| Category | Format | Size |
|---|---|---|
| People's Education Press Ninth Grade Chemistry Volume 1 | pptx | 6 MB |
"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 4
Description
"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 4
1. Review
what is chemistry
Chemistry is the science that studies the composition, structure, properties and changes of substances.
Can you observe experiments?
before change
Observe the color and state of the reactants. During the reaction, observe the conditions required for the reaction to occur (whether heating or other additional conditions are required).
When changing
The phenomenon that occurs (whether there is precipitation, gas generation, whether there is light, heat or color change, etc.).
after change
Observe the color and state of the product.
Think about it:
1. What do Experiment 1 and Experiment 2 have in common?
No new matter is produced;
2. What do Experiment 3 and Experiment 4 have in common?
New substances are generated;
3. What are the essential differences between Experiments 1 and 2 and Experiments 3 and 4?
2. Topic 1 - Changes and Properties of Matter
(1) Changes in matter
1. Physical changes: changes that do not produce other substances.
Boiling of water; grinding blue lumps of gall alum into powder; volatilization of gasoline and alcohol; casting molten iron into a pot; candles melting when heated
2. Chemical changes: changes that produce other substances.
Firewood burns; iron rusts; adding hydrochloric acid to limestone produces gas.
chemical changes and physical changes
⑴Definition: a change that does not produce other substances
⑵Characteristics: The form of matter has changed
⑶Form: fragmentation, diffusion, evaporation, solidification
⑷Judgment method: If no other substances are generated during the change process, but the form of the substance changes, then the change is a physical change.
(2) Nature of matter
1. Physical properties
Properties that do not require chemical changes
Color, state, odor, melting and boiling point, hardness, density, solubility...
2. Chemical properties
properties of matter in chemical changes
Flammability, steel rusts easily, oxygen can support combustion...
4. Consolidation practice—distinguish one by one
Which of the following are physical changes? What are chemical changes? What are physical properties? What are chemical properties?
A. Patina will decompose when heated;
B. Pure water is a colorless and odorless liquid;
C. Charcoal burns in the air to produce carbon dioxide;
D. Oxygen is not easily soluble in water and is denser than air;
E. The wooden stick broke due to force.
Consolidation exercises
Page P10 After-class exercises
1. Whether other substances are generated during the change.
2. Physical changes include: (1), (4), (6), (7), (8)
Because no new matter is produced during change.
Chemical changes include: (2), (3), (5);
Because new substances are generated when changes occur
3. Answer: When a candle is lit, the paraffin wax is heated and melted, which is a physical change, while the burning of the candle is a chemical change.
4. Physical properties include: (1), (2), (5), (8) because it is a property that does not require chemical changes to occur.
Chemical properties include: (3), (4), (6), (7) because it is a property expressed through chemical changes.
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For more information about the PPT courseware "Enter the Changes and Properties of Matter in the World of Chemistry", please click the "Entering the World of Chemistry ppt Changes and Properties of Matter ppt" tag.
"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 8:
"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 8 [Experiment 1-1] Operation: 1. Clamp the test tube containing a small amount of water diagonally on the iron stand. 2. Carefully heat the water at the bottom of the test tube until it boils. 3. Move a clean glass piece close to the test tube mouth. 【Experiment 1-2..
"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 7:
"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 7 1. Chemical Changes and Physical Changes Can you observe experiments? Before change: Observe the color and state of the reactants, and the conditions required for the reaction to occur (whether heating or other conditions are required). When changing: occurs..
"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 6:
"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 6 What is Chemistry? Chemistry is a natural science that studies the composition, structure, properties and changes of substances. The world is material, and matter moves and changes. How does matter change?
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Update Time: 2024-06-30
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