"Law of Conservation of Mass" Source of Life - Water PPT Courseware 5 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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Authoritative PPT Summary
"Law of Conservation of Mass" Source of Life - Water PPT Courseware 5
The sum of the masses of each substance before the reaction
The sum of the masses of each substance after the reaction
Does this conclusion have general significance?
1. Law of conservation of mass
The sum of the masses of each substance participating in a chemical reaction is equal to the sum of the masses of each substance produced after the reaction. This law is called the law of conservation of mass.
Why is the sum of the masses of the substances participating in a chemical reaction equal to the sum of the masses of the substances produced after the reaction?
2. Reasons for conservation of mass before and after chemical reactions
type of atom
number of atoms
mass of atom
Class summary:
1. What knowledge did we learn in this lesson?
2. What methods did we use to study the problem in this lesson?
Raise questions→Experimental exploration→Draw conclusions→Experimental demonstration→Solve problems
3. What is our biggest gain from this class?
Knowledge comes from practice and guides our practice
Research topics:
Investigate common chemical reactions in families, daily life, and production practices, and put forward your own opinions on them that seem to violate the law of conservation of mass.
1. It is known that substance A reacts with substance B to produce substance C. If 12 grams of A and 32 grams of B react completely, the mass of substance C produced is ( )
A.32 grams B.44 grams C.22 grams D.12 grams
2. It is known that substance A decomposes to produce substance B and substance C. When a certain amount of A reacts for a while, 56 grams of substance B and 44 grams of C are generated, then the actual decomposition of substance A is ( )
2. Reasons for conservation of mass before and after chemical reactions
According to the law of conservation of mass, it is determined that in 2AB + B2 = 2C, the chemical formula of C is _______.
The products after the combustion of alcohol are carbon dioxide and water. According to the law of conservation of mass, the composition of this substance must contain ( ) elements and ( ) elements, and may contain ( ) elements.
Before and after the chemical reaction, the following items must not have changed ( )
A.Number of atoms
B. Number of molecules
C. Types of elements
D. Type of substance
E. Number of molecules of substance
F. The total number of various atoms.
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