Question

Определи, какие из утверждений верны 1. Для разбавления кислот необходимо в сосуд с водой наливать кислоту. 2. Все металлы могут вступать в реакцию с Кислотами. 3. Качественной реакцией на водород является горящая лучинка.1 и 3Только 1 только 2​

Answer 1

Ответ:

1 и 3

Объяснение:

Answer 2

Verifying the Statements

1. *Для разбавления кислот необходимо в сосуд с водой наливать кислоту.* 2. *Все металлы могут вступать в реакцию с кислотами.* 3. *Качественной реакцией на водород является горящая лучинка.*

Let's verify each statement based on the search results.

Verifying Statement 1

The statement "Для разбавления кислот необходимо в сосуд с водой наливать кислоту" is incorrect. When diluting an acid, it is essential to add the acid to water, not the other way around. This is a safety precaution to prevent the acid from splashing or reacting violently.

The correct procedure is to add the acid to water slowly while stirring continuously. This helps to control the heat generated by the dilution process and prevents splashing or spattering.

Verifying Statement 2

The statement "Все металлы могут вступать в реакцию с кислотами" is also incorrect. Not all metals react with acids. Generally, only the more reactive metals, such as those in the reactivity series above hydrogen, will react with acids to produce salt and hydrogen gas.

Less reactive metals, such as copper and silver, do not react with most acids. Therefore, the statement that all metals can react with acids is not accurate.

Verifying Statement 3

The statement "Качественной реакцией на водород является горящая лучинка" is correct. The test for hydrogen gas involves holding a lit splint near the mouth of the test tube containing the gas. If the gas is hydrogen, it will ignite with a "pop" sound, and the splint will produce a squeaky pop or a small explosion.

This test is a qualitative method for identifying the presence of hydrogen gas and is commonly used in chemistry laboratories.

Based on the verified information, Statement 1 is incorrect, Statement 2 is incorrect, and Statement 3 is correct.