"Properties of Oxygen" Mystery of Air PPT Courseware 2

Description

"Properties of Oxygen" Mystery of Air PPT Courseware 2

1. Physical properties

1. Color, taste and state:

A gas that is usually colorless and odorless

2. Density: slightly denser than air

3. Solubility: Not easily soluble in water

4. Three-state transformation: under 101kPa

2. Chemical properties

Refers to the properties manifested during chemical changes.

2. Chemical properties of oxygen

(1) Reaction of sulfur and oxygen (Experiment 2-3)

Procedure for observing sulfur combustion:

The color, state, and taste of the reaction substances, reaction conditions and operations, the color, state, taste, and accompanying phenomena of the substances produced by the reaction, and the inspection of special generated substances.

Sulfur burns in the air

【Phenomenon】

1. Produce a weak light blue flame

2. Release heat

3. Generate pungent smelling gas

Sulfur burns in oxygen

【Phenomenon】

1. Emit bright blue-purple flames

2. Release heat

3. Generate pungent smelling gas

Let’s communicate

(1) When doing this experiment, in order for the experiment to be successful, why was a matchstick tied to the wire? You also need to wind the wire into a spiral shape, why?

Ignite the wire. Increasing the contact area with oxygen accumulates heat and makes the wire easy to burn.

(2) Why put some water or spread a layer of fine sand at the bottom of the bottle before the experiment?

In order to prevent the molten material splashing from exploding the bottom of the bottle during burning.

4. Reaction with phosphorus

Phenomenon: A large amount of white smoke is produced, heat is released, and a white solid is produced.

in conclusion:

Red phosphorus + oxygen → phosphorus pentoxide

P + O2→P2O5

Note: P2O5 is a solid, not a gas

Do you know how?

1. Use line segments to connect the phenomena when the following substances burn:

Charcoal burns in oxygen and sparks fly

Sulfur burns in oxygen and emits a light blue flame

Thin wire burns in oxygen and emits white light

Sulfur burns in the air with a bright blue-violet flame

2. Write the text expression of the above reaction and write the chemical formula under the name of the substance.

carbon + oxygen → carbon dioxide

C O2 CO2

Sulfur + oxygen → sulfur dioxide

S O2 SO2

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Update Time: 2024-09-21

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

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