"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 2

Description

"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 2

1. Observation experiment method:

Color, smell, state, etc. before change,

The main phenomena that occur when changing (such as light, heat, etc.),

The color, smell, state, etc. of the product after the change.

2. Physical changes and chemical changes

1. Physical changes: changes that do not produce other substances.

2. Chemical changes: changes that produce other substances when they change.

The basis for judging physical changes and chemical changes: whether other substances are generated.

The connection between physical changes and chemical changes: The process of chemical changes must be accompanied by physical changes, but the process of physical changes may not be accompanied by chemical changes.

test you

1. The characteristics of chemical changes are ( )

A. There is light and heat phenomenon

B. The state or color of a substance changes

C. Gas is released or precipitation occurs

D. Other substances are produced

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 changes are chemical changes ( )

A. Ice melts into water B. Steel rusts

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

3. Physical and chemical properties

1. Physical properties: Properties that a substance exhibits without chemical changes, such as color, odor, state, boiling point, hardness, density, solubility, etc.

2. Chemical properties: properties manifested by substances in chemical changes, such as flammability, stability, oxidability, etc.

What is the difference between physical changes and physical properties?

What is the difference between chemical changes and chemical properties?

Tell us what is the difference between each of the following statements?

wood burning wood burning

Ice can melt at zero degrees. Ice melts.

Exercise: Fill in the following blanks with A. physical changes B. physical properties C. chemical properties D. chemical changes.

(1) Sulfur is a light yellow solid ______________ (2) Put a small amount of sulfur powder into the burning spoon ______

(３) Place the burning spoon of (2) on the flame of the alcohol lamp and heat it, and the sulfur powder will melt_______________

(4) Continue to heat, sulfur burns in the air_______________

(5) Sulfur can burn_______________

Exercise: Which of the following descriptions are physical changes? What are chemical changes? What are physical properties? What are chemical properties?

A. Mixing limestone and dilute hydrochloric acid will release gas;

B. Pure water is a colorless and odorless liquid;

C. Magnesium strips burn in the air to produce magnesium oxide;

D. Oxygen is not easily soluble in water and is denser than air;

E. The wooden stick broke due to force.

F. Copper easily rusts and turns to patina in humid air.

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Update Time: 2024-06-30

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

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