"Representation of Material Composition" PPT of the Air Around Us (Lesson 2)

Description

"Representation of Material Composition" PPT of the air around us (Lesson 2), 14 pages in total.

new knowledge learning

Knowledge points: Quantitative representation of material composition

Take the chemical formula AmBn as an example, where the relative atomic mass of A is a and the relative atomic mass of B is b:

1. Chemical formula weight (relative molecular mass) = am + bn.

For example, the relative molecular mass of H2O = __________ = _________.

2. The mass ratio of elements A and B = (am): (bn).

For example, the mass ratio of hydrogen and oxygen elements in H2O = ____________ = _________.

Interactive exploration

Exploration Points Calculations related to chemical formulas in tags

[Question Research] As shown in the picture is the label of a bag of ammonium bicarbonate (chemical formula is NH4HCO3) fertilizer. Is the nitrogen content marked on this bag of fertilizer true?

[Inductive improvement] Labels usually include the composition of the substance, as well as numerical information such as purity, content (mass), mass fraction of a certain element or a certain solute. The key to solving the problem is to grasp the numerical information and Relevant essentials of chemical calculations and calculations.

Core Calculation based on chemical formula

Example [2017·Taian] The popularity of "A Bite of China" on CCTV has once again made the kitchen a stage for people to show off their cooking skills. Most chefs have a working experience: when cooking, adding cooking wine and vinegar can make the dishes delicious. It is delicious because the acetic acid in the vinegar and the ethanol in the cooking wine form ethyl acetate. The table below shows several common esters. Please complete the following questions.

Class feedback

Knowledge point 1: Calculation based on chemical formulas

1. Vinegar contains acetic acid (CH3COOH). Which of the following statements about acetic acid is correct ()

A. The relative molecular mass of acetic acid is 60 g.

B. The mass ratio of the three elements C, H, and O in acetic acid is 1:2:1

C. The mass fraction of carbon in acetic acid is 60%

D. 1 acetic acid molecule consists of 8 atoms

Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of the representation of material composition, PPT download of the air around us, .PPT format;

For more information about the "Representation of the Material Composition of the Air Around Us" PPT courseware, please click on the Representation of the Material Composition of the Air Around Us PPT tab.

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"Representation of Material Composition" PPT of the Air Around Us (Lesson 1):

"Representation of Material Composition" PPT of the air around us (Lesson 1), 30 pages in total. New Knowledge Learning Knowledge Point 1 Chemical formulas and their meanings 1. The concept of chemical formula A formula that uses ____________ and _________ to represent _________ of a substance is called a chemical formula. 2. Chemistry..

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Update Time: 2024-11-25

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

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