"Law of Conservation of Mass" Chemical Equations 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!
| 文件名 如何下载使用 | 下载次数 | Download Points | 下载地址 |
|---|---|---|---|
| "Law of Conservation of... | 15400次 | 0.00 | Free Download |
Tips: If you open the template and feel that it is not suitable for all your needs, you can search for related content "Law of Conservation of Mass" Chemical Equations PPT Courseware 5 is enough.
How to use the Windows system template
Directly decompress the file and use it with office or wps
How to use the Mac system template
Directly decompress the file and use it Office or wps can be used
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view: Click to see
How to create a high-quality technological sense PPT? 4 ways to share the bottom of the box
Notice
Do not download in WeChat, Zhihu, QQ, built-in browsers, please use mobile browsers to download! If you are a mobile phone user, please download it on your computer!
1. The manuscript PPT is only for study and reference, please delete it 24 hours after downloading.
2. If the resource involves your legitimate rights and interests, delete it immediately.
3. Contact information: service@daogebangong.com
"Law of Conservation of Mass" Chemical Equations PPT Courseware 5, due to usage restrictions, it is only for personal study and reference use. For commercial use, please go to the relevant official website for authorization.
(Personal non-commercial use refers to the use of this font to complete the display of personal works, including but not limited to the design of personal papers, resumes, etc.)
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view:Please click to see
Authoritative PPT Summary
"Law of Conservation of Mass" Chemical Equations PPT Courseware 5
think?
When a substance undergoes a chemical change and forms a new substance, what is the relationship between the sum of the masses of the reactants and the sum of the masses of the products?
propose a hypothesis
(1) The sum of the masses of the substances participating in the reaction is greater than the sum of the masses of the substances produced.
(2) The sum of the masses of the substances participating in the reaction is equal to the sum of the masses of the substances produced.
(3) The sum of the masses of the substances participating in the reaction is less than the sum of the masses of the substances produced.
1. Law of conservation of mass:
1. Explore the mass relationship between reactants and products in chemical reactions:
【Activity Research】
Exploration 1. White phosphorus combustion
Exploration 2. Reaction of iron nails and copper sulfate solution
Pay attention to observe:
(1) The state and change phenomena of reactants and products;
(2) Changes in quality.
Thoughts and Discussions
1. Are the results of the above two experiments the same as the predictions before the experiment? Why are there such experimental results? What if it is done in a closed container?
2. If a cover is placed over the burning magnesium bar and all the products are collected and weighed, what will be the experimental results?
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.
1. Each substance refers to: all reactants and all products
2. "Sum" means: including the reactants and products in various states (gas, liquid, solid). Gases invisible to the naked eye should also be considered
3. "Participate" means: the mass of the excess remaining part of the reactants should not be counted
4. The law of conservation of mass only applies to chemical changes
3. Microscopic explanation of the law of conservation of mass:
The essence of chemical reactions is the process of recombination of atoms, that is, in all chemical reactions, the type of atoms does not change, the number of atoms does not increase or decrease, and the mass of the atoms does not change. Therefore, the sum of the masses of each substance before and after the reaction must be equal.
4. Application
The idiom "turning stone into gold" originally means a spell used by ancient sorcerers, which can turn stones into gold; now it is a metaphor for turning decay into magic. Some people say that he can turn limestone into gold. Please use your chemical knowledge to explain why limestone cannot turn into gold.
Answer: The types of elements remain unchanged during chemical reactions. The main component of limestone is calcium carbonate, which is composed of calcium, carbon and oxygen. Gold is made of the element gold, so it is impossible for limestone to turn into gold.
Class exercises:
1. Which of the following particles may change before and after a chemical reaction ( )
A. Type of atom B. Number of molecules
C. Number of atoms D. Atomic mass
2. The sum of the masses of each substance participating in the reaction is equal to the sum of the masses of each substance produced after the reaction. Because of( )
A. There is no change in the type of substance after the reaction
B． There is no change in the type of molecules after the reaction
C. The type, number and mass of atoms do not change after the reaction
D． There is no change in the type, number and mass of molecules after the reaction
3. According to the law of conservation of mass, it can be inferred that after iron wire is burned in oxygen, the mass of the product ( )
A must be equal to the mass of the wire B must be less than the mass of the wire
C must be greater than the mass of the wire D. The mass cannot be determined
Let’s compete to see who is the strongest!
1. In the chemical reaction A + B = C + D, 7gA and 9gB react completely, and the mass of C produced is exactly 3 times the mass of D. Then the mass of D produced is ____.
2. In the chemical reaction A+B2=AB2, the mass relationship between A and B2 is as shown in the figure. If 5gA and 8gB2 are fully reacted, the mass of AB2 produced is ( )
A.10g B.13g
C.16g D.18g
3． The four substances A.B.C.D undergo a chemical reaction under certain conditions. After a period of time, the relevant data are measured as follows:
Answer the following questions:
(1)The mass of D after the reaction is __g
(2) Substance C may be __________ (fill in the reactant, product, catalyst)
(3) The reaction type that occurs in the container is __________ (fill in the basic reaction type)
Keywords: chemical equation teaching courseware, law of conservation of mass teaching courseware, People's Education Edition ninth grade chemistry PPT courseware download, ninth grade chemistry slide courseware download, chemical equation PPT courseware download, law of conservation of mass PPT courseware download, .PPT format;
For more information about the "Chemical Equations Law of Conservation of Mass" PPT courseware, please click the Chemical Equations ppt Law of Conservation of Mass ppt tag.
"Law of Conservation of Mass" Quantitative Study of Chemical Reactions PPT Courseware:
"Law of Conservation of Mass" PPT Courseware for Quantitative Research on Chemical Reactions Think about it: When a substance undergoes a chemical change, what is the relationship between the sum of the masses of the reactants and the sum of the masses of the products? Chemists have been concerned with this problem since early times. Option 1: Red Phosphorus..
"Law of Conservation of Mass" Chemical Changes and Their Representations PPT Courseware 3:
"Law of Conservation of Mass" Chemical Changes and Their Representation PPT Courseware 3 Experiment 1 The balance is balanced before and after the reaction Experiment 2 The balance is unbalanced after the reaction Solve the problem How to improve Experiment 3 so that the balance is still balanced after the reaction? There is gas participation, there is gas generation reaction, and the quality is verified..
"Law of Conservation of Mass" Chemical Changes and Their Representations PPT Courseware 2:
"Law of Conservation of Mass" Chemical Changes and Their Representations PPT Courseware 2 One day, Holmes was smoking his pipe as usual, and the room was filled with the pungent smell of smoke. Watson asked: Dear Sir, others say you are very smart, so can you tell me...