"Oxygen" The air around us PPT courseware 8

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"Oxygen" The air around us PPT courseware 8

1. Properties of Oxygen

1. Physical properties of oxygen

(1) Normally, colorless and odorless gas

(2) The density is slightly greater than that of air

(3) Not easily soluble in water

Oxygen test

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

Check oxygen:

Insert the wooden stick with sparks into the gas collecting bottle. If the wooden stick ignites again, it proves that the bottle contains oxygen.

chemical properties of oxygen

(1) Reaction of sulfur and oxygen

Sulfur burns in the air

[Phenomena] 1. Light blue flame 2. Heat release 3. Generation of pungent smelling gas

[Phenomena] 1. Blue-purple flame 2. Heat release 3. Generation of pungent smelling gas

(2) Reaction of carbon and oxygen

Carbon burns in the air

[Phenomena] 1. Redness 2. Heat release 3. Gas generation can turn clear lime water into turbidity

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

(3) Reaction of iron and oxygen

[Experimental Phenomenon] 1. Burn violently, with sparks shooting out 2. Release a lot of heat 3. Generate black solid

Prevent high-temperature products from splashing and exploding the bottom of the bottle

discuss:

1. Why is the wire coiled in a spiral shape?

Increase the heating area of ​​the wire,

Increase the heating area of ​​the wire

2. What is the purpose of tying a match to the lower end? Ignite the wire.

3. Why wait until the match is almost burned out before putting it into the bottle? Prevent matches from burning and consuming oxygen in the bottle.

2. Combination reactions and oxidation reactions

Combination reaction: A reaction in which two or more substances produce one substance.

Oxidation reaction: The reaction between a substance and oxygen.

Slow oxidation: Oxidation that proceeds very slowly and is not easily noticeable is called slow oxidation.

【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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"Air and Oxygen" PPT:

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Update Time: 2024-11-18

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

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