"Oxygen" air and water PPT courseware

Description

"Oxygen" air and water PPT courseware

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

【Phenomenon】

1. Light blue flame 2. Heat release 3. Generate pungent smelling gas

Sulfur burns in oxygen

【Phenomenon】

1. Blue-purple flame 2. Heat release 3. Generate pungent smelling gas

(2) Reaction of carbon and oxygen

Carbon burns in the air

【Phenomenon】

1. Redness 2. Heat release 3. The generated gas can turn clear lime water into turbidity

Carbon burns in oxygen

【Phenomenon】

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

(3) Reaction of iron and oxygen

【Experimental phenomena】

1. Burn violently, with sparks shooting out. 2. Release a lot of heat. 3. Produce black solids.

[Thinking] Why put some water or spread a layer of fine sand at the bottom of the bottle before the experiment?

discuss:

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

Increase the heating area of ​​the iron wire. Increase the heating area of ​​the iron 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.

Iron + oxygen → ferric oxide

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.

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

【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 download:

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"Air and Oxygen" PPT courseware:

"Air and Oxygen" PPT courseware Part 1: Composition of air 1. Prove that the air contains carbon dioxide: -----Air can make clear lime water turbid. 2. Proof that there is water vapor in the air: -----When ice is placed in a cup, water droplets appear on the wall of the cup. -----Anhydrous sulfur..

"Air and Oxygen" PPT:

"Air and Oxygen" PPT Part One: Properties of Oxygen 1. Observe the color and state of a bottle of oxygen. 2. Gently fan the mouth of the bottle with your hand to let a small amount of oxygen float into your nostrils and smell its smell. Oxygen is a ____color____odorous gas. Smell...

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Update Time: 2024-11-24

This template belongs to Chemistry courseware Hunan Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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