"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware

Description

"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware

teaching objectives

Review: 1. Apply chemical formulas to calculations

2. Calculation using the law of conservation of mass

New Lesson: Applying Chemical Equations to Calculations

understand:

1. If the mass of one reactant is known, find the mass of another reactant or product.

2. If the mass of one product is known, find the mass of another product or reactant.

(1) 24 grams of magnesium react exactly with 16 grams of oxygen. The mass of magnesium oxide produced is ____ grams

(2) In the reaction A+B=C+D, it is known that 2 grams of A and 5 grams of B participate in the reaction and 4 grams of C are produced, then ____ grams of D are produced.

(3) In the chemical reaction A+B=C, 4 g A reacts with a sufficient amount of B to obtain 12 g C. If there are 12 g A, it can react completely with ___g B.

What is the significance of chemical equations? (Take the reaction of electrolyzing water as an example)

2H2O=2H2↑+O2↑

[Quality] 1. It means that water generates hydrogen and oxygen under the condition of electricity.

[Quantity] 2. It means that every 36 parts of water by mass react completely under the condition of electricity, generating 4 parts by mass of hydrogen and 32 parts by mass of oxygen.

[Quantity] 3. It means that every 2 water molecules react completely under the condition of electricity, generating 2 hydrogen molecules and 1 oxygen molecule.

Scenario import

Hydrogen is the ideal fuel for the cars of the future. 1Kg of hydrogen can power a car with a power of 50KW to run about 100Km.

Water is the source of life. If you find a suitable catalyst, you can use light energy to decompose water to produce hydrogen.

If you want to know how far the car can run, you need to find out how much hydrogen can be produced by decomposing the 18Kg of water in the keg? (How many ways can you calculate it?)

Idea 1: It can be solved based on calculations of chemical formulas. (H-1, O-16)

Reason: All the hydrogen elements in the water are converted into hydrogen gas.

Idea 2: Use chemical equations to calculate. (H-1, O-16)

Summarize the rules:

In a chemical reaction, the mass ratio between reactants and products is ______. Therefore, using this proportional relationship, the mass of one reactant (or product) can be used to calculate the mass of another product (or reactant) according to the chemical equation.

Summary of findings:

【Three essentials】

(1) The steps must be complete (assume, write, calculate, mark, list, solve, and answer);

(2) The format must be standardized;

(3) The number must be accurate (retaining two decimal places);

【Three keys】

(1) Write chemical equations accurately;

(2) Accurately calculate relative molecular mass;

(3) The quantities substituted refer to the mass of the pure substance (the unit must be substituted into the calculation process);

think about it

Communication and expression:

After studying this course, what have you learned and inspired?

1. In chemical equations, if you know the mass of the reactant (or product), you can use the mass ratio between substances to calculate the mass of the product (or reactant).

2. The calculation format using chemical equations must be standardized.

3. The calculation of chemical equations can enhance production planning and facilitate the rational use of resources.

Keywords: chemical equation teaching courseware, simple calculation teaching courseware using chemical equations, PPT courseware download for the first volume of the ninth grade chemistry of the People's Education Edition, downloading the ninth grade chemistry slide courseware, downloading chemical equation PPT courseware, simple calculation using chemical equation PPT courseware Download, .PPT format;

For more information about the "Chemical Equations Simple Calculations Using Chemical Equations" PPT courseware, please click on the Chemical Equations ppt Simple Calculations Using Chemical Equations ppt tag.

"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 7:

"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 7 Review Questions Take the combustion of magnesium in air as an example to illustrate one of the meanings of chemical equations. The mass ratio between the reactants and products in the combustion reaction of magnesium in air 1. The mass of the known reactants...

"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 6:

"Simple Calculations Using Chemical Equations" Chemical Equations PPT Courseware 6 Learning Objectives 1. Further understand the meaning of chemical equations, and be able to perform simple calculations based on correctly writing chemical equations. 2. Master the ideas and rules for calculating chemical equations..

"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 5:

"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 5 Learning Objectives 1. On the basis of understanding the meaning of chemical equations, master the calculation of the mass of reactants and products. 2. Master the calculation of chemical equations through relevant chemical equation calculations..

File Info

Update Time: 2024-07-03

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

Preview