Decomposition of Copper(II) Carbonate

The video demonstrates the decomposition of copper(II) carbonate into copper(II) oxide and carbon dioxide gas. The process involves heating copper(II) carbonate in a test tube over a blue flame while ensuring safety by pointing the test tube away from oneself and others. As the compound heats, it begins to bubble, indicating the release of carbon dioxide. The presence of carbon dioxide is confirmed by extinguishing a lit splint held at the test tube's mouth. Additionally, the video notes that the flame may turn green due to copper residue on the splint, which is a normal occurrence.

What are the products of the decomposition of copper(II) carbonate?

• Copper(II) sulfate and water

• Copper(II) oxide and carbon dioxide

• Copper(II) chloride and oxygen

• Copper(II) nitrate and nitrogen dioxide

What safety precaution should be taken when heating the test tube?

• Point the test tube towards yourself

• Use a plastic test tube

• Point the test tube away from yourself and others

• Hold the test tube with bare hands

What indicates the presence of carbon dioxide during the experiment?

• The lit splint produces smoke

• The lit splint goes out

• The lit splint burns brighter

• The lit splint changes color

What is the purpose of using a lit splint in the experiment?

• To heat the copper(II) carbonate

• To test for the presence of carbon dioxide

• To stir the mixture

• To measure the temperature

What type of reaction is the decomposition of copper(II) carbonate?

• Double replacement reaction

• Single replacement reaction

• Decomposition reaction

• Synthesis reaction

What happens to the copper(II) carbonate as it decomposes?

• It begins to bubble

• It changes color

• It forms a liquid

• It emits light

What is observed when copper gets on the wooden splint?

• The flame turns yellow

• The flame turns red

• The flame turns green

• The flame turns blue

Why does the flame turn green during the experiment?

• Due to the presence of oxygen

• Due to the presence of copper

• Due to the presence of nitrogen

• Due to the presence of carbon dioxide

What is the role of heat in the decomposition reaction?

• To combine molecules

• To break down larger molecules into smaller ones

• To change the color of the reactants

• To cool down the reaction

What is the significance of the bubbling observed during the reaction?

• It indicates the absorption of heat

• It indicates the release of a gas

• It indicates the formation of a solid

• It indicates the presence of water