| Category | Format | Size |
|---|---|---|
| Lu Jiao Edition Ninth Grade Chemistry Volume 1 | pptx | 6 MB |
"Basic Skills Training for Chemistry Experiments" Exploring the Water World PPT
Description
"Basic Skills Training for Chemistry Experiments" Exploring the Water World PPT, 15 pages in total.
Weighing of substances
How to weigh this baby elephant?
Precautions
Before weighing dry solid pharmaceuticals, place a clean piece of paper of the same size on each of the two trays, and then weigh the pharmaceuticals on the paper.
Drugs that are easily deliquescent and corrosive must be weighed in glassware (such as small beakers, watch glasses).
Before weighing, adjust the balance of the balance: first move the balance to the zero mark, and then adjust the balance nut until the balance is balanced.
Left object and right code: reading (mass of substance = mass of weight + mass of swimming code).
When weighing a substance of unknown mass, place the weights from large to small.
Class exercises
1. When Xiao Ming used a tray balance to weigh salt, he mistakenly placed the salt in the right plate and the weight in the left plate. The mass of the salt was 15.5g (use a weight for less than 1g). If weighed correctly, the mass of these salts should be ( )
A. 15g B. 15.0g C. 14.5g D. 14.0g
2. When a student uses a measuring cylinder to take a liquid, he places the measuring cylinder smoothly on the experimental table, keeping his sight level with the lowest point of the concave surface of the solution, and the reading is 18ml; after pouring out part of the liquid, he looks down at the lowest point of the concave surface, and the reading is 12ml, then the actual volume of liquid poured by the student is ( )
A. Definitely larger than 6ml
B. Definitely less than 6ml
C. Definitely equal to 6ml
D. May be greater than or less than 6ml
Keywords: Free download of chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of basic skills training in chemical experiments, PPT download of exploring the water world, .PPT format;
For more information about the PPT courseware "Exploring the Water World Chemical Experiment Basic Skills Training", please click the "Exploring the Water World PPT Chemical Experiment Basic Skills Training PPT" tab.
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"Basic Skills Training for Chemistry Experiments" Entering the Palace of Chemistry PPT (Heating of Substances in Lesson 2), 29 pages in total. Lay a solid foundation 1. [High School Entrance Examination Yichang] Which of the following is correct about the use of alcohol lamps ( ) 2. The alcohol lamp is a commonly used heating tool in chemical experiments. The following are related...
"Basic Chemistry Experiment Skills Training" Entering the Palace of Chemistry PPT (How to take medicines in the first lesson):
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"Basic Chemistry Experiment Skills Training" Entering the Palace of Chemistry PPT:
"Basic Skills Training for Chemistry Experiments" Entering the Palace of Chemistry PPT, 26 pages in total. Understand the laboratory safety rules Laboratory safety rules 1. Do not eat, drink, play or talk loudly in the laboratory. 2. Keep flammable and explosive drugs away from fire sources; avoid corroding...
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Update Time: 2024-07-02
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