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"Phenomena Accompanying Chemical Changes" Changes in Matter PPT Courseware
There are many phenomena that can help us determine whether a substance has undergone chemical changes.
Chemical changes are generally accompanied by
With what phenomena?
What we observed:
A red (reddish-brown) substance is produced on the iron nails, and the color of the copper sulfate liquid becomes lighter.
Is the reaction between copper sulfate solution and iron nails a chemical change?
What evidence do we use to illustrate this question?
There are many chemical changes going on around us.
The chemical change process of substances is often accompanied by various phenomena. Although the phenomena are different, they can be summarized as follows.
Chemical changes in substances are accompanied by these phenomena, and these phenomena can often help us determine whether a substance has undergone chemical changes.
1. Fill in the blanks.
2. The essential characteristic of chemical changes that is different from physical changes is _______. The phenomena accompanying the process of chemical changes include _______, _______, ________, and _________
3. Copper sulfate solution is a ________, ______ solution that can react with iron nails.
4. In the reaction between copper sulfate and iron nails:
Changes in iron nails: ____________________________
Change in solution: ____________________________.
Our conclusion: The changes that occur when the copper sulfate solution reacts with the iron nails are ______ changes. because_________________.
choose
1. The color of copper sulfate solution is ( ).
A. White B. Colorless C. Blue
2. When an iron nail is immersed in copper sulfate solution, what can be seen is ( )
A. A large number of bubbles are generated B. The solution changes color
C. There is substance attached to the iron nail
3. The changes that occur between the copper sulfate solution and the iron nails belong to ( ).
A. Physical change B. Chemical change C. Color change
judge
1. Chemical changes in substances must be accompanied by luminescence and heat generation. ( )
2. When substances undergo chemical changes, new substances must be generated. ( )
3. The change in the generated gas must be a chemical change. ( )
4. Iron rusting is a physical change. ( )
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