"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 5

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"Entering the Chemistry Laboratory" Entering the World of Chemistry PPT Courseware 5

1. Taking solid medicines

Use of solids

lumpy

Instrument used: tweezers

Operation key: one horizontal, two released, three slow vertical

Powder

Instrument used: medicine spoon

The key to the operation: one inclined, two sent to the bottom, and three upright.

2. Taking liquid medicines

(1) Take an unknown volume of liquid

a. When taking a larger amount: pouring method

b. When taking a smaller amount: use the dropper method with a rubber tip.

c. When taking a certain amount: use a measuring cylinder and a rubber dropper

(2) Taking quantitative liquids

Instruments: measuring cylinder, rubber dropper

Example 1: Now we need to measure 41mL of liquid

a. There are currently 10mL, 50mL, and 100mL measuring cylinders. Which type of measuring cylinder do you think should be selected?

"Select measuring range": Select a measuring cylinder whose measuring range is equal to or slightly larger than the volume of the liquid to be measured.

Reading of measuring cylinder

Place the measuring cylinder flat, keep your sight level with the lowest point of the concave surface of the liquid in the measuring cylinder, and then read the volume of the liquid.

When reading, only one decimal place is read out.

Think about the consequences of the following readings?

Top view: Reading > Actual volume

Looking up: reading

If the reading is high, the reading is high; if it is low, the reading is low.

1. There are three types of measuring cylinders: 10ml, 50ml, and 100ml. If you want to measure 8ml of water, which measuring cylinder is better?

2. When a student measured 8ml of water and looked up when reading, was the water that the student actually measured greater than 8ml or less than 8ml?

Taking medicines:

1. Among chemicals, some may be ______, ________, ________ and _____. Therefore, you cannot use ______ to touch the drugs, you cannot use ______ to taste the drugs, and you cannot use _____ to touch the mouth of the container. Instead of smelling the medicine, should _____?

2. What should you do if you accidentally pour alcohol on the table and burn it?

3. Dosage of medicines: 1) If the dosage is specified, strictly follow _______; 2) If the dosage is not specified, follow the most _______ principle, that is, _______ for solids and _______mL for liquids.

4. The "Three Don'ts and One Must" for the disposal of remaining medicines are not allowed to be _______, not allowed to be _______, and not allowed to be _______; they must be put into _______.

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"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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"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 the experiment: check supplies, follow instructions,...

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Update Time: 2024-10-03

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

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