"Material Changes and Us" Material Changes PPT Download

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"Material Changes and Us" Material Changes PPT Download

Part 1: Importing new lessons

Fill it out.

1. The world around us is made of _____, and matter changes.

2. Changes in matter are generally divided into two categories: ____________________.

3. There are many phenomena associated with chemical changes, and the most important feature is _______________.

4. During the chemical change of substances, _______________ must occur.

Material Changes and Us PPT, Part 2: Exploring New Knowledge

Material changes and our lives

1. Organize the material changes in this unit

2. Core concepts of this unit

(1) What are the connections and differences between physical changes and chemical changes?

(2) Matter changes.

The world around us is made of matter, and matter will change, but the speed of change is different and the phenomena are different.

What is the connection between material changes and us?

Therefore, it seems that material changes are closely related to our lives.

The hot summer is here. Making a homemade drink is a good way, which is healthy and free of additives and relieves the heat. Let’s try it together!

Make drinks

1. Make orange juice drink.

Materials: oranges, water, juicer, cup.

Preparation steps: Wash a peeled orange and cut it into small pieces and put it into a juicer. Add a small amount of water to the squeezed orange juice, stir and serve.

Production principle: The process of making orange juice is a physical change. We just mix orange juice and water, no new substances are produced.

Think about how to make lemonade?

2. Make lemonade

Materials: lemon, water, juicer, cup, baking soda, spoon, sugar.

Production steps:

(1) Put the lemon into the juicer and use a cup to collect the squeezed lemon juice.

(2) Add a small amount of sugar to the lemon juice and stir until the sugar is completely dissolved.

(3) Add a small spoonful of baking soda to the lemon juice and stir to make lemonade.

Production principle: During the process of making lemonade, bubbles will appear, and the gas generated is a new substance. This process is a chemical change.

Material Changes and Us PPT, Part 3: Expansion and Extension

The chemistry of fireworks

In the process of making fireworks, adding some luminescent agents and color-developing agents can make the fireworks emit colorful colors.

The luminescent agent is metal magnesium or metal aluminum powder. When these metals burn, they emit intense incandescent light.

Chromogens are actually nothing more than metal compounds. Metal compounds contain metal ions.

When these metal ions are burned, they emit a unique flame color. Different types of metal compounds emit different colors of light when burned.

The people who make the fireworks carefully arrange the fireworks and determine the order in which they are burned. In this way, after the fireworks are detonated, they can bloom into bright and colorful patterns in the dark sky.

Material Changes and Us PPT, Part 4 Content: Summary of this Lesson

1. Material changes are closely related to human production and life. All human production activities and human life make use of material changes.

2. Whether "new substances are produced" is a sign that distinguishes physical changes from chemical changes.

3. Physical changes must occur during the chemical changes of substances.

Material Changes and Us PPT, Part 5: Exercises for this Lesson

1. Judgment questions

1. Although material changes are everywhere, they are not closely related to our lives. ( )

2. Food must undergo many chemical changes before it can be converted into the nutrients our bodies need. ( )

3. Physical changes must occur during the chemical changes of substances. ( )

4. "Low-carbon life" means minimizing energy consumption in daily life, thereby reducing carbon dioxide emissions. ( )

2. Fill in the blanks

1. The world around us is made of _______, and matter undergoes ________.

2. Changes in matter are generally divided into two categories: ________ and ________.

3. Chemical changes are accompanied by many phenomena, the most important characteristic of which is the production of ________.

4. When charcoal burns, it emits light and heat at the same time, which is a _______ change.

5. When ink is dropped into clear water, the blackening of the clear water is a ______ change.

3. Short answer questions

1. What will be the consequences of the sharp increase in the consumption of fossil fuels such as coal and oil?

A large amount of carbon dioxide is produced, causing the carbon dioxide content in the air to continue to increase, leading to global climate warming, soil desertification, and the melting of continental and polar glaciers, putting tremendous pressure on the global environment.

2. Wood is widely used in our lives and can be made into furniture, paper, and fuel. When does a physical change occur and when does a chemical change occur?

When wood is processed into furniture, it only changes its form, and no new substance is produced, which is a physical change. What happens when wood is burned as fuel are chemical changes.

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"Material Changes and Us" Material Changes PPT:

"Material Changes and Us" Material Changes PPT Part One: Material Changes The world around us is made of matter, and matter will change. Changes in matter are generally divided into two categories: physical changes and chemical changes. Chemical changes are accompanied by many phenomena...

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Update Time: 2024-11-24

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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