"Oxygen" The air around us PPT courseware 2

Description

"Oxygen" The air around us PPT courseware 2

1. Properties of Oxygen

1. Physical properties of oxygen

(1) Colorless, odorless gas;

(2) Denser than air;

(3) Not easily soluble in water;

(4) Three-state change: oxygen → liquid oxygen → solid oxygen

(colorless) (light blue) (light blue)

2. Chemical properties of oxygen

(1) Support combustion: Oxygen can rekindle wood strips with sparks.

(2) Reaction of sulfur and oxygen:

①Sulfur burns in the air and emits _____ flame;

②Sulfur burns in oxygen to emit ______ flame;

③ Release heat;

④Generate gas with pungent odor;

discuss

[Discussion] How do charcoal and sulfur burn in air and in oxygen? This shows what?

When substances burn in the air, they mainly react with oxygen in the air. The severity of the reaction depends on the oxygen content. The higher the oxygen content, the more violent the combustion.

The difference between substances burning in air and oxygen

1 Some substances cannot burn in air, but they can burn in oxygen. Such as iron, aluminum, etc.

2 The intensity of burning is different. Substances burn less vigorously in air than in oxygen.

3 Some of the main phenomena are similar. For example, red phosphorus will produce a large amount of white smoke when burned in air and oxygen.

Summary of chemical properties of oxygen

[Summary] Oxygen is a chemically active gas that can support combustion and react with many substances.

practice

1. When the following substances burn in oxygen, a large amount of white smoke can be seen: ( )

A. Hydrogen B. Sulfur powder C. Red phosphorus D. Charcoal

2. Which of the following descriptions of experimental phenomena is incorrect ( )

A.Charcoal burns more violently in oxygen than in air

B. Charcoal burns in oxygen to produce carbon dioxide gas

C. When sulfur burns in oxygen, the flame is blue-purple and a pungent smelling gas is produced.

D. After the charcoal is burned, immediately pour clear lime water into the bottle, and it will become turbid after shaking.

3. Observe the operations and phenomena in the picture. The correct description is ( )

A. The gas in the gas collecting bottle may be CO2

B. The gas in the gas collecting bottle may be air

C. The gas in the gas collecting bottle must be O2

D. The gas in the gas collecting bottle must be N2

4. Which of the following statements about the properties of oxygen is incorrect ( )

A. Oxygen is a gas with relatively active chemical properties.

B. It can react chemically with all substances

C. In the oxidation reaction, heat is generally released

D. Oxygen can burn

What did you gain from studying this lesson?

(1) Properties of oxygen:

1. Physical properties: colorless, odorless, poorly soluble in water

2. Chemical properties:

It can support combustion; oxygen is a gas with relatively active chemical properties and can react with many substances; oxygen has oxidizing properties.

(2) Combination reaction: multiple changes

(3) Oxidation reaction: violent oxidation, slow oxidation

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Update Time: 2024-11-05

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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