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

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"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 _______. Many major discoveries and research results in chemistry were obtained through _______.

(2) An important way to learn chemistry is _______. Through experiments and _______, _______ and _______ of experimental phenomena, you can discover and prove _______, learn the methods of scientific inquiry and acquire chemical knowledge.

Activity and exploration experiment 1. Exploration of candles and their burning

1. Before ignition: color, state, hardness, odor, water solubility, density

2. Light the candle: light, heat,...

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?

Questions and Analysis

Where have the candles gone? Did it disappear or turn into other substances? What if it turns into other substances? What substance is it?

in conclusion

When a candle burns, it produces carbon dioxide and water

candle + oxygen ignite carbon dioxide + water

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.……

1. Collect two bottles of exhaled air

2. Test exhaled gas and air with clear lime water

Add a few drops of clear lime water to the air and exhaled air respectively, and shake.

Phenomenon: Exhaled gas makes lime water turbid

Conclusion: Exhaled breath contains more carbon dioxide than air

3. Use burning sticks to test exhaled gases and air:

Insert small burning sticks into the air and exhaled air

Phenomenon: The small wooden sticks continue to burn in the air bottle and extinguish after a while in the exhaled gas.

Conclusion: Exhaled air contains less oxygen than air.

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

Observe the general methods (or steps) of chemical experiments

1. Observation and comparison: substance before experiment and substance after experiment

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)

practise

1. Chemistry is a natural science. An important method for learning chemistry is ( )

A. Calculation B. Measurement C. Experiment D. Reasoning

2. An important part of scientific inquiry is the design of scientific experiments. The correct steps for scientific experiment design are

A. Fully collect information B. Design a reasonable plan

C. Clarify the purpose of the experiment D. Conduct scientific experiments

E. Summary and evaluation communication

3. When a candle burns, the part with the highest flame temperature is ( )

A. Outer flame B. Inner flame C. Flame core D. The three layers are the same

4. Candles burn in the air to form ( )

A. Water B. Carbon dioxide C. Carbon dioxide and water D. Ashes

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"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...

"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: 2024-10-05

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