"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 6

Description

"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 6

[Introduction to review]

In the last class, we learned that chemistry is a science based on experiments. We learned how to observe experiments, describe experimental phenomena, and draw experimental conclusions through analysis and reasoning. In my class, we will go into the chemistry laboratory to take a look at this important place for scientific inquiry and appreciate its mysterious charm!

1. Use of common instruments

Requirements for doing experiments well

⑴ Make preparations before class and clarify the experimental requirements.

⑵ Observe carefully during experiments, keep records realistically, analyze phenomena carefully and make experimental reports.

⑶ Waste after experiments should be disposed of as required, instruments should be cleaned in time, and the laboratory should be kept clean and tidy.

Principles of taking medicines

1. The "three no's" principle: do not touch the medicine with your hands when taking it, do not put your nostrils to the mouth of the container to smell the medicine, and do not taste any medicine.

2. Principle of economy: use according to the prescribed amount. If the dosage is not specified, generally take the minimum amount: 1~2mL for liquids, and just cover the bottom of the test tube for solids.

3. Disposal principles: The leftover drugs in the experiment can neither be put back into the original bottles nor discarded, nor can they be taken out of the laboratory. They must be placed in designated containers.

Ⅱ. Taking liquid medicines

[Thinking] 1. Why is the stopper of the narrow-mouth bottle placed upside down on the table?

Answer: Prevent liquid contamination, corrosion of the tabletop, and avoid contamination of reagents

[Thinking] 2. When pouring liquid, why should the narrow-mouth bottle be placed close to the mouth of the test tube? Should it be poured quickly or slowly?

Answer: Prevent the liquid from flowing out of the test tube. It should be poured slowly.

[Thinking] 3. When pouring liquid from a narrow-mouth bottle, why should the label side face the palm of your hand?

Answer: Prevent residual liquid from flowing down and corroding the label.

[Thinking] 4. After pouring the liquid, why should we immediately close the cork and put the bottle back to its original place?

Answer: Prevent the evaporation of the medicinal solution and avoid contamination of the reagents

Operation:

1. What to use for bulk solids? How to access it?

2. How to take the liquid medicine in the narrow-mouth bottle?

3. How to read when measuring liquid with a graduated cylinder? What would happen if you looked up?

4. If you want to measure 5ml, what size of measuring cylinder is suitable? The tube should explain how to operate.

5. What should you pay attention to when using a plastic tip dropper?

summary:

1. It is absolutely prohibited to add alcohol to a burning alcohol lamp

2. It is absolutely prohibited to use a burning alcohol lamp to light another alcohol lamp.

3. When extinguishing the alcohol lamp, cover it with the lamp cap and do not blow it with your mouth.

4. If the alcohol lamp is accidentally knocked over, cover it with a wet rag.

Discussion questions

1. When heating the liquid in the test tube, can the mouth of the test tube be pointed toward a person?

No, prevent liquid from splashing and hurting people.

2. Can the water on the outer wall of the test tube be heated directly?

No, to prevent the test tube from being heated unevenly and causing the test tube to break.

3. Can hot test tubes be rinsed directly in cold water?

No, hot test tubes will easily break when exposed to cold water

4. How to preheat the test tube?

Move the test tube back and forth to evenly heat the test tube or move the alcohol lamp to make the test tube evenly heated.

Keywords: Entering the World of Chemistry teaching courseware, Entering the Chemistry Laboratory teaching courseware, People's Education Edition 9th Grade Chemistry PPT Courseware Download, 9th Grade Chemistry Slide Courseware Download, Entering the World of Chemistry PPT Courseware Download, Entering the Chemistry Laboratory PPT courseware download, .PPT format;

For more information about the PPT courseware "Entering the World of Chemistry and Entering the Chemistry Laboratory", please click the "Entering the World of Chemistry ppt Entering the Chemistry Laboratory ppt" tag.

"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 5:

"Into the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 5 1. The use of solid medicines The use of solid medicines in block form: tweezers The key to the operation: one horizontal, two, three slow and vertical The key to the powder use: the medicine spoon The key to the operation : One oblique, two sent to the bottom, three upright... .....

"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 4:

"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 4 Access to Drugs Many drugs used in the laboratory are flammable, explosive, corrosive or toxic. Taking solid medicines Taking liquid medicines Heating substances How to use alcohol lamps Giving substances...

"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 3:

"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 3 1. Chemistry Laboratory Rules 1. Entering the laboratory: step lightly and speak in a low voice. 2. Before the experiment: Preview the content, understand the purpose, and clarify the steps. 3. During the experiment: check supplies, follow instructions,...

File Info

Update Time: 2024-11-20

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

Preview