"Chemistry Makes Life Better" Enter the Chemistry Hall PPT Courseware

Description

"Chemistry Makes Life Better" Enter the Chemistry Hall PPT Courseware

Scenario introduction

discuss:

Starting today, I will learn a new course with you. What do you want to know most about a new course now?

1. Research objects of chemistry

Summary: Substance before change Substance after change

Branch burning Branches (cellulose, etc.) carbon dioxide, water, ash, etc.

Copper ingots are drawn into copper wire. Copper (bulk) Copper (wire)

Ice melts into water Water (solid) Water (liquid)

rusty iron nails iron rust

Summarize:

changes in matter

Physical change: A change without the formation of new matter is called a physical change.

Chemical change: A change in which new substances are formed is called a chemical change, also called a chemical reaction.

Notice:

①Essential difference: whether new substances are generated.

② Accompanying phenomena:

Physical change: A change in shape or state.

Chemical changes: luminescence, heat release, color change, precipitation, and gas release.

③When chemical changes occur, they are often accompanied by physical changes. When physical changes occur, they are not necessarily accompanied by chemical changes.

Class exercises

1. Which of the following statements do you think is wrong? ( )

A. Chemical change and chemical reaction are the same concept

B. When a substance undergoes a chemical change, a physical change must occur at the same time.

C. The characteristic of chemical changes is that precipitation must occur

D. When a substance undergoes a physical change, it does not necessarily undergo a chemical change.

2. The following changes are chemical changes ( )

A. Candle burning B. Ice and snow melting

C. Perfume evaporates D. Filament glows

3. The following changes in the kitchen are physical changes: ( )

4. Which of the following poems does not involve chemical changes ( )

A. The sound of firecrackers eliminates the year old, and the spring breeze brings warmth to Tusu

B. As long as you work hard, an iron pestle can be ground into a needle.

C. Thousands of hammers carved out the mountains, and the fire burned them as if they were idle

D. Wildfires never burn out, but the spring breeze blows them again

Class summary

1. Research objects of chemistry:

1. Changes in matter

physical changes

Chemical changes

2. Properties of matter

physical properties

chemical properties

3. Chemistry is a basic natural science that studies the composition, structure, properties, change patterns, preparation and uses of substances.

2. The significance of learning chemistry:

1. Chemistry is everywhere in life

2. Chemistry makes life better

Class exercises

1. The properties of the following substances are chemical properties: ( )

A. Methane can burn in the air B. Metallic mercury is liquid at room temperature

C. Potassium permanganate is a purple-black solid D. Silver has good ductility

2. The uses and properties of substances are closely related. The following uses mainly utilize their chemical properties: ( )

3. The development of chemical science has promoted the civilization and progress of human society, and chemistry has increasingly penetrated into all aspects of social life. Which of the following do you think does not fall within the scope of chemistry research? ( )

A. The state of motion of matter B. The composition and structure of matter

C. Properties and uses of substances D. Preparation and application of substances

4. Chemistry is the key to the progress of human society. Which of the following understandings of chemistry is incorrect ( )

A. Use chemistry to develop new energy and new materials to improve the conditions for human development

B. Use food additives scientifically and rationally to improve food quality

C. The development and use of synthetic drugs can help humans prevent and treat diseases.

D. Chemistry is omnipotent and can solve all the problems in the world

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Update Time: 2024-09-06

This template belongs to Chemistry courseware Hunan Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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