Structural Questions



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Structural Questions:
Question 1. Displacement Reactions
Predict and explain briefly which of the following combinations does displacement reaction occur? For the ones do, write down what you expect to observe and the chemical equations.


  1. Copper wire immersed in silver nitrate solution

  2. Iron nail immersed in silver nitrate solution

  3. Iron nail immersed in copper sulfate solution

  4. Silver wire immersed in copper sulfate solution

  5. Graphite powder in silver nitrate solution

Question 2. Reactions of Metals and Their Compounds


List in the table below is the information for the reactions of metals D, E, F, G and their compounds.


Metals

Reactions of the metals and their compounds

D


Oxide of D under heating  Silvery liquid + gas Q

E

E + water  no reaction

F

F + water  hydroxide of F + gas R (vigorous reaction)

G

G + water  hydroxide of G + gas R (slow reaction)

G + dil. HCl(aq.) compound of G + gas R (fast reaction)

Oxide of G under heating  no reaction


Answer the following questions according to the information in the above table.




    1. Arrange E, F and G in decreasing order of reactivity. Explain your answer.

    2. What is gas R? How do you test it?

    3. Which of D and E is more reactive? Explain your answer.

    4. What is gas Q? How do you test it?

    5. Can you tell which of D and E is more reactive? If yes, state and explain your answer. If no, what experiment(s) would you do to obtain the answer?

    6. From the decomposition product of oxide of D, state what D is.

    7. After G reacts with water, a milky suspension is obtained. Why?

    8. What is the “compound of G” obtained in the reaction between G and dil. HCl(aq.)?

Question 3. Protection of Metals From Corrosion




    1. When a freshly prepared aluminium object is exposed to air, an oxide layer is formed. Write down the chemical formula for the layer and the equation for its formation.

    2. The oxide layer can protect the object from further reaction between the object and air. Therefore, we sometimes deliberately thicken this layer for stronger protection. What is the name of this thickening process? Draw a schematic diagram for carrying out this process.

    3. Rust is formed on the surface of an iron object when it is exposed to humid air. Write down the chemical formula for rust and the equation for its formation.

    4. Unlike the oxide layer formed on aluminium, rust cannot protect iron from further corrosion. Why?

    5. Anti-corrosion of iron can be done by suitable treatment with zinc. What is the name of the product formed? Briefly describe how it is obtained.


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