"Application of Density Knowledge" Quality and Density PPT Courseware 2

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"Application of Density Knowledge" Quality and Density PPT Courseware 2

1. Proportion question

Example 1 The density ratio of two substances A and B is 3:2, and the mass ratio is 2:1. Find the ratio of their volumes.

analyze

This is a question about finding proportions. First, the density formula is deformed to obtain the expression for volume, and then the expression for volume ratio is listed. After simplification, the known ratio is substituted to solve the problem.

2. Smart measurements

Example 2 The mass of an empty bottle is 0.2kg. After filling it with water, the total mass is 1.0kg. After pouring out the water and filling it with another liquid, the total mass is 1.64kg. Find the density of this liquid.

analyze

The density of the liquid is calculated by the ratio of its mass to its volume. Its mass is equal to the total mass of the liquid and the bottle minus the mass of the bottle. Its volume is equal to the volume of the bottle, which is also equal to the volume of water. The volume of water is equal to water. The mass is divided by the density of water, which is equal to the total mass of water and bottle minus the mass of the bottle.

Example 3 In order to determine the density of a certain small steel ball, first fill an empty bottle with water and measure the total mass to be 540g. Then put a small steel ball with a mass of 97.5g into the bottle. After a part of the water overflows, Then measure its total mass to be 625g. Find the density of this small steel ball.

analyze

Because the mass of the steel ball has been given in the question, the density of the steel ball is required. The key is to find the volume of the small steel ball. The volume of the small steel ball is equal to the volume of water displaced by the steel ball. It only requires the mass of water discharged by the steel ball, and the volume of water can be calculated using the density deformation formula. The mass of the discharged water can be calculated as follows: subtract the total mass of the remaining water and the bottle from the total mass of the original full bottle of water and the bottle.

Example 12 Use the following equipment: a spring scale, an empty mineral water bottle (with a cap and a rope tied to the bottle mouth for easy weighing, as shown in the picture), enough water and milk, and measure the density of the milk.

(1) Write down the brief experimental steps (including the physical quantities and symbols that need to be measured)

(2) Write the expression to calculate milk

Example 13 You are given a measuring cylinder, a beaker, a long enough string, a sink and enough water. Please use the above equipment to measure the density of fresh potatoes (the potato sample has been taken, the size is appropriate, and its density is Larger than water and does not absorb water)

(1) Write down the main experimental steps and the symbols of measured physical quantities

(2) After derivation, the expression of potato density is:

Solution: (1) a. Put the potatoes into the beaker; then let the beaker float in the sink (properly move the position of the potatoes in the beaker so that the beaker does not tilt). Tie a thin line around the intersection of the water surface on the outer wall of the cup to make a mark.

b. Take out the potatoes and slowly add water to the cup until the water surface outside the cup rises to the mark, c. Pour the water in the cup into the measuring cylinder and measure its volume d. Add an appropriate amount of water to the measuring cylinder and record the volume V2 of the water. Then put the potatoes into the measuring cylinder and measure the total volume V3 of the water and potatoes.

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For more information about the PPT courseware "Application of Density Knowledge on Mass and Density", please click on the "Application of Density Knowledge on Mass and Density ppt" tab.

"Application of Density Knowledge" Quality and Density PPT Courseware 3:

"Application of Density Knowledge" Mass and Density PPT Courseware 3 [Experience] Identification of Substances Activity 1: Observe two glasses of pure water and salt water with the same volume. Activity 2: Identify whether a gold necklace is made of pure gold. (1) In activity 1, to identify which cup is salt water, your method is __..

"Application of Density Knowledge" Quality and Density PPT Courseware:

"Application of Density Knowledge" Mass and Density PPT Courseware Density (expressed in terms) (a characteristic of matter) 1. Definition: The mass per unit volume of a certain substance is called the density of this substance 2. Calculation formula: Density = mass/volume = ｍ/v 3. Unit and conversion kg/m ..

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Update Time: 2024-09-07

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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