Fifth Grade Science Volume 1, Textbook Edition
Science Edition for Sixth Grade Science Volume 2
Science Edition for Sixth Grade Science Volume 1
Third Grade Science Volume 2, Textbook Edition
Third Grade Science Volume 1, Textbook Edition
Fourth Grade Science Volume 2, Textbook Edition
Fourth Grade Science Volume 1, Textbook Edition
Fourth-grade science volume 2 of the E-education edition
Qingdao Edition Fourth Grade Science Volume 2
Hunan Education Edition Fourth Grade Science Volume 1
E-education edition fifth grade science volume 1
E-education edition fifth grade science volume 2
E-education edition sixth grade science volume 1
Fifth Grade Science Volume 2, Textbook Edition
Zhejiang Education Edition Seventh Grade Science Volume 2
Qingdao Edition Fourth Grade Science Volume 1
Category | Format | Size |
---|---|---|
E-education edition fifth grade science volume 1 | pptx | 6 MB |
Description
"Cement and Asphalt" Highway PPT Courseware 3
What we just saw was a scene of building roads and bridges. Students, think about it, what materials are usually used to build roads and bridges?
Cement, asphalt, steel, etc.
learning target
1. I know that some changes in matter are reversible and some are irreversible. Recognize the impact of these changes on human life.
2. I know that there are two major types of changes in matter, one is just a change in form, and the other will produce new matter.
3. I can carry out scientific experimental design and careful observation in cement and asphalt change experiments.
1. Observation and Experiment
1. What are the characteristics of cement and asphalt?
The shape of cement - powder.
Cement color----grey
The shape of asphalt----block
Asphalt color----black
2. What will happen when water is added to cement and mixed?
After a while it will turn into a harder block.
3. Can the cement return to its original powder form after adding water and turning it into a block?
cannot.
We call changes like cement that create new substances and cannot return to their original appearance called irreversible changes.
For example, how do people use irreversible change processes and reversible change processes?
Using the reversible process of iron melting to produce a variety of vehicles
Exploiting the possible transformation processes of asphalt to pave roads
Using the impossible transformation process of cement to build many projects
4. What will asphalt look like after heating? What does it look like after cooling?
It will gradually become liquid after heating
After cooling, it returned to its original shape.
We call asphalt a reversible change that only changes its form and can return to its original appearance.
summary
Changes in matter are divided into two categories, one is just a change in form, such as salt and sugar dissolving in water, logs are split into firewood, ice melts into water, and wheat is ground into flour; the other is a change that produces new substances. Changes, such as: stir-frying, steaming steamed buns, burning limestone into lime, burning firewood, etc.
Keywords: highway teaching courseware, cement and asphalt teaching courseware, E-education version fifth grade science PPT courseware download, fifth grade science slide courseware download, highway PPT courseware download, cement and asphalt PPT courseware download, .PPT format;
For more information about the "Highway Cement and Asphalt" PPT courseware, please click the Highway ppt Cement and Asphalt ppt tab.
"Cement and Asphalt" Highway PPT Courseware 2:
"Cement and Asphalt" Highway PPT Courseware 2 Cement and asphalt are often used in paving roads and building bridges. What do we know about cement and asphalt? Guess what happens when you add a small amount of water to cement? Experimental tips: 1. Don’t add too much water, but do it in batches.
"Cement and Asphalt" Highway PPT Courseware:
"Cement and Asphalt" Highway PPT Courseware What do you know about cement and asphalt? Guess what happens when you add a small amount of water to cement? Changes in cement: 30 seconds after mixing, the color of the cement changes to dark gray, becomes fluid, and disperses..
File Info
Update Time: 2024-10-27
This template belongs to science courseware E-education edition fifth grade science volume 1 industry PPT template
"Cement and Asphalt" Highway PPT Courseware 3 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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