"Experience Chemistry Exploration" Entering the Palace of Chemistry PPT (Lesson 1)

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"Experience Chemistry Exploration" Entering the Palace of Chemistry PPT (Lesson 1), 14 pages in total.

1. Introduction of new courses

Chemistry is so amazing. It is almost everywhere, affecting our lives all the time, and constantly pushing forward the development of human society. Every achievement in chemical science is obtained through scientific inquiry, which is also an important way for us to learn chemistry. So, how to carry out chemical scientific inquiry?

2. Start with the problem

In ancient times, people would use candles for lighting; in modern daily life, people often use candles to create the sweetness and romance of love.

[Thinking] Have you thought more about the phenomenon of candle burning? For example, what are candles made of? What does it produce when burned? Besides burning, what properties does it have?

1. Before lighting

(1) Use all senses except taste to observe a candle before lighting it, and make a detailed and objective description and record of the observed phenomenon in the table.

(2) Is the density of a candle greater or less than water?

Conclusion: The hardness of candles is small, difficult to dissolve in water, and the density is smaller than water

2. When lit

Conclusion: Paraffin melting is a physical change, and paraffin burning is a chemical change.

[Discussion] Through exploration activities, what do you think should be paid attention to in chemical experiments?

1. Pay attention to the properties of substances, such as color, smell, state, solubility, etc.

2. Pay attention to the changes of substances, such as: luminescence, heat release, gas generation, precipitation, etc.

3. Pay attention to the change process and phenomena of matter, including before change, during change, after change, etc.

3. Classroom exercises

After exploring candles and their combustion, answer the following questions:

(1) Take a candle and cut off a small piece with a knife, indicating that the paraffin is _________; put the candle into water, the candle will float on the water, indicating that the candle is _________ soluble in water and its density is ______ than water.

(2) The operation method for testing the formation of water when burning paraffin is: ____________________________________________________________.

(3) Place a beaker with the inner wall dipped in clarified lime water over the candle flame. The purpose of this experiment is ____________________________.

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For more information about the PPT courseware "Step into the Hall of Chemistry and Experience Chemical Exploration", please click the PPT tag of "Step into the Hall of Chemistry and Experience Chemistry Exploration".

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"Experience Chemistry Exploration" Entering the Palace of Chemistry PPT (Lesson 2):

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Update Time: 2024-11-19

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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