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

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

Summarize:

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 padded with asbestos nets for heating include: beakers, conical flasks, and flasks.

4. The reaction vessels that can be used include: test tubes, beakers, Erlenmeyer flasks, flasks, and gas bottles.

practise:

1. What should not be used as a reaction vessel during experiments ( )

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

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

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

3.Which of the following statements about the function of glass holder is wrong ( )

A. Dip the test solution B. Stir the solution C. Drain the liquid D. Grind the solid

4. Which of the following instruments is used improperly ( )

A. Use a dropper bottle to hold liquid medicines B. Carry out chemical reactions in test tubes

C. Use a graduated cylinder to measure the liquid. D. Use a thermometer to stir when dissolving solid drugs.

5. Which of the following experimental items has the wrong instrument ( )

A. Reaction of a small amount of reagent - test tube B. Absorbing and dropping a small amount of liquid - rubber dropper

C. Heating a large amount of liquid - beaker D. Holding solid medicine - narrow mouth bottle

Basic experiment operations

① Pay attention to the "three don'ts" for safety: do not touch medicines with your hands, do not put your nostrils to the mouth of the container to smell the medicine, and do not taste any medicine in your mouth.

② If there is no special instructions on the dosage, follow the principle of economy: 1 to 2 mL of liquid; cover the bottom of the test tube with solids.

③Remaining medicines cannot be put back into the original bottles, cannot be discarded at will, and cannot be taken out of the laboratory. They must be placed in designated containers.

1. Taking solid medicines

(1) Powder form: “One flat, two free, three straight”

(2) Block shape: "One flat, two flat, three slow sliding"

2. Taking liquid medicines

(1) Pouring of liquid

① Bottle stopper: put upside down

②Label: towards the palm of your hand

③Bottle mouth: close to

(2)Measurement of liquid

① Dumping: Stop dumping when it is almost close to the required scale line

②Drip addition: Place the measuring cylinder flat on the table, use the dropper to exhaust air, absorb liquid, hang vertically, directly above, and use the three "don'ts"

③Reading: Place the measuring cylinder flat, and keep the line of sight at the lowest point of the concave liquid surface of the measuring cylinder liquid.

think

After heating the solid material in the test tube, it is found that the test tube ruptures. What are the possible reasons?

Answer: ① There is water on the outer wall of the test tube during heating

② No preheating

③ The bottom of the test tube touched the wick during heating

④ The test tube mouth is not tilted downwards

⑤ Clean the test tube without cooling it

Class exercises

1. When conducting chemical experiments, if the amount is not specified, the minimum amount of liquid should be ( )

A. 0.5mL B. 1-2mL C. 3-4mL D. 5-6mL

2. Among the following experimental operations, the incorrect one is ( )

3. Among the following experimental operations, the correct one is ( )

4. When reading the volume of liquid in a graduated cylinder, a student looked up and read 20 mL, then the actual volume is ( )

A. 20 mL B. Less than 20 mL

C. Greater than 20 mL D. Unable to judge

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

"Journey to the Chemistry Laboratory" Everyone Comes to Learn Chemistry PPT Courseware 2 1. Use of Commonly Used Chemical Experiment Instruments Chemistry Laboratory Rules Rules for Placing Drugs in the Laboratory Classification and Placement of Test Tubes Main Purpose: Used as a reaction vessel for a small amount of reagents, Use at room temperature or when heated..

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Update Time: 2024-10-01

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

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