Chemical Reactions with Copper Sulphate

The video tutorial explains the concept of single displacement reactions, focusing on the differences between physical and chemical changes. It describes an experiment involving an iron nail and copper sulphate solution to demonstrate a chemical change. The procedure, observations, and results are detailed, highlighting the formation of ferrous sulphate and the deposition of copper. Safety precautions for handling chemicals are also discussed.

What is a physical change?

• A change that creates a new substance.

• A change in the appearance or physical properties of a substance without forming a new substance.

• A change that involves the formation of gas.

• A change that involves a color change.

Which of the following is an example of a chemical change?

• Burning of paper

• Freezing of water

• Boiling of water

• Melting of ice-cream

What is the aim of the experiment involving iron nails and copper sulphate solution?

• To classify the reaction as a physical or chemical change.

• To measure the density of iron nails.

• To observe the boiling point of the solution.

• To determine the melting point of copper sulphate.

Which material is NOT required for the experiment?

• Bunsen burner

• Boiling tubes

• Iron nails

• Copper sulphate solution

What is the first step in the procedure of the experiment?

• Pour copper sulphate solution into boiling tubes.

• Tie an iron nail with a thread and hang it in a boiling tube.

• Fix test tubes in stands with clamps.

• Remove the iron nail after a day.

What indicates that a chemical change has occurred in the experiment?

• The iron nail dissolves completely.

• The solution changes from blue to green.

• The iron nail becomes shiny.

• The solution remains blue.

What is the new compound formed in the reaction between iron and copper sulphate?

• CuO

• Fe2O3

• FeSO4

• CuSO4

What is deposited on the iron nail during the experiment?

• Oxygen

• Iron

• Copper

• Sulphur

Why is it recommended to wear gloves during the experiment?

• To improve grip on the materials.

• To prevent the solution from evaporating.

• To avoid touching the copper sulphate solution.

• To keep the hands warm.

What should be avoided while handling the copper sulphate solution?

• Shaking the solution

• Touching the solution

• Heating the solution

• Mixing with other chemicals