C3.1.1 Conservation of Mass

• During a chemical reaction, atoms are not created or destroyed, but simply rearranged
• The Law of Conservation of Mass states that the total mass of the reactants is equal to the total mass of the products
• Atoms are not created or destroyed during a chemical reaction; they are merely rearranged
• In the combustion of methane, the balanced equation is CH4 + 2O2 → CO2 + 2H2O.


  True
• Match the chemical reaction with its balanced equation:

  Combustion of methane ↔️ CH4 + 2O2 → CO2 + 2H2O

  Decomposition of water ↔️ 2H2O → 2H2 + O2

  Neutralization of HCl with NaOH ↔️ HCl + NaOH → NaCl + H2O
• The Law of Conservation of Mass states that the total mass of the reactants equals the total mass of the products
• The total number and type of atoms remain constant before and after a chemical reaction.


  True
• Atoms are created during a chemical reaction.

  False
• In a balanced chemical equation, the number of each type of atom is the same on both sides.

  True
• During a chemical reaction, the total mass of the reactants must equal the total mass of the products
• The loss of gases during a reaction can reduce the observed mass
• A chemical reaction involves the breaking and rearranging of chemical bonds
• The total mass of methane and oxygen consumed equals the total mass of carbon dioxide and water
• The balanced equation for the combustion of methane is `CH4 + 2O2 → CO2 + 2H2O
• Match the component with its description:

  Reactants ↔️ Original substances at the beginning of the reaction

  Products ↔️ Substances formed by the reaction

  Law of Conservation of Mass ↔️ Total mass of reactants equals products

  Balanced Chemical Equation ↔️ Ensures equal atom counts
• Order the steps to mitigate factors affecting mass conservation:

  1️⃣ Conduct reactions in closed containers

  2️⃣ Use sealed systems

  3️⃣ Control conditions to minimize side reactions
• The balanced chemical equation for the combustion of methane is `CH4 + 2O2 → CO2 + 2H2O
• The Law of Conservation of Mass reflects the fundamental principle that matter cannot be created or destroyed.


  True
• During a chemical reaction, the total mass of the reactants equals the total mass of the products
• In the decomposition of water, the balanced equation is 2H2O → 2H2 + O2
• The total number and type of atoms remain constant before and after a chemical reaction.


  True
• In a chemical reaction, atoms are simply rearranged
• The Law of Conservation of Mass states that the total mass of the reactants is equal to the total mass of the products
• Balanced chemical equations demonstrate the Law of Conservation of Mass by showing that the total mass of the reactants equals the total mass of the products
• Match the reaction with its balanced chemical equation:

  Combustion of methane ↔️ CH4 + 2O2 → CO2 + 2H2O

  Decomposition of water ↔️ 2H2O → 2H2 + O2

  Neutralization of HCl and NaOH ↔️ HCl + NaOH → NaCl + H2O
• A balanced chemical equation ensures mass conservation.


  True
• Reactions in open systems always demonstrate mass conservation.

  False
• Atoms are created during a chemical reaction.

  False
• What law is demonstrated by balanced chemical equations?

  Law of Conservation of Mass
• The total number and type of atoms is the same on both sides of a balanced chemical equation.


  True
• The loss of gases during a reaction reduces the observed mass of the products
• Atoms are neither created nor destroyed during a chemical reaction.


  True