"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 7

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"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: 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.

Experiment 1: Boiling of water

(1) Clamp the test tube containing a small amount of water diagonally on the iron stand, as shown in the figure.

(2) Carefully heat the water at the bottom of the test tube until it boils.

(3) Move a clean watch glass close to the test tube mouth and observe the phenomenon.

Experiment 2: Grinding of bile alum

(1) Take a small amount of gall alum and put it in a mortar.

(2) Grind the bile alum with a pestle and observe the phenomenon.

Experiment 3: Reaction of bile alum and sodium hydroxide

(1) Take a small amount of ground bile alum and put it into two test tubes respectively.

(2) Add a small amount of water to it and shake until it becomes a clear solution.

(3) Drop sodium hydroxide solution into one of the test tubes and observe the changes in the test tube.

1. Physical changes

(1). Definition: a change that does not produce other substances

(2). Phenomenon: changes in material state, shape, and size

(3). Examples: ore crushing, three-state change, balloon explosion, light bulb glow, alcohol volatilization, etc.

2. Chemical changes

(1). Definition: Changes that produce other substances

(2). Essential characteristics: produced by other substances

(3). Phenomenon: color change, gas release, precipitation, accompanied by energy changes: endothermic, exothermic, luminous, etc.

(4). Examples: food rot, metal rust, burning, gunpowder explosion, etc.

(Food rotting, metal rusting, and burning must be chemical changes.)

2. Physical and chemical properties

1. Physical properties:

A property that does not require ________ to occur.

Such as: color, state, odor, density, hardness, melting point, boiling point, electrical conductivity, thermal conductivity, ductility, volatility, solubility, adsorption, ferromagnetism, etc.

2. Chemical properties:

The properties of matter manifested in ________.

Such as: flammability, combustion-supporting property, oxidizing property, reducing property, toxicity, metal activity, acidity and alkalinity, easy decomposition by heat, etc.

Self-diagnosis test questions

1. The main basis for judging that burning charcoal in air is a chemical change is ( )

A. Produce red light B. Release a lot of heat

C. The colorless gas carbon dioxide is produced. D. The charcoal disappears.

2. Which of the following changes are physical changes ( )

A. Gunpowder explosion B. Coal combustion

C. Ore crushing D. Steel rusting

3. Which of the following phenomena is a chemical change ( )

A. Ice melts into water B. Steel rusts

C. Steel ingots are rolled into steel bars D. Candles are melted

4. Among the following four changes, one is essentially different from the other three, it is ()

A. Rusting of iron B. Vaporization of water C. Burning of coal D. Fatty acid deterioration

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"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 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?

"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 5:

"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 5 1. Chemical changes and physical changes 1. Physical changes ⑴ Definition: changes that do not generate other substances ⑵ Characteristics: no generation of new substances ⑶ Accompanying phenomena: often manifested as forms or change of status 2..

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Update Time: 2024-11-14

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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