"Properties of Oxygen" Mystery of Air PPT Courseware

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"Properties of Oxygen" Mystery of Air PPT Courseware

[Introduction of new courses]

[Thinking] What is collected in the gas collecting bottle is a common gas. Do you know if it is air, oxygen or nitrogen?

If you want to verify that it is indeed oxygen, you must first understand the properties of oxygen.

Oxygen test

(1) Oxygen can rekindle wood sticks with sparks. (That is, oxygen can support combustion)

This experiment can be used to test the presence of oxygen: insert a wooden stick with sparks into the gas collecting bottle. If the wooden stick re-ignites, it proves that the bottle contains oxygen.

Discussion: There are four bottles of colorless gases on the table, namely oxygen, air, nitrogen, and carbon dioxide. How to distinguish them?

1. Properties of Oxygen

1. Physical properties of oxygen

(1) Colorless, odorless gas

(2) Denser than air

(3) Not easily soluble in water

Change conditions:

Oxygen → liquid oxygen → solid oxygen

(colorless) (light blue) (light blue)

chemical properties of oxygen

(1) Reaction of candles with oxygen

Candles burning in the air

[Phenomena] Release heat and produce a yellow flame, divided into three layers (outer flame, inner flame, flame core), with a small amount of black smoke.

candle burning in oxygen

[Phenomena] Burn violently, release heat, the flame color is white (white light is emitted), and white mist is produced, but no black smoke is produced.

(2) Reaction of carbon and oxygen

Carbon burns in the air

[Phenomena] 1. Redness 2. Heat release

Carbon burns in oxygen

[Phenomena] 1. White light 2. Heat release 3. The generated gas can turn clear lime water into turbidity

carbon + oxygen → carbon dioxide

Determine whether the following reaction is a combination reaction or an oxidation reaction

Sulfur + oxygen → sulfur dioxide

Zinc + hydrochloric acid → zinc chloride + hydrogen

Paraffin + oxygen → carbon dioxide + water

Magnesium + oxygen → magnesium oxide

Discussion: Under what circumstances is a reaction both a combination reaction and an oxidation reaction?

【summary】

chemical properties of oxygen

Oxygen is a gas with relatively active chemical properties. It has oxidizing properties, can support combustion, and can react with many substances. The higher the oxygen content, the more intense the combustion.

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Update Time: 2024-10-19

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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