The video tutorial explains displacement reactions, where an element replaces another in a compound. It provides a step-by-step guide to an experiment using iron nails and copper sulfate solution to demonstrate this reaction. The experiment involves immersing iron nails in copper sulfate solution and observing changes in color, indicating a chemical reaction. The tutorial concludes with a discussion of the results, highlighting the displacement of copper by iron, and presents the chemical equation for the reaction.

What is a displacement reaction?

• A reaction where two compounds exchange elements to form two new compounds.

• A reaction where a compound breaks down into two or more elements.

• A reaction where two elements combine to form a compound.

• A reaction where an element reacts with a compound and replaces another element in the compound.

In the general equation A + BC → AB + C, what do A and C represent?

• Ions

• Elements

• Mixtures

• Compounds

What is the first step in the activity involving iron nails and copper sulfate solution?

• Heat the copper sulfate solution.

• Add salt to the copper sulfate solution.

• Clean the iron nails by rubbing with sandpaper.

• Immerse the iron nails in water.

How long should the iron nails be immersed in the copper sulfate solution in test tube B?

• 25 minutes

• 10 minutes

• 15 minutes

• 20 minutes

What color change is observed in the iron nail after being dipped in the copper sulfate solution?

• The iron nail turns black.

• The iron nail turns brownish.

• The iron nail turns green.

• The iron nail turns blue.

What is the chemical reaction that occurs when iron displaces copper from copper sulfate solution?

• Fe + CuSO4 → FeCuSO4 + O2

• Fe + CuSO4 → FeSO4 + CuSO4

• Fe + CuSO4 → FeCu + SO4

• Fe + CuSO4 → FeSO4 + Cu