in a compound
• The general formula for a synthesis reaction is A + B → AB
• The general formula for a decomposition reaction is AB → A + B
• What type of chemical reaction involves one element replacing another in a compound?

  Single Displacement
• What type of chemical reaction involves two compounds exchanging ions to form two new compounds?

  Double Displacement
• Define a chemical equation.

  Symbolic representation of a reaction
• What are reactants in the reaction CH₄ + 2O₂ → CO₂ + 2H₂O?

  CH₄, O₂
• What is the primary goal of balancing chemical equations?

  Equal number of atoms
• What are the components of a chemical equation besides reactants, products, coefficients, and the arrow?

  Physical states
• Steps for balancing the equation CH₄ + O₂ → CO₂ + H₂O

  1️⃣ Identify the elements needing balancing

  2️⃣ Balance carbon (C): There is one carbon atom on each side, so it is balanced

  3️⃣ Balance hydrogen (H) by adjusting H₂O

  4️⃣ Balance oxygen (O) by adjusting O₂

  5️⃣ Verify if all elements are balanced