"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 6

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"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 6

[Introduction of new courses]

Chemistry is a science based on experiments. Many major discoveries and research results in chemistry are obtained through experiments. This shows the important position of experiments in the process of chemical learning: learning chemical experiments well will lay a solid foundation for us to learn the whole chemistry well.

The predecessor of the current chemistry laboratory was the workshop of alchemists and alchemists. Through alchemy and alchemy, many chemical experimental instruments were invented, a large amount of chemical knowledge was accumulated, and some effective methods for synthesizing and separating substances were invented.

1. Chemistry is a science based on experiments.

2. An important way to learn chemistry is through experiments.

An exploration of candles and their burning phenomena

Think about it:

1. What changes may occur when a candle burns?

2. Where does the material after the candle burns go? How to verify?

3. What are the properties of candles?

in conclusion

The flame of a candle is divided into three parts: the flame core, the inner flame, and the outer flame. The outer flame burns more fully, has the highest temperature, and the brightest flame.

Passing carbon dioxide into the clear lime water will generate new substances and make the clear lime water turbid. Generally, we use this method to identify carbon dioxide gas.

When the candle is extinguished, a wisp of white smoke will float out from the candle wick. Use a burning match to light the white smoke. The flame will follow the white smoke and relight the candle.

Characteristics of Chemistry Learning

1. Pay attention to the properties of substances

①Physical properties: color, state, odor, hardness, density, melting point, boiling point.

②Chemical properties: whether it can burn, whether its combustion products can make clear lime water turbid, etc.

2. Pay attention to changes in substances

3. Pay attention to the change process and phenomena of matter, that is, not to pay attention to a certain property or change of matter in isolation, but to conduct detailed observations and descriptions of the phenomena of matter before, during, and after change, and conduct comparative analysis. , to draw reliable conclusions

The study of the air inhaled and exhaled by the human body

background knowledge:

①Carbon dioxide (CO2) gas can make clear limewater turbid: the more turbidity, the more carbon dioxide (CO2) gas (prerequisite: there is enough clear limewater).

② Oxygen (O2) can rekindle wood sticks with sparks; the more vigorous the wood sticks burn, the more oxygen (O2) there is. That is, oxygen (O2) can support combustion.

③Carbon dioxide (CO2) can extinguish burning wood sticks, that is, carbon dioxide (CO2) does not support combustion.

Selection of good topics

1. (Henan Provincial High School Entrance Examination) In order to explore the difference between the oxygen, carbon dioxide and water vapor content in exhaled air and inhaled air, students in a research study group of a certain school designed a simple experimental plan. The main operating steps are as follows: shown. Please answer according to the diagram:

(1) How to operate in the first step?

(2) The following table is their research plan, please fill it in completely:

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"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 7:

"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 7 Read textbook P11 and answer the following questions: (1) Chemistry is a science based on _______, and there are many major discoveries and researches in chemistry. Results are obtained through _______. ..

"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 5:

"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 5 Observing the general methods (or steps) of chemical experiments Before the experiment: Observe the physical properties of the candle, color, state, shape, smell, hardness, density, dissolution During sex experiments...

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

"Chemistry is an experiment-based science" 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 an experiment-based...

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Update Time: 2024-11-15

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

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