Displacement Reactions in Chemistry

The video tutorial explains displacement reactions, where a more reactive element displaces a less reactive element from its compound. Examples include iron displacing copper in copper sulfate, zinc displacing copper in copper sulfate, and lead displacing copper in copper chloride. The tutorial emphasizes the concept of reactivity and provides chemical equations to illustrate these reactions.

What is a displacement reaction?

• A reaction where elements combine to form a compound.

• A reaction where a more reactive element replaces a less reactive one in a compound.

• A reaction where compounds decompose into simpler substances.

• A reaction where energy is absorbed from the surroundings.

In the reaction between iron and copper sulfate, what happens to the iron nail?

• It dissolves completely.

• It turns blue.

• It becomes brownish.

• It remains unchanged.

What is the product formed when iron displaces copper from copper sulfate?

• Iron chloride

• Iron sulfate

• Copper chloride

• Copper oxide

What happens to the color of copper sulfate solution when iron is added?

• It fades.

• It becomes more blue.

• It turns green.

• It turns red.

Which element displaces copper in a copper sulfate solution when zinc is added?

• Iron

• Zinc

• Lead

• Silver

What is formed when lead is added to copper chloride solution?

• Lead sulfate

• Lead chloride

• Copper sulfate

• Copper oxide

What is the chemical equation for the reaction between lead and copper chloride?

• Pb + CuCl2 → PbCl2 + Cu

• Pb + Cu → PbCu

• Pb + CuSO4 → PbSO4 + Cu

• Pb + CuO → PbO + Cu

In a displacement reaction, which type of element replaces another?

• Elements of the same reactivity replace each other

• Less reactive replaces more reactive

• Non-reactive elements replace reactive ones

• More reactive replaces less reactive

Which of the following is NOT a displacement reaction?

• Copper replacing zinc in zinc sulfate

• Iron replacing copper in copper sulfate

• Zinc replacing copper in copper sulfate

• Lead replacing copper in copper chloride

Which statement best summarizes a displacement reaction?

• Energy is released in the form of heat.

• A compound is broken down into simpler substances.

• An element is replaced by a more reactive element in a compound.

• A compound is formed by combining two elements.