"Clean Fuel—Hydrogen" Fuel PPT Courseware

Description

"Clean Fuel—Hydrogen" Fuel PPT Courseware

1. Physical properties of hydrogen

____Color____Taste____The most ____ gas that dissolves in water.

Under normal circumstances, hydrogen is in the ____ state, with a pressure of 101.3kPa and a temperature of -252°C. At C, it is in the ____ state; the temperature is -259. C, it becomes a ____-like ____ state; its melting and boiling points are ____ higher than those of all other common gases.

think

When we were children, we often asked adults to buy balloons, but if we accidentally let go of our fingers, the balloons would fly into the sky. Using what you have learned about the properties of the following gases and the data provided in the table below, analyze that the gas that can be used to fill the balloon is _____, and the reason is ____________.

2. Chemical properties of hydrogen

It is a gas that can burn, that is, it has _____ properties.

Chemical equation: 2H2+O2==2H2O

The product is _____, so hydrogen fuel is a clean fuel that does not produce pollution.

_____ is released during chemical changes, that is, chemical changes are accompanied by _____ changes.

Discussion: Why does pure hydrogen burn quietly in the air, but impure hydrogen explodes when ignited?

Start to open the small hole on the hydrogen storage cylinder, and the hydrogen gas escapes from the small hole. After igniting, it burns quietly and generates a lot of heat. As the hydrogen burns, the amount of hydrogen decreases and air enters the bottle. When the ratio of hydrogen to air reaches a certain ratio, the hydrogen and oxygen in the bottle react rapidly, generating a large amount of heat in a very short time. The gas in the plastic bottle expands rapidly, resulting in an explosion.

think

When impure hydrogen is ignited, there is a risk of explosion. So what do we need to pay attention to before using impure hydrogen?

Class summary

Learning target detection

Understand the physical properties of hydrogen gas

Understand the chemical properties of hydrogen gas

Know why hydrogen must be tested for purity before igniting

Learn how to test hydrogen purity

Know that hydrogen is an ideal high-energy fuel

Exercise 1

When large shopping malls hold celebrations, they often use large balloons flying high in the sky to enhance the atmosphere.

Now use what you have learned about the properties of the following gases and the data provided in the table below to analyze that the best gas to use for filling the balloon is _________. The reason is __________.

Exercise 2:

Two students were doing a hydrogen gas purity test.

Student A used a small test tube to collect hydrogen and moved the mouth of the tube downward toward the flame of the alcohol lamp. He heard a sharp popping sound. He immediately used the same test tube to collect hydrogen without any operation and prepared to test the purity again;

Student B moved the mouth of the test tube in which the hydrogen gas was collected upward toward the flame of the alcohol lamp. If he heard no popping sound, he judged that the hydrogen gas was pure.

Did the two students do it correctly? Why?

think:

The ideal way to produce hydrogen?

Use solar energy (or a catalyst) to split water to produce hydrogen.

What is the significance of new energy development and utilization?

Can reduce pollution;

Solving the problem of fossil fuel depletion

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For more information about the PPT courseware "Hydrogen as a Clean Fuel", please click the "Hydrogen as a Fuel Clean Fuel ppt" tag.

"Clean Fuel - Hydrogen" Fuel PPT Courseware 2:

"Clean Fuel Hydrogen" Fuel PPT Courseware 2 Learning Objectives: 1. Understand the physical properties of hydrogen. Know that hydrogen is the lightest gas in the material world. 2. Understand the flammability of hydrogen and its combustion products. Know that hydrogen must be pure before igniting it. 3. Learn how to test hydrogen..

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Update Time: 2024-11-26

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

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