Reactivity series：練習題

Which of the following metals is the most reactive based on its position in the reactivity series?

The results of experiments involving four metals, W, X, Y, and Z, are summarized below:
- Metal X reacts vigorously with cold water.
- Metal W reacts with steam but not cold water.
- Metal Z reacts with dilute hydrochloric acid but not steam.
- Metal Y does not react with dilute hydrochloric acid.

What is the correct order of reactivity for these metals, from most reactive to least reactive?

Many metal oxides can be reduced by heating them with carbon.
Which metal oxide is the most difficult to reduce using this method?

Which list shows the metals in order of decreasing reactivity?

A mixture of copper(II) oxide and metal \( X \) is heated. A displacement reaction occurs, forming copper metal and an oxide of \( X \).
Which of the following could be metal \( X \)?

State what is observed when a piece of zinc is added to aqueous copper(II) sulfate and explain why this reaction occurs in terms of reactivity.

Explain the apparent unreactivity of aluminium in terms of its oxide layer and why this property makes it suitable for use in the manufacture of food containers.

The alkali metals in Group I of the Periodic Table are known for their high reactivity.
(a) Describe three observations you would make when a small piece of sodium is placed in a large trough of cold water.
(b) Write a balanced symbol equation, including state symbols, for the reaction between sodium and water.

A student used the results in the table below to determine the reactivity of four metals: P, Q, R, and S.

Reaction with cold water:
P: Vigorous fizzing, metal disappears.
Q: No reaction.
R: No reaction.
S: Very slow fizzing.

Reaction with dilute HCl:
Q: No reaction.
R: Steady fizzing.

(a) Arrange the four metals in order of decreasing reactivity.
(b) Predict whether metal R will react with an aqueous solution of metal Q ions. Justify your answer.
(c) Write an ionic half-equation for the oxidation of a metal atom M to a M\(^{2+}\) ion.