"Density and Social Life" Quality and Density PPT download

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"Density and Social Life" Quality and Density PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Density and temperature

1. Water has the characteristic of abnormal expansion. The picture shows the ρ-t image of water with a mass of 1 g under standard atmospheric pressure. According to the image, the density of water is maximum when the temperature is 4 ℃ (please fill in "large" or "small"); when the temperature is 0~4 ℃ Inside, water has the property of thermal contraction and cold expansion (optional "thermal expansion and cold expansion" or "heat shrinkage and cold expansion").

2. As early as more than 800 years ago, our country invented this popular toy revolving lantern as shown in the picture, which lit the candle in the revolving lantern and heated the air above the candle flame, causing the air to expand due to heat and become less dense. , the hot air will move upward (select "upward movement", "downward movement" or "rotate around the candle"), pushing the paper pinwheel and the paper horse fixed on its axis to rotate.

Knowledge point 2 Density and material identification

3. The mass of a spoon is 10.8 g and the volume is 4 cm3. Please judge that the material of this spoon is aluminum based on the density values ​​of some solids given in the table below.

4. Water, sulfuric acid and alcohol of equal mass (known as ρ sulfuric acid > ρ water > ρ alcohol) are respectively installed in three test tubes A, B and C with the same specifications. As shown in the figure, it can be determined that (A )

A.A contains alcohol. B.A contains sulfuric acid.

C.B is filled with alcohol. D.C is filled with water.

Knowledge point 3: Other applications of density in social life

5. There are often scenes like this in some story films: a high wall collapses on everyone (actors), causing injuries. But in actual filming, the collapsed high wall will not hurt the actors. The blocks building such a high wall are most likely to be (D)

A. Cement brick B. Metal block

C. Mud bricks D. Styrofoam blocks

6. When designing aircraft, aircraft designers always hope to use lighter but harder materials. The "light" here refers to (A)

A.Small density B.Small mass

C.Small volume D.The above physical quantities must be small

7. To cast a machine part with alloy, you must first make a model of the part with wax. It is known that the mass of the model is 1800 g and the density of wax is 0.9×103 kg/m3. Then casting such an alloy part requires alloy (ρ Alloy=8×103 kg/m3)(B)

A.9 kg B.16 kg

C.18 kg D.72 kg

Density and social life PPT, part 2: improvement of comprehensive capabilities

8. Xiao Ming traveled to Tibet with his parents on May Day. When he returned to Yulin, he found that the mineral water bottle he drank in Tibet had become deflated. The volume of the gas in the mineral water bottle became smaller and the density of the gas in the bottle became larger. In winter, it is full When the water in the water glass bottle freezes, the glass will break because the density of the water becomes smaller and the volume becomes larger during the process of turning into ice (please choose "get bigger", "get smaller" or "unchanged").

9. Like most substances, gasoline has the property of thermal expansion and contraction. As the temperature rises, the density of gasoline becomes smaller (optional "get bigger" or "get smaller"). Affected by this, in summer, the density of gasoline becomes smaller. If the price of gasoline per ton remains unchanged, the price of gasoline per liter should be lowered (optional "raise" or "lower").

10. The heater is usually placed on the floor of the room. Since the density of the hot air at the lower level is less than that of the cold air (optional "big" or "small"), it rises (optional "rising" or "descending"), and the surrounding cold air It is supplemented to form an interactive circulation of cold and hot air, which is more conducive to making the entire room warmer.

11. The density of metal A is 8 g/cm3, and the density of metal B is 4 g/cm3. Take a certain mass of metal A and metal B to make an alloy with a density of 5 g/cm3. Assuming that the total volume remains unchanged, the mass ratio of the two metals A and B taken is 2:3.

12. The temperature in a certain area drops steadily in winter, and the mercury column in the thermometer drops accordingly. Regarding the mercury in this process, which of the following is correct (D)

A.The mass becomes larger B.The mass becomes smaller

C.The density becomes smaller D.The density becomes larger

13. The "full carbon aerogel" solid material is the "lightest" material in the world so far developed by Chinese scientists. It is as strong and durable as high-strength alloy materials. It can withstand high temperatures of 1400 ℃, and its density is only 3 kg/m3. It is known that an aircraft is made of high-strength alloy material with a density of 5×103 kg/m3 and requires 1.5×105 kg of alloy. If “full carbon aerogel” is used instead of alloy material, the required mass of “full carbon aerogel” is (B)

A.9 kg B.90 kg

C.900 kg D.9000 kg

14. It is known that the density of air is 1.29 kg/m3, and the mass of air in an ordinary classroom is closest to (C)

A.The quality of an apple B.The quality of a middle school student

C.The mass of a cow D.The mass of a family car

15. A classmate put a certain liquid in a beaker, measured the total mass m of the beaker and the liquid and the corresponding liquid volume V many times, and made the "m-V" image as shown in the figure based on the experimental data, combined with the following table Content, the following statement is correct (B)

A. The density of the liquid is 1.8 g/cm3

B. Looking at the table, we can see that the liquid is kerosene

C. Looking up the table, we can see that the liquid is vegetable oil.

D.50 cm3 of this liquid has a mass of 45 g

Density and Social Life PPT, Part Three: Expanding Research and Breakthroughs

18. A certain brand of yogurt is sold in the market in two packages. The packaging specification of A is 125 mL, ￥6.00; the packaging specification of B is 125 g, ￥5.40. The salesperson said that the actual prices of the two packages of yogurt are the same. It is known that These two types of packaged yogurt are produced on the same production line and have the same density. Please calculate the density of the yogurt.

Keywords: Free download of PPT courseware for eighth-grade physics volume 1 of the People's Education Press, PPT download of density and social life, PPT download of quality and density, .PPT format;

For more information about the PPT courseware "Quality and Density Density and Social Life", please click the Quality and Density ppt Density and Social Life ppt tag.

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Update Time: 2024-11-22

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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