"Journey to the Chemistry Laboratory" Everyone Comes to Learn Chemistry PPT Courseware 2

Description

"Journey to the Chemistry Laboratory" Everyone Comes to Learn Chemistry PPT Courseware 2

1. Use of commonly used chemical experimental instruments

Chemistry Laboratory Rules

The rules for placing drugs in the laboratory

Classified placement

test tube

Main purpose: used as a reaction vessel for a small amount of reagents, used at room temperature or when heated.

Note: Do not cool quickly after heating to prevent explosion.

Test tube clamp

Main purpose: used to clamp test tubes

Precautions: Prevent burning and corrosion

glass rod

Main uses: used to divert water when stirring, filtering or transferring liquids, and to pick up small amounts of solids or liquids

alcohol lamp

Main use: for heating

Note: Use external flame for heating, use a match or lighter to light the alcohol lamp, and cover it with a lamp cap when it goes out. It is absolutely forbidden to add alcohol to a lit alcohol lamp, and it is absolutely forbidden to use an alcohol lamp to ignite another alcohol lamp to avoid fire. It is absolutely forbidden to blow out the alcohol lamp with your mouth. When adding alcohol to the lamp, it should not exceed two-thirds and not less than one-fourth of the volume of the alcohol lamp. If spilled alcohol ignites on the table, cover it with a damp cloth immediately.

2. Basic operations of chemical experiments

Access to chemicals

Basic knowledge:

1. Principles for taking medicines: “Three No’s”

①Do not touch medicines with hands

②Do not put your nose to the mouth of the bottle to smell the smell of medicine (especially gas).

The way to smell the smell of medicines is to "smell", that is, put the air into the nose and smell it from far to near.

③Do not taste any medicines

2. Pay attention to saving drugs when doing experiments:

①If the dosage is stated, use the specified amount.

②When the dosage is not specified:

Take 1-2 ml of liquid;

The solids only need to cover the bottom of the test tube.

3. Handling of medicines:

① Disposal of leftover medicines: Do not put them back into the original bottles, do not throw them away at will, let alone take them out of the laboratory, and put them into designated containers.

② Disposal of discarded medicines: Pour them into waste tanks or designated containers.

heating of objects

1. Use of alcohol lamp

Heat source: Alcohol lamp

Flame: three parts: outer flame, inner flame, and flame core. Among them, the outer flame temperature is the highest and the flame core temperature is the lowest. The outer flame part should be used when heating

The amount of alcohol in the alcohol lamp: should be between 1/4-2/3 of the volume of the alcohol lamp

Usage and precautions:

Use a match or lighter to light the alcohol lamp. When it goes out, cover it with the lamp cap. Do not blow it out with your mouth.

Two absolute prohibitions: It is absolutely prohibited to add alcohol to a burning alcohol lamp; it is absolutely prohibited to use an alcohol lamp to ignite another alcohol lamp to avoid fire.

If spilled alcohol catches fire on the table, cover it with a damp cloth immediately

2. Instruments used for heating:

a. Liquid heating instruments: test tubes, flasks, beakers, Erlenmeyer flasks, evaporating dishes, etc.

b. Solid heating equipment: test tubes, evaporating dishes, etc.

c. Direct heating instruments: test tubes, evaporating dishes.

d. Instruments that cannot be heated directly: beakers, flasks, Erlenmeyer flasks. (Asbestos net required)

e. Instruments that cannot be heated: gas bottles, sinks, funnels, and measuring cylinders.

3. Laboratory safety knowledge

When entering a chemical laboratory, you must strictly abide by the operating rules to protect yourself and others. In case of accident. Don't panic and take appropriate measures immediately.

(1) Do not touch the medicine with your hands, and do not put your nostrils to the mouth of the container to smell the medicine (especially gas). Do not taste any medicine.

(2) Do not put the remaining medicines back into the original bottles, do not throw them away, and do not take them out of the laboratory. Put it into the designated container.

(3) Special care must be taken when using highly corrosive chemicals such as concentrated acid and alkali. Prevent skin or clothing from being corroded. Pay special attention to protecting your eyes during the experiment. If the goggles splash into a dilute acid or alkali solution, rinse them immediately with water (do not rub your eyes with your hands), and seek medical treatment if necessary.

(4) When using an alcohol lamp, it is absolutely forbidden to add alcohol to a burning alcohol lamp, and it is absolutely forbidden to use an alcohol lamp to ignite another alcohol lamp to avoid fire. When adding alcohol to the lamp, it should not exceed two-thirds of the volume of the alcohol lamp. If spilled alcohol ignites on the table, cover it with a damp cloth immediately.

(5) When burned. Immediately rinse the burnt area with water and then apply burn ointment; for cuts, disinfect and bandage them immediately.

Class exercises

1: It is not easy to make a reaction vessel during experiments ( )

A. Test tube B. Graduated cylinder C. Gas collecting bottle D. Erlenmeyer flask

2: When taking a certain amount of liquid in the laboratory, one of the following instruments ( ) should be used

A. Test tube B. Dropper C. Beaker D. Graduated cylinder

3: The following instruments can be heated directly on the flame of an alcohol lamp ( )

A.Funnel B.Beaker C.Graduating cylinder D.Test tube

Keywords: Everyone Comes to Learn Chemistry Teaching Courseware, Chemistry Laboratory Tour Teaching Courseware, Guangdong Education Edition Ninth Grade Chemistry PPT Courseware Download, Ninth Grade Chemistry Slide Courseware Download, Everyone Comes to Learn Chemistry PPT Courseware Download, Chemistry Laboratory Journey PPT courseware download, .PPT format;

For more information about the "Everyone Comes to Learn Chemistry Chemistry Laboratory Tour" PPT courseware, please click the Everyone Comes to Learn Chemistry ppt Chemistry Laboratory Tour ppt tag.

"Chemistry Laboratory Journey" Everyone Comes to Learn Chemistry PPT Courseware:

"Chemistry Laboratory Journey" Everyone Comes to Learn Chemistry PPT Courseware Summary: 1. Containers that can be used for heating include: test tubes, beakers, Erlenmeyer flasks, flasks, and evaporating dishes. 2. Among them, test tubes and evaporating dishes can be heated directly. 3. The instruments that need to be heated with asbestos mesh are...

File Info

Update Time: 2024-07-06

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

Preview