"Changes of Matter" PPT courseware

Description

"Changes of Matter" PPT courseware

Part One: Questions and Thoughts

Question:

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, electrolysis of water.

What are the above changes?

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 changes in these examples just now?

The rise and fall of the sun, the waxing and waning of the moon, cell division, growth and differentiation, the solubility of substances, rain, wood burning, plant photosynthesis, waterfalls falling, electric lights glowing, icebergs melting, water electrolysis.

Changes in matter PPT, part 2 content: physical changes and chemical changes

What are the differences in nature between physical changes and chemical changes?

The essence of physical change: the distance between molecules changes.

The essence of chemical change: the atoms that make up the molecules of a substance are recombined to form new molecules.

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

1. The fundamental difference between the two:

Are there any new substances generated during the change?

2. The connection between the two:

Chemical changes must be accompanied by physical changes

Physical changes are not necessarily accompanied by chemical changes

Changes in matter PPT, part 3 content: exercises:

1. Determine whether the following changes are physical changes or chemical changes

⑴ Grind the iron block into iron powder

⑵Put the iron block on the ground and it will rust.

⑶Put the wet clothes in the sun and dry them

⑷Pull copper ingots into copper wire

⑸Iron melts into molten iron at high temperature

⑹Burning of coal

⑺Ammonium bicarbonate decomposes into ammonia, water, and carbon dioxide when heated

2. Determine whether the following changes are physical changes or chemical changes

⑴Air liquefaction

⑵ Bronze becomes green and rusty

⑶Carbon dioxide turns clear limewater turbid

⑷Alcohol evaporates

⑸Gunpowder explosion

⑹The filament emits light and releases heat after being energized.

practise:

1. How to determine whether a substance has undergone chemical changes?

Whether new substances are produced after material changes.

2. Among the properties displayed by copper sulfate during the following changes, which are physical properties and which are chemical properties?

⑴Can be dissolved in water;

⑵ Add sodium hydroxide solution dropwise to the aqueous solution to produce precipitation;

⑶The crystals are blue.

Physical properties: ⑴, ⑶; Chemical properties: ⑵.

3. What methods can we use when exploring changes in matter?

Look for evidence of material changes, such as whether there is precipitation, gas production, shape changes, color changes, temperature changes, etc.

Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, change of matter PPT download, .PPT format;

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Update Time: 2024-09-30

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

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