"Oxygen" Air and Water PPT Courseware 3

Description

"Oxygen" Air and Water PPT Courseware 3

A wooden stick with sparks reaches into the oxygen

Phenomenon: Wood sticks with sparks rekindled

Explanation: Oxygen supports combustion

(After-class exercise 3) What simple method is used to test whether a bottle of colorless gas is oxygen?

Answer: Put the wooden stick with sparks into the gas collecting bottle. If the wooden stick with sparks re-ignites, it proves that the gas is oxygen.

burning of sulfur

The phenomenon of sulfur burning in the air

A weak light blue flame emits heat and generates a pungent smelling gas (SO2)

The phenomenon of sulfur burning in oxygen

Emits a blue-violet flame, releases heat, and generates a pungent smelling gas (SO2)

discuss

Wood sticks and sulfur burn differently in air and in oxygen. What does this mean?

Clear: This means that the greater the concentration of oxygen, the more vigorously the combustibles will burn.

burning of charcoal

Phenomenon:

1. Emit white light

2. Release heat

3. Burns more vigorously than burning in air

in conclusion:

carbon + oxygen → carbon dioxide

C + O2→CO2

think about it

What do the following three reactions have in common?

Sulfur + oxygen → sulfur dioxide

carbon + oxygen → carbon dioxide

Iron + oxygen → ferric oxide

1. It is the reaction of two (or more than two) substances to form another substance - compound reaction

2. They are all reactions between substances and oxygen - oxidation reactions

3. Oxygen provides oxygen in the oxidation reaction and has oxidizing properties.

Classification of oxidation reactions

Violent oxidation, violent reaction, luminescence and heat release

Such as: burning, explosion, etc.

Slow oxidation The reaction proceeds very slowly and is difficult to detect

Such as: the respiration of animals and plants, the decay of food, the brewing of wine and vinegar, the decomposition of farm fertilizers, etc.

Summary of this section

1. The chemical properties of oxygen are relatively active, it can support combustion, and it can undergo violent oxidation reactions with many substances at high temperatures.

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

Oxidation reaction: The reaction between a substance and oxygen.

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Update Time: 2024-11-21

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

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