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Authoritative PPT Summary
"Salt and Cement" PPT
Part I: Characteristics of salt and cement
Add table salt to water and observe the changes in the salt
How to get salt out of water again?
Observe changes in cement
Salt and Cement PPT, Part 2: Summary
Like salt, water, glass, etc., after a substance changes, it can be restored to its original state through a certain method. This change is called a reversible change; such as cement, wood, seeds, etc., a change that cannot be restored to its original state after a change is called an irreversible change.
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"Salt and Cement" PPT courseware:
"Salt and Cement" PPT courseware Part One: Changes in Salt Light the alcohol lamp, heat the salt water, and observe, what changes have occurred in the salt water? You can clearly see the precipitated salt particles. (restored to its original state) Experimental conclusion By giving...