"The Composition of Atoms" Exploring the Water World PPT (Lesson 2)

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"The Structure of Atoms" Exploring the Water World PPT (Lesson 2), 18 pages in total.

1. Course introduction

Copper atoms are arranged in Chinese characters on the copper surface

IBM uses atoms to create world's smallest movie

2. Introduction to new courses

1. Atom

Atoms are also particles that make up matter. Gold, diamond, etc. are all directly composed of atoms.

Atoms have the general properties of microscopic particles, such as small mass and volume, gaps and interactions between atoms, and constant motion.

2. Relative atomic mass

The mass of a hydrogen atom is:

0.00000000000000000000000000167 kg

Expressed in scientific notation: 1.67×10-27kg

Relative atomic mass definition:

International regulations: relative atomic mass is used to express the mass relationship of atoms.

[Definition] Taking 1/12 of the mass of a carbon-12 atom as a standard, the value obtained by comparing the mass of other atoms with it is the relative atomic mass of that atom. Referred to as atomic weight.

[Question] Why should the actual mass of an atom be converted into a relative atomic mass?

3. Practice in class

1. It is known that the mass of an iron atom is 9.288×10-26kg, (1/12 of the mass of a carbon 12 atom is 1.66×10-27kg), then the relative atomic mass of iron is ______ (rounded).

2. It is known that 1/12 of the mass of a carbon-12 atom is 1.66×10-27kg, and the relative atomic mass of oxygen is 16, then the actual mass of an oxygen atom is ______________.

3. There are 40 particles in an atom, 14 of which are uncharged, then its relative atomic mass is ( )

A. 13B. 14 C.40 D.27

4. Class Summary

Through this lesson we learned:

1. Atom

1. Atoms are also particles that make up matter.

2. The characteristics of atoms are: very little mass, very small body, gaps, eternal motion, same properties of the same species, and different properties of different species.

2. Relative atomic mass

1.Definition;

2.Formula;

3. Relative molecular mass ≈ number of protons + number of neutrons.

Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of the composition of atoms, PPT download of Exploring the Water World, .PPT format;

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Update Time: 2024-10-01

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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