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

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"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 experiments: check supplies, follow instructions, take good care of instruments, save medicines, observe carefully, record accurately, pay attention to safety, and keep clean and tidy.

4. After the experiment: Recycle waste, clean instruments, arrange supplies, pay attention to environmental protection; write an experiment report based on original records.

5. Leave the laboratory: Set up the stools and check whether the water and electricity are turned off.

2. Precautions for chemical experiments

1. Observe laboratory rules and do the "three no's" when using chemicals:

Do not touch the medicine with your hands; do not put your nostrils to the mouth of the container to smell the medicine; do not taste the medicine.

2. Do the "three no's" when using leftover drugs in the laboratory:

Do not put it back into the original bottle; do not throw it away; and do not take it out of the laboratory.

4. Access to medicines

Laboratory drug access rules:

1. When taking medicines, you should pay attention to economy. If the dosage is not stated, you should generally take it according to ________. For liquids, it is _______, and for solids, it is only __________.

2. The remaining medicines from the experiment should be put into ____________. Neither ___________, nor ___________, nor ____________.

3. If the liquid medicine is accidentally splashed into your eyes during the experiment, you should first __________

(1) Access to solid medicines:

Solid medicines are usually stored in _________, and solid medicines are usually taken with _____________. Some lumpy medicines can be picked up by _________.

Tweezers for larger solids

Medicine spoon suitable for granular or powdered solids

Paper trough suitable for granular or powdery solids

(2) Taking liquid medicines: P19

Liquid medicines are usually placed in ________.

How to pour liquid from a narrow-mouth bottle into a test tube?

Method 1: Dump

Precautions:

1. The narrow mouth bottle stopper should be placed upside down

2. The label should be pointed towards the palm of the hand

3. The mouth of the bottle should be close to each other

4. After use, cover it and put it back to the original place.

Practice: Pour the liquid in the narrow-mouth bottle into the test tube containing zinc particles until the zinc particles are covered.

Method 2: Dropwise addition

Precautions:

1. The narrow mouth bottle stopper should be placed upside down

2. Grasp the rubber dropper firmly

3. After use, cover it and put it back to the original place.

Summary: Take a certain amount of medicine

A graduated cylinder is generally used when measuring a certain volume of liquid. When using, keep the measuring cylinder steady, pour the liquid close to the required scale, and then use a rubber-tipped dropper to drop drop by drop into the measuring cylinder to the scale line. When reading, keep your sight level with the lowest point of the concave surface of the liquid in the measuring cylinder.

Looking up: the reading is too small and the actual volume of liquid taken is too large.

Top view: The reading is too high, and the actual volume of liquid taken is too small.

Abbreviation: Yang (sheep), small (tiger), big

practise:

1. Use a graduated cylinder to look up and measure 40mL of water. The actual volume of the water the student took is ____ compared to 40mL.

(Fill in “more” or “less”).

2. A student used a graduated cylinder to measure a certain volume of liquid. He first looked up and read that the volume of the liquid was 20 ml. After pouring out part of the liquid, he looked down and read that the volume was 10 ml. Then the volume of the liquid poured out is ( )

A. More than 10 ml B. 10ml

C. Less than 10 ml D. Unable to judge

4. Heating of substances

1. Heat source (heating tool): The most commonly used alcohol lamp is an alcohol burner. Sometimes an alcohol blowtorch is needed for high-temperature heating.

2. The flame of the alcohol lamp is divided into three parts: ____________. The ____________ has the highest temperature and ____________ has the lowest temperature. Therefore, when heating, the material to be heated should be placed in the outer flame part. The alcohol in the alcohol lamp should not exceed ____________.

3. How to use alcohol lamp

When using an alcohol lamp, pay attention to the following points:

a. It is absolutely prohibited to add alcohol to a burning alcohol lamp to avoid fire;

b. It is absolutely prohibited to use an alcohol lamp to ignite another alcohol lamp;

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

d. Do not knock over the alcohol lamp. If the spilled alcohol burns on the table, do not panic and cover it with a wet rag immediately.

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

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"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...

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Update Time: 2024-09-30

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

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