Understanding Thermal Decomposition

What is thermal decomposition?

• Thermal decomposition refers to the cooling of a substance to form a solid.

• Thermal decomposition is the breakdown of a chemical compound into simpler substances due to heat.

• Thermal decomposition is the reaction of a compound with water to form new products.

• Thermal decomposition is the process of combining two substances using heat.

Which of the following is an example of thermal decomposition?

• Decomposition of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2) when heated.

• Decomposition of sodium chloride (NaCl) into sodium (Na) and chlorine (Cl2) when heated.

• Decomposition of glucose (C6H12O6) into carbon dioxide (CO2) and water (H2O) when heated.

• Decomposition of water (H2O) into hydrogen (H2) and oxygen (O2) when heated.

What happens to a compound during thermal decomposition?

• A compound breaks down into simpler substances or elements when heated.

• A compound becomes more complex when heated.

• A compound remains unchanged during heating.

• A compound turns into a gas without breaking down.

How does thermal decomposition differ from combustion?

• Thermal decomposition requires high temperatures, while combustion occurs at low temperatures.

• Thermal decomposition involves breaking down compounds without oxygen, while combustion involves rapid reaction with oxygen.

• Combustion produces only solid residues, whereas thermal decomposition produces gases.

• Thermal decomposition is a slow process, while combustion is always a slow reaction.

Which gas is often released during the thermal decomposition of calcium carbonate?

• Oxygen (O2)

• Nitrogen (N2)

• Carbon dioxide (CO2)

• Hydrogen (H2)

What is the main characteristic of thermal decomposition reactions?

• They produce energy without any reactants.

• They only occur at low temperatures.

• They require a catalyst to proceed.

• They involve the breakdown of a compound into simpler substances upon heating.

Can thermal decomposition occur without heat? Why or why not?

• No, thermal decomposition cannot occur without heat.

• Yes, thermal decomposition can occur without heat if pressure is applied.

• Thermal decomposition can happen spontaneously at room temperature.

• Thermal decomposition requires only light, not heat.

What is one common use of thermal decomposition in industry?

• Creating plastic from crude oil

• Manufacturing glass from sand

• Producing steel from iron ore

• Production of lime from limestone

Which of the following is NOT a thermal decomposition reaction?

• Combustion reaction

• Synthesis reaction

• Single displacement reaction

• Neutralization reaction

What type of energy is primarily involved in thermal decomposition?

• Chemical energy

• Kinetic energy

• Thermal energy

• Potential energy