"Phenomena Accompanying Chemical Changes" PPT download of changes in matter

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"Phenomena Accompanying Chemical Changes" PPT download of changes in matter

Part One: Exploring New Knowledge

1. Observe the reaction between copper sulfate solution and iron nails

Experimental materials: anhydrous copper sulfate, water, glass cup, iron nails, tweezers.

Experimental steps: 1. Prepare copper sulfate solution

2. Observe the reaction between copper sulfate solution and iron nails

1. Use tweezers to hold a clean iron nail, immerse it in the solution for about 4 minutes, and record the observed phenomena.

2. When we take out the iron nails, what phenomena do we observe? please record.

3. Fill in the form according to the phenomenon

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_________________.

There are many chemical changes going on around us. The chemical changes of substances are often accompanied by various phenomena. What do you know?

PPT on phenomena accompanying chemical changes, part 2: expansion and extension

Is lighting a lighter a chemical reaction?

When the lighter is ignited, the liquefied gas inside is burned into colorless carbon dioxide and water vapor. When an iron tool is used to block the flame, incompletely burned carbon black will be left on the iron tool.

The experiment produces new substances, which are chemical reactions, and the accompanying phenomena include light and heat.

PPT on phenomena accompanying chemical changes, part 3: summary of this lesson

1. Red substance will appear on the surface of the iron nail that is in contact with the copper sulfate solution, and the color of the solution will become lighter. After being left in the air for a period of time, the solution will gradually turn into reddish brown. After the iron nail reacts with the copper sulfate solution, a chemical change occurs.

2. When a substance undergoes chemical changes, it is often accompanied by phenomena such as color changes, light emission, heat generation, gas generation, and precipitation. These phenomena can often help us initially judge whether a substance has undergone chemical changes.

PPT on phenomena accompanying chemical changes, part 4 content: exercises for this lesson

1. Judgment questions

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. ( )

2. Judgment questions

1. The phenomena accompanying different substances when they undergo chemical changes are ( )

A Same B Various C Only one phenomenon is more obvious

2. ( ) This phenomenon cannot help us initially judge whether a chemical change has occurred in a substance.

A change in shape B production of gas C production of precipitation

3. The essential characteristic that chemical changes are different from physical changes is ( )

A The existence state of substance changes B Water is produced C New substance is produced

PPT on phenomena accompanying chemical changes, Part 5: Homework

Share, what kind of experience do you have after studying this course?

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For more information about the PPT courseware "Phenomena Accompanying Chemical Changes in Changes in Matter", please click on the "Phenomena Accompanying Chemical Changes ppt Changes in Matter" tag.

"Phenomena Accompanying Chemical Changes" PPT teaching courseware on changes in matter:

"Phenomena Accompanying Chemical Changes" PPT teaching courseware on changes in matter Part One: Observing the reaction between copper sulfate solution and iron nails Experimental process Carefully observe the iron nails and copper sulfate solution, and record their characteristics. Use tweezers to hold the iron nail and dip half of the iron nail into...

"Phenomena Accompanying Chemical Changes" Changes in Matter PPT:

"Phenomena Accompanying Chemical Changes" Changes in Matter PPT Part 1: Observe the reaction between copper sulfate solution and iron nails. Prepare a cup of copper sulfate solution, use tweezers to hold the iron nail and immerse part of it in the copper sulfate solution. What phenomena will occur? ? after a while,..

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Update Time: 2024-10-02

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