"Experiment is the basis of chemistry" into the chemistry PPT courseware

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"Experiment is the basis of chemistry" into the chemistry PPT courseware

1. Access to chemicals

1. Taking solid medicines

① Block solid or metal particles

Use tweezers to remove

②Solid powder

Use medicine spoon or paper trough to take

2. Taking liquid medicines

① Pour large amounts of liquid directly

②A certain amount of liquid

Graduated cylinder and dropper

Your line of sight should be level with the lowest point of the concave surface of the liquid in the measuring cylinder.

③A small amount of liquid with a rubber dropper

2. Heating of substances

1. How to use alcohol lamp

① It is absolutely forbidden to add alcohol to a burning alcohol lamp to avoid fire

②It is absolutely prohibited to use an alcohol lamp to ignite another alcohol lamp

③After using the alcohol lamp, you must cover it with the lamp cap and do not blow it with your mouth.

④ Use a wet rag to extinguish the alcohol lamp

2. Heating the substance

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

No, because the boiling liquid will splash out of the test tube and injure people.

② If there is water on the outer wall of the test tube, can it be heated directly without wiping it dry?

No, because direct heating will cause the test tube to explode due to uneven heating.

③Can a test tube that heats a liquid to boiling be immediately rinsed with cold water?

No, because hot test tubes will burst when they come into contact with water.

④How to preheat the liquid in the test tube?

Move the outer flame of the alcohol lamp back and forth to heat

3. Connect instruments and devices

1. Insert the glass tube into the rubber stopper with a hole

2. Connect the glass tube and rubber tube

3. Put a rubber stopper in the mouth of the container

4. Check the air tightness of the device

4. Washing equipment

When the water attached to the inner wall of the washed glass instrument neither gathers into droplets nor flows down in strands, it means that the instrument has been cleaned.

Consolidation exercises

1. Which of the following options do you think does not belong to the scope of chemical research ( )

A. The composition and structure of matter B. The changes and properties of matter

C. The state of motion of matter D. The use and preparation of matter

2. Which of the following are physical changes ( )

A. Rice turns into wine B. Kitchen knife becomes rusty

C. Drying wet clothes D. Food spoilage

3. What is the correct way to deal with the remaining drugs in the chemistry laboratory ( )

A. Take it home B. Pour it into the designated container

C. Pour it into the sink at will. D. Pour it back into the original reagent bottle.

4. When selecting a collection method for laboratory gas production, the following properties do not need to be considered ( )

A. Color B. Density

C. Solubility D. Whether it reacts with water

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"Experiment is the basis of chemistry" Enter the chemistry PPT courseware 2:

"Experiment is the basis of chemistry" Enter the chemistry PPT courseware 2

1. Entering the chemistry laboratory

Basic requirements for chemical experiments:

1. Strictly abide by operating rules to protect the safety of yourself and others.

2. Food and drinks cannot be brought into the laboratory.

3.Cannot be in...

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Update Time: 2024-11-21

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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