"Air and Oxygen" PPT

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"Air and Oxygen" PPT

Part One: Properties of Oxygen

1. Observe the color and status 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.

The correct way to smell is:

Gently stir the mouth of the bottle with your hand to allow a very small amount of gas to float into your nostrils. Do not put your nostrils directly to the mouth of the bottle to smell the gas (why)

Think: Do you think oxygen can dissolve in water? Are there any examples to support your point of view?

Think about it: Can you still design a simple experiment to prove the solubility of oxygen?

The following instruments are provided to you: sink, water, bottle of oxygen, matches

There is water at the bottom of the oxygen bottle, but it can also make the wooden sticks with sparks burn more vigorously, which shows that oxygen has little dissolving ability in water. (Not easily soluble in water, 30ml/L)

Air and Oxygen PPT, Part 2: Classroom Experiment

Experiment 1 Sulfur burns in oxygen

1. Sulfur is a ____-colored solid powder

2. Sulfur burns in the air and emits ___________ colored flames

3. Sulfur burns in pure oxygen and emits a ____________ colored flame. After the reaction, a sulfur dioxide with a ___________ smell (chemical formula is _______) is generated. The outer wall of the gas collecting bottle feels _______ when touched by hand, indicating that sulfur burning energy _______hot.

4. This change is a _____ change, because the substances participating in the reaction are ____ and ______, and the substance generated after the reaction is _______

5. How to express the above change process using text expressions?

Experiment 2: Iron wire burns in oxygen

1. Iron is a ________-colored metal

2. Iron wire ______________ releases ____ in pure oxygen to produce a ___ color solid ferric oxide (chemical formula is _____).

3. Think about it: Why do you need to put some water or fine sand at the bottom of the gas collecting bottle?

Prevent the generated melt from splashing and exploding the bottom of the bottle.

4. How to express the above change process using chemical expressions?

Air and Oxygen PPT, Part 3: Think About It

The phenomenon of charcoal burning in oxygen:

Charcoal burns more vigorously in oxygen, emits white light, releases heat, and generates a gas that turns clear lime water turbid.

The phenomenon of red phosphorus burning in oxygen:

Red phosphorus burns in oxygen and emits white light, white smoke, and heat.

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, air and oxygen PPT download, .PPT format;

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

"Air and Oxygen" PPT download:

"Air and Oxygen" PPT Download Part One: Preparing Oxygen in the Laboratory 1. Steps to produce oxygen using hydrogen peroxide (hydrogen peroxide): 1. Check the air tightness of the device; 2. Add MnO2 to the flask; 3. Connect the device; 4. Add H2O2 to the separatory funnel; 5..

"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..

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Update Time: 2024-10-06

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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