"Density" Quality and density PPT download

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"Density" Quality and density PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The relationship between the mass and volume of the same substance

1. In order to study certain characteristics of substances, a student used water and alcohol to conduct experiments and measured the following data:

(1) On the graph paper as shown in the figure, the image of the mass of alcohol changing with the volume has been drawn. Please draw the image of the mass of water changing with the volume;

(2) Analyzing the data of experiment numbers 1 and 5 (or 2, 6 or 3, 7 or 4, 8) in the above table, it can be concluded that water and alcohol with the same volume have different masses;

(3) Through the analysis of data or images, it can be concluded that for the same substance, the ratio of mass to volume is the same; for different substances, the ratio of mass to volume is generally different (please fill in "Same" or "Different" " )of;

(4) Density is usually used in physics to represent this characteristic of matter.

Knowledge point 2 Density

2. Pour out half of a bucket of water. At this time, the mass of the water in the bucket becomes smaller and the density remains unchanged (choose "get bigger", "get smaller" or "unchange").

3. The density of iron is 7.9×103 kg/m3. The physical meaning is that the mass of iron per cubic meter is 7.9×103 kg. There is an existing iron block. If 1/4 of the volume is cut from the iron block, the density of the cut iron will be 7.9×103 kg/m3.

4. Which of the following understandings of the density formula ρ=?/? is correct (B)

A. The density ρ of a certain substance is proportional to its mass m

B. Density is a characteristic of matter, independent of its mass and volume.

C. The density ρ of a certain substance is inversely proportional to its volume V

D. The mass m of a certain substance is inversely proportional to its volume V

5. Xiaolong drew the following four conclusions based on the information provided in the table below. The correct one is (C)

A. Different substances must have different densities

B. The density of solids is greater than the density of liquids

C. Solid aluminum balls and solid copper balls of equal mass, the volume of the aluminum ball is larger

D. The density of the same substance must be the same

Knowledge point 3: Calculation of density

6. A 2.5 L bottle is filled with a certain liquid. The mass of the liquid is 2 kg. It can be seen that the density of the liquid is approximately 0.8×103 kg/m3.

7. (Hainan High School Entrance Examination) The "Nanhai Daily" reported on June 4: "This year's 'Lychee King' weighs 2 taels and 2", that is, the mass of a single lychee reaches 110 g, 110 g = 0.11kg. If the volume of this lychee is 1×10-4 m3, its density is 1.1×103 kg/m3.

8. It is known that the mass of the two spheres A and B is 2:1, and the volume ratio is 1:2, then the ratio of the material densities of the two spheres is (D)

A.1∶2 B.2∶1 C.1∶4 D.4∶1

9. When half of the oxygen in the oxygen bottle is used, the density of oxygen in the bottle (B)

A. Double

B. Reduce to half the original size

C.remain unchanged

D.Unable to determine

Density PPT, Part 2: Comprehensive Capability Improvement

10. Compared with ordinary biscuits carried by field troops, the advantage of compressed biscuits carried by field troops is that when the mass is equal, its volume is smaller and its density is larger (please fill in "larger" or "smaller").

11. A cylinder with a volume of 10 L stores oxygen with a density of 1.0 kg/m3. A piston is used to compress the volume of oxygen to 2 L. Then the density of oxygen after compression is 5kg/m3.

12. Regarding mass and density, which of the following statements is correct (C)

A. Objects composed of the same material have greater mass and density.

B. Objects composed of the same material have a larger volume and a smaller density.

C. Two objects with different densities may have the same mass.

D. The density of the same substance is directly proportional to its mass and inversely proportional to its volume.

13. As shown in Figure A, there are three identical glasses on the table, containing three liquids a, b, and c with the same mass. The relationship between their mass and volume is as shown in Figure B. The three glasses are from The types of liquids filled from left to right are (A)

A.b,c,a B.a,c,b

C.a,b,c D.c,b,a

14. In order to reduce the gravity of the aircraft, the aircraft designer changed a steel part with a density of 7.9 g/cm3 into an aluminum part with a density of 2.7 g/cm3, reducing its mass by 104 kg. The required mass of aluminum is ( B )

A.35.5 kg B.54 kg

C.104 kg D.158 kg

15. The figure shows the relationship between the volume and mass of the three substances A, B, and C. It can be seen from the figure (A)

A.ρA>ρB>ρC, and ρA>ρwater

B.ρA>ρB>ρC, and ρA<ρwater

C.ρC>ρB>ρA, and ρA>ρwater

D.ρC>ρB>ρA, and ρA<ρwater

16. In order to measure the density of a certain liquid, Chang Chang used a balance and a measuring cup to measure the total mass m of the liquid and the measuring cup and the volume V of the liquid. He obtained several sets of data and drew the m-V image, as shown in the figure. Which of the following statements is correct (D)

A. The density of the liquid is 2 g/cm3

B. The density of the liquid is 1.25 g/cm3

C. The mass of the measuring cup is 40 g

D.60 cm3The mass of this liquid is 60 g

17. (Changzhou High School Entrance Examination) Foam steel is a steel material containing rich pores and can be used as the inner core of bulletproof clothing. Porosity refers to the ratio of the volume of all pores in foam steel to the total volume of foam steel. It is known that the density of steel is 7.9×103 kg/m3, and the porosity of a cube of foam steel with a mass of 0.79 kg and a side length of 1 dm is (C)

A.1% B.10%

C.90% D.99%

Density PPT, the third part: expansion, exploration and breakthrough

19. If an alloy is made from metal A with a mass of 2 kg and a density of ρ1 and metal B with a mass of 4 kg and a density of ρ2, what is the density of the alloy?

Solution: The volume of metal armor V A = m_"A" /ρ_1 =(2" " kg)/ρ_1

The volume of metal B V B = m_"B" /ρ_2 =(4" " kg)/ρ_2

The volume of the alloy V = V A + V B = (2" " kg)/ρ_1 + (4" " kg)/ρ_2

The mass of the alloy m=mA+mB=2 kg+4 kg=6 kg

Density of alloy ρ=m/V=(6" " kg)/((2" " kg)/ρ_1 +(4" " kg)/ρ_2 )=(3ρ_1 ρ_2)/(ρ_2+2ρ_1 )

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Update Time: 2024-10-03

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