"Material Changes and Us" Material Changes PPT Courseware 3

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"Material Changes and Us" Material Changes PPT Courseware 3

We know that materials in nature undergo various changes. Can you give examples of material changes in life?

We already know that the materials around us are always undergoing various changes, such as: the rise and fall of the sun, the waxing and waning of the moon, the division, growth and differentiation of cells, the solubility of substances, rain, wood burning, plants Photosynthesis, waterfalls falling, electric lights glowing, icebergs melting, water electrolysis...

think:

What is a chemical change? What is a physical change?

Physical change: No new matter is produced during change, only changes in form and state.

Chemical changes: Changes that create new substances.

What are the connections and differences between physical changes and chemical changes?

1. The fundamental difference between the two: is there any new material generated during the change?

2. The connection between the two:

Chemical changes must be accompanied by physical changes

Physical changes do not necessarily involve chemical changes

1. Fill in the blanks.

1. Turn on the light switch, and the light will glow and heat, which is a ______ change.

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

3. When plants perform photosynthesis, they produce fresh oxygen, which is a _____ change.

4. Put the starch into the water and stir. Finally, the starch will precipitate, which is a _____ change.

5. When carbon dioxide gas is blown into the clear lime water, a white precipitate will appear, which is a ______ change.

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

7. When the balloon is inflated and let go, the air will flow out of the balloon, which is a ____ change.

choose

1. Which of the following changes does not produce new substances ( ).

A. Setting off fireworks B. Burning wood C. Salt dissolving in water D. Burning coal to generate electricity

2. Which of the following changes is a chemical change ( )

A. Melt iron and make a pot. B. Electrify water to obtain hydrogen and oxygen.

C. The length of the mercury inside the thermometer changes. D. The light is reflected back by the mirror.

3. Which of the following changes is a physical change ( ).

A. Gunpowder explosion B. Wood burning C. Wet clothes drying in the sun

judge

1. Material changes are everywhere and are closely related to our lives. ( )

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

3. The process of producing cement involves a series of complex physical and chemical changes. ( )

4. Gunpowder is one of the four great inventions in ancient my country. ( )

Make drinks

orange juice drink

Squeeze the juice from a peeled orange, add a small amount of water, and make an orange juice drink. It tastes pretty good, but a little sour. If you add a spoonful of sugar, it will taste better than orange juice bought in the store!

lemonade

In a glass of water, add two spoons of sugar, a small amount of citric acid, and a small spoonful of baking soda. The resulting drink will bubble. This is lemon soda.

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For more information about the PPT courseware "Changes of Matter, Changes of Matter and Us", please click the "Changes of Matter ppt, Changes of Matter and Us" ppt tag.

"Material Changes and Us" Material Changes PPT download:

"Material Changes and Us" Material Changes PPT Download Part One: Import the new lesson and 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...

"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...

"Material Changes and Us" Material Changes PPT Courseware 4:

"Material Changes and Us" Material Changes PPT Courseware 4 Material: The actual things that we can observe directly or indirectly. The world around us is made of matter. Matter will change. Changes in matter. Changes in matter can generally be divided into physical Change and...

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Update Time: 2024-10-01

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

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