Thermal decomposition

The video explains thermal decomposition, a process where substances break down when heated. It uses calcium carbonate as an example, which decomposes into calcium oxide and carbon dioxide. The process is typically endothermic, meaning it absorbs heat.

What happens to substances when they are heated?

• They turn into gas.

• They always melt.

• They may undergo a chemical reaction.

• They become colder.

What are the products when calcium carbonate is heated?

• Calcium oxide and water

• Calcium oxide and carbon dioxide

• Calcium and oxygen

• Carbon and oxygen

Which of the following is a result of heating calcium carbonate?

• Formation of calcium hydroxide

• Creation of calcium sulfate

• Release of carbon monoxide

• Production of calcium oxide

What type of reaction is thermal decomposition?

• Spontaneous

• Neutral

• Endothermic

• Exothermic

Which statement is true about endothermic reactions?

• They absorb heat.

• They occur without heat.

• They do not involve heat.

• They release heat.