"Oxygen" Air and Water PPT Courseware 2

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"Oxygen" Air and Water PPT Courseware 2

1. Physical properties of oxygen:

Read the first paragraph on page 34 of the textbook and fill in the blanks below:

Oxygen is a ___ color___ smell___ substance, its density is _____ than that of air, ____ dissolves in water, becomes __________ at -183°C, and becomes __________ at -218 ___________, this change is a _______ change.

physical properties of oxygen

Generally refers to color, state, smell, melting point, boiling point, hardness and density, whether it is soluble in water, etc.

1. Color, state and taste: Under normal circumstances, it is a colorless and odorless gas.

2. Density: The density is slightly higher than that of air (under standard conditions)

3. Water solubility: not easily soluble in water

4. Three-state changes:

2. Chemical Properties of Oxygen

Generally refers to the flammability, combustion-supporting property, oxidizing property, reducing property, corrosiveness, toxicity, etc. of the substance.

Oxygen can rekindle wooden sticks with sparks, indicating that oxygen can support combustion (it has combustion-supporting properties).

Note: Oxygen itself cannot burn

chemical properties of oxygen

(1) Supply breathing: diving, medical first aid

(2) Combustion-supporting property (or supporting combustion)

Notice

1. Why is the wire coiled into a spiral?

Increase the heating area of ​​the wire

2. What is the role of matches in this experiment?

ignition wire

3. Why is the match inserted into the bottle when it is almost burned out?

Prevent matches from consuming too much oxygen when burning

4. Why should the bottom of the gas collecting bottle be covered with fine sand or water?

Prevent the high-temperature molten material from splashing and exploding the bottom of the bottle during the reaction

Chemical properties of oxygen (supports combustion)

1. Phosphorus combustion: phosphorus + oxygen → phosphorus pentoxide

2. Charcoal combustion: charcoal + oxygen → carbon dioxide

3. Sulfur combustion: sulfur + oxygen → sulfur dioxide

4. Iron wire combustion: iron + oxygen → ferric oxide

5. Magnesium strip combustion: magnesium + oxygen → magnesium oxide

3. Combination reaction

1. Combination reaction: a reaction in which two or more substances produce another substance.

2. Oxidation reaction: the reaction between a substance and oxygen. Oxygen provides oxygen in the reaction, it has oxidizing properties and is a common oxidizing agent.

Violent oxidation

Combustion, etc., the reaction is violent, combustion emits light and heat, the reaction is fast, and it is easy to observe

Slow oxidation

Reactions that take place very slowly and are not even noticeable (they also produce heat), such as respiration, food spoilage, wine and vinegar brewing, and the decomposition of farmyard manure.

On-site inspection:

1. The correct description of the experimental phenomenon is ( )

A. Carbon burns in oxygen and emits white light.

B. Phosphorus burns in the air to produce a lot of smoke

C. Iron wire burns in oxygen to form ferric oxide.

D. Sulfur burns in oxygen and emits a light blue flame

2. Which of the following does not belong to slow oxidation ( )

A. Metal corrosion B. Food spoilage

C. Evaporation of sprinkled essence D. Breathing of animals and plants

3. Which statement about oxygen is wrong ( )

A. Oxygen is a colorless and odorless gas

B． Oxygen is a gas that helps

C. Both liquid oxygen and solid oxygen are light blue

D． Oxygen is easily soluble in water

4. In order to make the bulb durable, protective gas can be filled into the bulb. The following gases that cannot be used as protective gas are ( )

A. Nitrogen b. Helium c. Neon D. oxygen

5. The following substances are burned in a gas bottle filled with oxygen. A small amount of water or fine sand should be placed at the bottom of the gas bottle: ( )

A. Charcoal B. Sulfur powder C. Iron wire D. Red phosphorus

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For more information about the "Air and Water Oxygen" PPT courseware, please click the Air and Water ppt Oxygen ppt tag.

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Update Time: 2024-10-04

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

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