"Chemistry is a science based on experiments" Enter the world of chemistry PPT courseware

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"Chemistry is a science based on experiments" Enter the world of chemistry PPT courseware

1. Chemical experiments and scientific inquiry

1. The contribution of alchemy and alchemy to chemical experiments

⑴Invention of chemical experimental equipment

⑵Invent effective methods for synthesizing substances

⑶Invent methods for separating substances

think about it

⑴Alcohol and water can be miscible in any ratio. We know that the boiling point of alcohol is 78.3°C and the boiling point of water is 100°C. How can you separate the two miscible ones?

⑵ The rolling Yellow River water carries sediment and falls from the "sky". Residents living in the lower reaches of the Yellow River want to drink the Yellow River water and ask them what measures should be taken to make the Yellow River water meet the drinking water standards.

It shows that chemical experiments are very important and we must learn to observe, operate, design and evaluate experiments.

General methods (or steps) for observing chemical experiments:

1. Observe and compare:

Pre-experimental substance

post-experiment substance

Color, state, smell, water solubility, etc.

2. During the experiment: Are there any phenomena such as luminescence, heat release, discoloration, gas, precipitation, sound, etc.

3. Analyze the causes of the phenomenon and draw conclusions. (or analyze the reasons for the failure of the experiment)

2. Activities and exploration

1. An exploration of candles and their combustion

background knowledge:

Carbon dioxide gas can turn clear limewater cloudy

Activity and Inquiry Experiment 1 - An exploration of candles and their burning

1. Before lighting:

2. Light the candle:

A. Observe how many layers the flame is divided into. Which layer is the brightest and which layer is the darkest?

B. Put the match stem flat into the flame for a second, take it out and observe it. What problem can be explained?

C. What happens if you cover the flame with a dry beaker? What problem does it explain?

D. What happens when you inject clear lime water? What problem does it explain?

3. Extinguish the candle: Can you light the white smoke?

Activity and Exploration Experiment 2 - Exploring the air inhaled and exhaled by the human body

Preparation for inquiry: Read relevant information to understand the role of breathing

Ask the question: What is the difference between the air we breathe in and the air we breathe out?

Make guesses: knowledge learned based on existing knowledge or searching information

A. The carbon dioxide content of the two is different.

B. The oxygen content of the two is different

C. The water vapor content of the two is different.

D.……

2. Research on 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.

practise

1. The substance used to detect carbon dioxide gas is ( )

A water B liquor C salt water D clarified lime water

2The gas that can cause sparks to re-ignite wood sticks is ( )

A air B carbon dioxide C oxygen D water vapor

3. When a candle burns in the air, the substance produced is ( )

A oxygen B carbon dioxide C water D carbon dioxide and water

4. Insert the burning small wooden strips into the following two gas collecting bottles. The phenomenon that occurs is ( )

A is extinguished in A and becomes prosperous in B

B becomes prosperous in A and extinguishes in B

C A and B both become prosperous

D A and B are both extinguished

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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 6:

"Chemistry is a science based on experiments" Entering the World of Chemistry PPT Courseware 6 [New Course Introduction] Chemistry is a science based on experiments. Many major discoveries and research results in chemistry are obtained through experiments. It can be seen that experiments play an important role in the chemical learning process...

"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...

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Update Time: 2024-09-12

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

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