"Method of Separating Salt and Water" Dissolving PPT

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"Method of Separating Salt and Water" Dissolving PPT

Part 1: Will salt and water evaporate together?

Observing the concentrated salt water we collected in the experiment, there is still undissolved salt at the bottom of the cup. Use a pen to mark the level of concentrated salt water. Add water little by little until all the salt in the cup is dissolved.

Place the cup on the windowsill and let the water in the cup evaporate. Observe what happens to the dissolved salt. Can we explain this phenomenon?

If all the water in the cup evaporates, what happens to the salt that was originally dissolved in the water?

Will table salt evaporate with the water?

Method for separating salt and water PPT, Part 2: White particles in the evaporating dish

How can we observe the phenomenon of water evaporation faster?

Pour some concentrated salt water, about 10 ml, into the evaporating dish. Heat and evaporate as shown in the picture.

Notice:

Be sure to use the alcohol burner correctly.

Extinguish the alcohol lamp before the salt water has completely evaporated.

The heated evaporating dish, tripod, asbestos net, etc. will still be very hot for a long time, so pay attention to safety.

Learn to use alcohol lamp correctly

The flame of the alcohol lamp is divided into three parts: outer flame, inner flame and flame core. The temperature of the outer flame is the highest, followed by the inner flame, and the temperature of the flame core is the lowest. Objects should be heated over an external flame.

Be sure to use a burning match when lighting an alcohol lamp, and never use a burning alcohol lamp against the fire.

When it is necessary to turn off the flame after heating, the lamp cap can be used to put it out. After the lid is put out, it needs to be re-covered to prevent the lamp cap from being unable to open during future use. It is absolutely forbidden to blow out fire with your mouth!

Keywords: Free download of Chinese PPT courseware for the first volume of the fourth grade of the textbook version, PPT download of the method of separating salt and water, PPT download of dissolution, .PPT format;

For more information about the PPT courseware "Methods to Dissolve and Separate Salt and Water", please click the "Methods to Dissolve and Separate Salt and Water" ppt tag.

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Update Time: 2024-10-13

This template belongs to science courseware Fourth Grade Science Volume 1, Textbook Edition industry PPT template

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