"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 4

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"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 4

teaching objectives

1. Understand that there are many problems worth exploring in daily life, and these problems can be solved through experiments and other means.

2. Understand that chemistry is a natural science based on experiments.

3. Cultivate students' abilities to observe, record, describe and analyze, as well as cooperate and communicate.

Observation: Observe candles, combine them with real life conditions, and summarize their physical and chemical properties.

2. Conduct experiments on burning candles

(1) Light a candle and observe what changes occur when the candle burns?

(2) Observe the layers and brightness of the flame and explore the temperature of each layer

3. What will you find if you carefully insert a glass tube into the candle flame?

What do you find when you light white smoke with a burning match?

Conclusion: It shows that wax burning is caused by wax vapor burning

4. Explore what substances may be produced after burning a candle?

Method: Take a dry beaker and a beaker with the inner wall moistened with clear lime water, and place them over the candle flame to observe the phenomenon on the inner wall.

Phenomenon (1) There is water mist on the inner wall of the beaker

(2) Clear lime water turns turbid

Conclusion: Water and carbon dioxide are produced when candles burn

1. By observing the burning of candles and exploring the combustion products, the conclusion drawn is incorrect ( )

A. It emits light and releases heat when burning.

B. Water is produced when a candle burns

C. The outer flame is the highest temperature point of the flame

D. The wax melts first and then burns

E. The candle emits white mist when extinguished

2. Which of the following is not a characteristic of chemistry learning ( )

A. Pay attention to the properties of substances

B. Pay attention to changes in substances

C. Pay attention to the change process and phenomenon of matter

D. Pay attention to the direction of movement of matter

3. British scientist Faraday once conducted an interesting "mother-child flame" experiment for children, as shown in the picture. According to this experiment, the following relevant analysis is correct ( )

A. The substance burned in the sub-flame is liquid paraffin

B． This phenomenon indicates that the main substance in the candle has a lower melting point.

C. For this experiment to be successful, the catheter should not be too long.

D． One end of the tube should be inserted into the center of the mother flame because there is sufficient oxygen there.

practise:

1. To collect indoor air samples, what collection method do you have?

Fill the gas collecting bottle with water outdoors, pour out the water in the bottle indoors and cover it with a glass piece.

2. Open the cap of the soda bottle and a large amount of gas will escape.

[Ask a question] What kind of gas might be escaping?

[Conjecture] It may be carbon dioxide

[Design experiment] Pass the escaping gas into clear lime water

[Phenomena and conclusion] Phenomenon: Clear lime water turns turbid

Conclusion The escaping gas is carbon dioxide

3. Some students suggested that clarified lime water can be used to test whether the breath exhaled by people contains carbon dioxide gas. As far as this process is concerned, it belongs to the scientific inquiry process ( )

A. Establish a hypothesis B. Collect evidence

C. Design experiments D. Make conclusions

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Update Time: 2024-10-03

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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