Question

с водой при комнатной температуре может реагировать каждый из 2х металлов:1. алюминий и ртуть2.кальций и литий3.натрий и серебро4.барий и медь

Answer 1

Ответ: 2 кальций и литий, т.к. эти металлы очень активные, в ряду активности металлов стоят до Мg

Answer 2

Правильный ответ 2.

Ca + 2H2O →  Ca(OH)2 + H2↑

2Li + 2H2O →  2LiOH + H2↑

Answer 3

Reactivity of Metals with Water at Room Temperature

At room temperature, not every metal reacts with water. Let's examine the reactivity of the given pairs of metals with water:

1. Aluminum and Mercury - Aluminum does react with water, but it has a protective oxide layer that prevents further reaction. Mercury, on the other hand, does not react with water at room temperature [[1]].

2. Calcium and Lithium - Calcium reacts vigorously with water at room temperature to form calcium hydroxide and hydrogen gas. Lithium also reacts with water, but its reaction is less vigorous compared to calcium [[2]].

3. Sodium and Silver - Sodium reacts vigorously with water, producing sodium hydroxide and hydrogen gas. Silver does not react with water at room temperature [[3]].

4. Barium and Copper - Barium reacts with water, but not at room temperature. It reacts with cold water to form barium hydroxide and hydrogen gas. Copper does not react with water at room temperature [[4]].

Based on the information from the search results, the correct pair of metals that can react with water at room temperature is Sodium and Silver.