"Water can dissolve some substances" Dissolution PPT download

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"Water can dissolve some substances" Dissolution PPT download

Part 1: Table salt dissolved in water

1. Observe and describe the state of salt in water

Experimental equipment: beaker, spoon, glass rod, salt, water

1. Take a level spoonful of salt and place it in the water in the beaker and observe.

2. Stir gently for a few times and observe.

3. Stir for a while, let it sit, and observe.

What is the conclusion of the observation?

Observation: Some substances (such as table salt, etc.) can dissolve in water.

How to observe and describe the state of sand in water?

Water can dissolve some substances PPT, part 2: Does flour dissolve in water?

1. Observe the state of flour in water

1. Take a small spoonful of flour, put it into a glass filled with water, and observe the changes in the flour.

2. Stir gently with a glass rod and observe the changes in the flour in the water.

3. Leave it for a while and observe the changes in the flour in the water.

2. Compare the dissolution of flour, sand and salt in water

So how to tell whether they are dissolved in water?

Use filtration

What instruments are needed for filtration?

Filter paper, iron stand, funnel, glass rod, beaker

What should you pay attention to when doing filtration experiments?

When doing filtration experiments, you should pay attention to "one stick, two low, three rely"

One stick: The filter paper sticks to the funnel wall.

Second low: the filter paper is lower than the funnel mouth. The liquid level is lower than the edge of the filter paper.

Three supports: The mouth of the beaker for adding liquid relies on the glass rod for drainage. The end of the drainage glass rod rests on three layers of filter paper. The funnel tube is against the wall of the beaker.

Water can dissolve some substances PPT, Part 3: Classroom exercises

1. Fill in the blanks

1. Flour ________ dissolves in water, and salt _________ dissolves in water. (Fill in “can” and “can’t”)

2. Certain solid substances dissolved in water can form ________, _______, or ________ solutions.

3. Flour cannot dissolve in water, we can separate it using ______ method.

4. Substances turn into particles invisible to the naked eye in water, which are evenly distributed in the water and cannot be separated by sedimentation or filtration. This phenomenon is called _______.

2. Look at the picture and fill in the blanks

1. This method is called _______. The instruments used are __________ and ________.

2. This method is called _______. It can determine ____________________.

3. Multiple choice questions

1. If ( ), then it means that the salt is dissolved in the water.

A The salt sinks to the bottom of the cup B The water level in the cup rises C The salt is no longer visible in the water

2. The method to determine whether a substance is dissolved in water is ( ).

A filter B boil C add other substances

3. When a spoonful of sand is put into the water, I see ( ), which means the sand is not dissolved in the water.

A No sand is seen on the filter paper B The sand sinks to the bottom of the cup C The water in the cup becomes turbid

Water can dissolve some substances PPT, Part 4 content: Class summary

1. Characteristics of dissolution: Substances turn into particles invisible to the naked eye in water, which are evenly distributed in the water and cannot be separated by sedimentation or filtration.

2. The equipment used in the filtration experiment includes: iron stand, funnel, filter paper, glass rod, and beaker.

3. When doing filtration experiments, pay attention to "one stick, two low, and three rely".

One stick: The filter paper sticks to the inner wall of the funnel. Second low: the filter paper is lower than the edge of the funnel, and the filtrate is lower than the edge of the filter paper. Three supports: The beaker for pouring the filtrate is close to the glass rod, the glass rod is close to the three-layer filter paper, and the end of the funnel is close to the inner wall of the beaker that receives the filtrate.

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For more information about the "Dissolved Water Can Dissolve Some Substances" PPT courseware, please click the Dissolved ppt Water Can Dissolve Some Substances ppt label.

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Update Time: 2024-09-08

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