Question

Какими способами можно собирать кислород в пробирку? На каких свойствах кислород основаны эти способы?

Answer 1

получают кислород при разложении перманганата калия

2KMnO4=K2MnO4+MnO2+O2

Доказать его наличие в пробирке можно тлеющей лучинкой, в кислороде она вспыхивает.

Answer 2

Ways to Collect Oxygen in a Test Tube

There are several methods to collect oxygen in a test tube. These methods are based on the properties of oxygen and its behavior under certain conditions. Let's explore some of these methods:

1. Electrolysis of Water: Oxygen can be collected in a test tube by electrolyzing water. In this process, an electric current is passed through water, causing it to split into oxygen and hydrogen gas. The oxygen gas is then collected in the test tube. This method is based on the fact that oxygen is released at the anode during electrolysis.

2. Decomposition of Hydrogen Peroxide: Another method to collect oxygen in a test tube is by decomposing hydrogen peroxide. Hydrogen peroxide breaks down into water and oxygen gas when heated or catalyzed by a suitable catalyst, such as manganese dioxide. The oxygen gas is collected in the test tube. This method is based on the fact that hydrogen peroxide decomposes into oxygen and water.

3. Displacement of Air: Oxygen can also be collected in a test tube by displacing air. This method involves using a gas that reacts with oxygen, such as hydrogen or carbon monoxide, to displace the air in the test tube. The oxygen gas is then collected as it is released during the displacement reaction. This method is based on the fact that oxygen is more reactive than the displacing gas.

4. Photosynthesis: Plants produce oxygen through the process of photosynthesis. By placing a photosynthesizing plant in a test tube filled with water and exposing it to light, oxygen gas is released as a byproduct of photosynthesis. The oxygen gas can be collected in the test tube. This method is based on the fact that plants produce oxygen during photosynthesis.

Properties of Oxygen Used in These Methods

The methods mentioned above for collecting oxygen in a test tube are based on certain properties of oxygen. Here are the properties on which these methods rely:

1. Reactivity: Oxygen is a highly reactive element. It readily combines with other elements and compounds, making it possible to displace air or react with hydrogen or carbon monoxide to collect oxygen in a test tube.

2. Electrolysis: Oxygen is released at the anode during the electrolysis of water. This property allows for the collection of oxygen gas by passing an electric current through water.

3. Decomposition: Oxygen is released when hydrogen peroxide decomposes. This property enables the collection of oxygen gas by decomposing hydrogen peroxide using heat or a suitable catalyst.

4. Photosynthesis: Oxygen is produced as a byproduct of photosynthesis in plants. This property allows for the collection of oxygen gas by exposing a photosynthesizing plant to light in a test tube filled with water.

These methods and properties provide a means to collect oxygen in a test tube for various scientific experiments and investigations.