Question 1: Define a displacement reaction in the context of metals.

Answer: A displacement reaction occurs when a more reactive metal displaces a less reactive metal from its compound in a solution.

Question 2: Explain why some metals can displace others from their compounds while some cannot.

Answer: Metals can displace others based on their reactivity; more reactive metals have a greater tendency to lose electrons and displace less reactive metals from their compounds.

Question 3: Describe the general mechanism of a displacement reaction involving zinc and copper sulfate.

Answer: Zinc, being more reactive, displaces copper from copper sulfate solution, forming zinc sulfate and copper metal as a precipitate.

Question 1: If 25 grams of zinc displaces 63 grams of copper from copper sulfate solution, what is the total mass of the solution after the reaction? (Assuming no other mass loss).

Answer: 88 grams

Question 2: Calculate the number of moles of zinc used if 25 grams are involved. (Atomic mass of Zinc = 65.38 g/mol).

Answer: 0.383 moles

Question 1: Describe a safe procedure to test which metals are more reactive using displacement reactions.

Answer: Place different metals in solutions of metal salts and observe if a new metal precipitate forms, ensuring safety precautions like wearing gloves and goggles are followed.

Question 2: List two variables that should be controlled during a displacement reaction experiment.

Answer: Concentration of solutions and temperature.

Question 1: In an experiment, zinc displaces copper from copper sulfate solution, producing a reddish-brown deposit. What does the color change indicate about the reaction?

Answer: The reddish-brown deposit indicates the formation of copper metal, confirming zinc's displacement of copper due to its higher reactivity.

Question 1: Describe the reactivity series of metals and explain how it helps predict displacement reactions. (6 marks)

Answer: The reactivity series is a list of metals arranged from most reactive to least reactive. It helps predict displacement reactions because a metal higher in the series can displace any metal below it from its compound, based on their positions in the series.

Question 1: Explain how displacement reactions are used in corrosion prevention or metal extraction industries.

Answer: Displacement reactions are used in galvanization to prevent rusting, where a protective zinc coating displaces iron rust, and in metal extraction, where more reactive metals displace less reactive ones from their ores.