"Chemistry makes the world a better place" into the chemistry PPT courseware

Description

"Chemistry makes the world a better place" into the chemistry PPT courseware

learning target

1. Understand the objects of chemical research;

2. Understand the concepts of physical changes and chemical changes, and be able to judge changes in some substances in daily life;

3. Understand the concepts of physical properties and chemical properties, and be able to distinguish which are physical properties and which are chemical properties.

What is chemistry?

What is the use of studying chemistry?

1. What kind of subject is chemistry?

Thinking: Why does iron rust easily but stainless steel does not?

Thinking: What are the differences between tap water, mineral water and purified water?

Thinking: Why can batteries release electricity? How are beautiful fireworks produced?

Chemistry is a natural science that studies matter. It is dedicated to studying the composition and structure, properties and changes, preparation and uses of matter.

water heating

Liquid water boils when heated and turns into water vapor. The water vapor turns into liquid again when it encounters the glass piece.

Magnesium bar burning

Burns violently, emits dazzling white light, emits a large amount of heat, produces white smoke, and produces a white powdery solid

Magnesium bar reacts with dilute hydrochloric acid

The magnesium strip reacts violently with dilute hydrochloric acid, generating a large number of bubbles and causing the magnesium strip to become smaller.

A change in which no new matter is produced, but only a change in state, is called a physical change.

Three-state changes of water, volatilization of gasoline, etc.

Changes in which new substances are produced are called chemical changes.

Magnesium strips burn, steel rusts, etc.

The essential difference between the two changes: whether new matter is generated during the change.

The basic characteristic of chemical changes is the generation of new substances, often accompanied by phenomena such as luminescence, heat release, discoloration, gas generation or precipitation.

The properties that a substance can exhibit without chemical changes are called physical properties.

Color, state, odor, melting and boiling point, hardness, density, solubility...

The properties that a substance exhibits during chemical changes are called chemical properties.

Flammability, acidity, alkalinity, corrosiveness...

The difference between the properties and changes of matter: Properties are the unique attributes of the substance itself, while change is the process of material movement.

The essence of chemical change is the process of molecules breaking down into atoms and atoms combining into new molecules.

Classic examples

Knowledge point 1: What kind of subject is chemistry?

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

A. Food spoilage B. Steel rust

C. Gas explosion D. Boiler explosion

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

A. The light bulb glows B. The air liquefies

C. Photosynthesis D. Seawater sun salt

Knowledge training

1. Which of the following are physical changes ( ) which are chemical changes ( ) which are physical properties ( ) which are chemical properties ( )

A. Patina will decompose when heated

B. Pure water is a colorless and odorless liquid

C. The magnesium ribbon burns in the air and turns into magnesium oxide.

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

E. The wooden stick broke due to force

2. Iron rusts easily in humid air, which is iron ()

A. physical changes

B． Chemical changes

C. physical properties

D． chemical properties

3. Among the following statements, the former belongs to the physical properties of matter, and the latter belongs to chemical properties ( )

A. Iron rusts in the air; candles melt

B. Oxygen is a colorless and odorless gas; sulfur dioxide has a pungent smell

C. Liquid oxygen is a light blue liquid; basic copper carbonate easily decomposes when heated

D. Alcohol evaporates; magnesium strips burn in the air

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"Chemistry makes the world a better place" into the chemistry PPT courseware 2:

"Chemistry Makes the World Better" Introducing Chemistry PPT Courseware 2 Learning Objectives 1. Understand the development history of chemical science; 2. Know the help of chemistry to social life, and use chemistry to create a better life. 2. The origin and development of chemistry Before the 17th century: the ancient chemistry period..

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Update Time: 2024-07-12

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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