"Separation of Matter" PPT courseware

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"Separation of Matter" PPT courseware

Part One: Precipitation Method

1. As shown in Figure 1-52, take a cup of mud water and let it sit for 5 minutes to see if any impurities settle at the bottom of the cup.

2. Add a little alum or activated carbon to the mud water, let it sit for 5 minutes, and observe the changes in the mud water and the changes in the size of the solid particles that sink to the bottom of the cup.

①There is a solid __________ at the bottom of cup A

②The size of solid particles in cup B is _________, and the mud water is _________

Precipitation method: A method of precipitating impurities in water to the bottom of the water.

Principle: Different solubility of substances

Scope of application: used to separate mixed insoluble solid impurities in liquids

The function of the coagulant is to condense suspended impurities in the water into larger particles and slowly sink to the bottom of the water.

Alum is a coagulant

Separation of substances PPT, part 2: filtration method:

A method of separating insoluble solids from liquids.

(1) Principle: According to the solubility of substances.

(2) Scope of application: remove insoluble solid impurities in liquids.

(3) Basic operations: dissolution and filtration.

(4) Required instruments: beaker, glass rod, funnel, filter paper, iron stand.

Filtration requirements

"One stick, two low, three rely"

One piece of filter paper should be close to the inner wall of the funnel

Second low

①The edge of the filter paper is lower than the edge of the funnel

②The liquid level must be lower than the edge of the filter paper.

Three things to rely on

①When pouring liquid, keep the beaker close to the glass rod

②Place the end of the glass rod gently against the side of the three-layer filter paper

③The lower end of the funnel is close to the inner wall of the container that receives the liquid.

Separation of substances PPT, part 3 content: Think about it:

1. What are the possible reasons why the filtrate is still turbid after filtration?

(1) The filter paper is damaged

(2) The edge of the filtrate is higher than the edge of the filter paper

(3) The instrument is not clean, etc.

It should be filtered again until clear.

2. After the river water is filtered, can the filtrate be drunk?

No, because filtration cannot remove soluble impurities and microorganisms

Separation of substances PPT, Part 4: Distillation method

Put the above treated filtrate and the small stones to prevent bumping into the distillation flask, and conduct distillation according to the device shown in Figure 1-54. What does distilled water look like? What's left in the flask?

Operation points:

(1) The glass bulb at the lower end of the thermometer is located at the branch mouth of the distillation flask.

(2) Add broken porcelain pieces to the distillation flask to prevent bumping.

(3) The function of the asbestos net is to heat the flask evenly.

(4) The direction of water flow in the condenser tube: bottom to top to ensure more complete cooling.

(5) Application of distillation method: extracting fresh water from seawater.

Separation of substances PPT, Part 5: How to refine coarse salt

1. Ask questions:

How is kosher salt refined? What substances may be in kosher salt?

2. Establish hypotheses:

Refined salt may contain table salt, sediment, and other crystals;

3. Design experimental plan

Beaker, funnel, glass rod, iron stand, iron ring, filter paper, alcohol lamp, evaporating dish

The function of glass rod:

1. Dissolve - stir to accelerate dissolution

2.Filtering-draining traffic

3. Evaporation and crystallization - Stir to make all parts of the liquid heat evenly and prevent the liquid from splashing out due to local overheating.

Separation of Matter PPT, Part Six: Practice

1. Which of the following mixtures can be separated by filtration ( )

A. Alcohol and water B. Salt and sediment

C. Salt water D. Iron powder and copper powder

2. After natural water undergoes the following purification operations, soft water will definitely be obtained ()

A. Precipitation B. Filtration C. Adsorption D. Distillation

3. Among the following purification operations, the one with the highest degree of purification is ( )

A. Let stand B. Adsorption C. Filtration D. Distillation

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, separation of substances PPT download, .PPT format;

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"Separation of Matter" PPT:

"Separation of Substances" PPT Part One Content: Crystals and Amorphous Crystals Characteristics of crystals: regular geometric shape, fixed melting point and freezing point Characteristics of amorphous amorphous crystals: no regular geometric shape, no fixed melting point and freezing point during preparation salt..

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Update Time: 2024-07-01

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