"Into the Science Laboratory" PPT courseware

Description

"Into the Science Laboratory" PPT courseware

Part One: Common Experimental Operations

1. Use of dropper

2. Use of alcohol lamp

3. Use of test tubes

4. Use of magnifying glass

dropper

There are two types of rubber-tipped droppers: ordinary rubber-tipped droppers and rubber-tipped droppers on dropper bottles (the rubber-tipped dropper on the dropper bottle also serves as a bottle stopper).

The main uses of rubber droppers:

1. Used to absorb small amounts of liquid.

2. Used to drop a small amount of liquid.

Entering the science laboratory PPT, part 2: usage methods and precautions:

1. Method of absorbing liquid:

Step 1: Squeeze out the air in the rubber dropper from the outside of the reagent bottle;

Step 2: Reach into the reagent bottle to absorb the liquid. (Squeeze outside and suck in inside)

2. The rubber dropper cannot cross-absorb liquid.

That is, after absorbing one reagent, it needs to be washed before absorbing another reagent.

3. Method of adding liquid dropwise:

①Hang the dropper with the rubber tip vertically, directly above the mouth of the test tube.

②Do not tilt the test tube for dripping.

③Do not extend into the test tube.

④Do not touch the inner wall of the container.

4. Do not place it flat or upside down during use.

5. The dropper on the reagent bottle does not need to be washed. It must be used exclusively for its own use and cannot be used in a pretentious manner.

6. Common sense: The volume of 20 drops of water is approximately 1ml.

Entering the science laboratory PPT, the third part: test tube

Usage: Used for reactions with small amounts of reagents.

Precautions:

①The reagent contained in the test tube cannot exceed 1/3 of the test tube.

②The test tube can be heated, but it must be held with a test tube clamp during heating.

③When heating, preheat first, and then aim the flame at the part of the medicine to heat. The test tube should not be cooled suddenly to avoid rupture.

Entering the science laboratory PPT, Part 4: The correct way to use a magnifying glass

Method 1: Put the magnifying glass close to the object being observed, keep the object motionless, and keep the distance between the human eye and the object being observed. Then move the hand-held magnifying glass back and forth between the object and the human eye until the image is large and clear.

Method 2: Hold the magnifying glass as close to your eyes as possible. Without moving the magnifying glass, move the object until the image is large and clear.

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, enter the science laboratory PPT download, .PPT format;

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"Into the Science Laboratory" PPT download:

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"Into the Science Laboratory" PPT:

"Into the Science Laboratory" PPT Part One: Learning Objectives 1. Understand the commonly used instruments in science laboratories. 2. Know the safety rules and protective measures in scientific laboratories, and recognize common danger warning signs. 3. Learn how to operate the most basic experimental equipment..

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Update Time: 2024-09-21

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 1 industry PPT template

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