"Particles constituting matter" The composition of matter PPT courseware 2

Description

"Particles constituting matter" The composition of matter PPT courseware 2

do you know?

When sugar is added to water, why does every drop of water in the cup taste sweet?

Spray a little perfume into the air. Why is there a fragrance in the air?

If a piece of metal is divided infinitely, will matter still exist?

1. Matter is composed of atoms, molecules, ions and other particles

Common characteristics of the particles that make up matter

1. Extremely tiny and invisible to the naked eye

2. There is a gap between each other (the gap between particles is the largest when it is a gas)

3. Keep moving

Add drops of red ink to the water and observe the phenomenon

Heat iodine and observe the phenomenon

100ml water + 100ml alcohol

Discoloration experiment of filter paper (preliminary knowledge: phenolphthalein is a colorless indicator, which turns red when encountering alkaline substances; ammonia is an alkali, showing alkalinity)

2. Atom is a kind of particle that makes up matter.

1. Substances made of atoms include diamond, silicon, aluminum, iron, helium, silica, etc.

2. The composition of atoms

Watch animation: Atoms have complex structures

Nucleus(+)

Proton: Each proton carries one unit of positive charge

Neutron: uncharged

Extranuclear electrons: each electron carries a unit negative charge

In an atom: nuclear charge = number of protons = number of electrons

There may not necessarily be seeds in the nucleus

Different types of atoms have different numbers of protons in the nucleus and different numbers of electrons outside the nucleus.

The number of protons and neutrons in the nucleus are not necessarily equal

3. Elements

1. The concept of element: a general term for atoms of the same type with the same nuclear charge.

What determines the type of an element is the nuclear charge (number of protons); elements only talk about the type but not the number, while atoms talk about both the number and the type.

2. The meaning of element symbols

1. Represents an element

2. Represents an atom of this element

3. Indicates the relative atomic mass of the element’s atoms

The meaning of N: ① represents nitrogen element ② represents a nitrogen atom ③ represents the relative atomic mass of nitrogen atom is about 14

The meaning of 2N: 2 nitrogen atoms

When there are numbers before element symbols, the macro meaning is lost and only the micro meaning is lost.

4. Molecules are also particles that make up matter.

1. The substances composed of molecules are: nitrogen (N2) oxygen (O2) water (H2O) sulfur dioxide (SO2) alcohol (C2H5OH)

2. Molecules are composed of atoms

For example: Each water molecule (H2O) consists of 2 hydrogen atoms and 1 oxygen atom

3. Basic properties of molecules

①The molecules are very small;

②There are gaps between molecules;

③ Molecules are constantly moving;

④ Molecules are the smallest particles that maintain the chemical properties of substances; the same kind of molecules have the same properties, and different kinds of molecules have different properties.

Keywords: teaching courseware of the composition of matter, teaching courseware of particles that make up matter, download the Chemistry PPT courseware for the first volume of the ninth grade of the Hunan Education Edition, download the chemistry slide courseware for the ninth grade, download the PPT courseware of the composition of matter, download the PPT courseware of the particles that make up a substance, .PPT format;

For more information about the PPT courseware "The composition of matter and the particles that make up matter", please click the "The composition of matter ppt and the particles that make up matter" ppt tag.

"Molecular" PPT courseware of particles that make up matter:

"Molecular" PPT courseware of particles constituting matter. Can you clearly explain the following phenomena? 1. The perfume is not sprayed on your nose, so why can you smell the pungent fragrance? 2. Why do we often smell the fragrance of flowers or wine near gardens or hotels? 3. Sheng..

"Electron Configuration Outside the Atomic Nucleus" PPT courseware of particles constituting matter:

"Arrangement of Electrons Outside the Atomic Nucleus" PPT courseware of particles constituting matter 1. Arrangement of electrons outside the atomic nucleus (layered arrangement) 1. The relationship between the energy of electrons and their distance from the nucleus: One, two, three, four, five, six, seven electrons Layer K L M N O P Q Far, near, far from the core..

"Atoms" PPT courseware 2 of the particles that make up matter:

"Atoms" The particles that make up matter PPT courseware 2 1. Preliminary understanding of atoms Characteristics of atoms: Atoms are small, have mass, and have volume. How much is the mass of an atom? The mass of a carbon atom is: 0.00000000000000000000000001993kg, which is 1.993..

File Info

Update Time: 2024-10-20

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

Preview