"Conservation of Mass in Chemical Reactions" Quantitative Study of Chemical Reactions PPT

Description

"Conservation of Mass in Chemical Reactions" Quantitative Study of Chemical Reactions PPT, 24 pages in total.

learning target

1. Understand the law of conservation of mass and be able to understand the mass relationship in chemical reactions through experimental exploration;

2. Be able to explain the law of conservation of mass from the perspective of particles.

1. Based on the phenomena encountered in life, ask questions: Does the quality of substances change before and after chemical reactions?

2. Your guess is _____ (get bigger, get smaller, or stay the same);

Activity Area 5-1: Speculate the mass relationship of substances in the decomposition process of hydrogen peroxide

Question: What is the relationship between the mass of decomposed hydrogen peroxide and the mass of water and oxygen produced?

1. Which of the following two opinions do you agree with?

Hydrogen peroxide decomposes, the molecules change, and of course the mass changes!

How could the quality change?

In a chemical reaction, although the molecules change, the atoms do not change, so the mass should not change, right?

2. The following three diagrams represent the reaction of H2O2 decomposing to form H2O and O2. Which diagram do you think is correct? Why?

Experimental Exploration 5-1: Explore whether the mass of substances changes before and after chemical reactions

Option 1: Determination of the mass of white phosphorus before and after combustion

Scheme 2: Determination of the mass before and after the reaction between copper sulfate solution and sodium hydroxide solution

Option 3: Determination of mass before and after the reaction between hydrochloric acid and sodium carbonate powder

Class summary

Conservation of mass

In a chemical reaction, the sum of the masses of the substances participating in the reaction is equal to the sum of the masses of the substances produced after the reaction.

micro explanation

During chemical changes, the type, number and mass of atoms remain unchanged.

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For more information about the "Quantitative Study of Chemical Reactions and Conservation of Mass in Chemical Reactions" PPT courseware, please click the "Quantitative Study of Chemical Reactions PPT Mass Conservation in Chemical Reactions" PPT tab.

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Update Time: 2024-09-05

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

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