Скачать презентацию Title Density Equations Date Objective Practice density equations Скачать презентацию Title Density Equations Date Objective Practice density equations

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Title: Density Equations Date: Objective: Practice density equations by answering density story problems. Helpful Title: Density Equations Date: Objective: Practice density equations by answering density story problems. Helpful Info: Mass units are grams (g) Volume units are in (m. L) , (cm 3), (cc) Formulas- Mass / Volume = Density Mass /Density = Volume Density x Volume = Mass

Make a chart like the one below and fill it out as you do Make a chart like the one below and fill it out as you do the story problems. Practice Problems: 1. Formula______ Equation______ 21. Formula______ Equation_____

1. A block of ice has a volume of 19 cm 3. Its mass 1. A block of ice has a volume of 19 cm 3. Its mass is 17. 5 g. What is its density? Formula: Density = Mass /Volume Equation: 17. 5 g/ 19 cm 3 = 0. 9 g/ cm 3

2. Suppose 10 m. L of water has a mass of 10 g. What 2. Suppose 10 m. L of water has a mass of 10 g. What is the density of the water? Formula: Density = Mass / Volume Equation: 10 g /10 Ml =1 g/ m. L

3. An old piece of silver jewelry has a mass of 20 g and 3. An old piece of silver jewelry has a mass of 20 g and a volume of 1. 9 cm 3 What is its density? Formula: Density = Mass /Volume Equation: 20 g / 1. 9 cm 3 = 10. 5 g/cm 3

4. Steel has a density of 7. 8 g/cm 3. If the mass of 4. Steel has a density of 7. 8 g/cm 3. If the mass of a piece of steel is 234 g, what is its volume? Formula: Volume = Mass/Density Equation: 234 g / (7. 8 g) / cm 3 = 30 cm 3

5. The density of a certain type of wood is 0. 6 g/ cm 5. The density of a certain type of wood is 0. 6 g/ cm 3 . If the volume of a piece of this wood is 300 cm 3 , what is its mass? Formula: Mass = Density x Volume Equation: 0. 6 g /cm 3 x 300 cm 3 =180 g

6. A volcanic rock with a volume of 25 cm 3 has a mass 6. A volcanic rock with a volume of 25 cm 3 has a mass of 67. 5 g. What is the density of the rock? A. 0. 67 g/cm 3 B. 2. 7 g/cm 3 C. 42. 5 g/cm 3 D. 92. 5 g/cm 3 Formula: Mass/Volume = Density Equation: 67. 5 g/25 cm 3 = 2. 7 g/cm 3

7. A rock has a density of 8 g/cm 3. If the rock's mass 7. A rock has a density of 8 g/cm 3. If the rock's mass is 2 g, what is the rock's volume? A. 0. 25 cm 3 B. 4 cm 3 C. 16 cm 3 D. 18 cm 3 Formula: Volume = Mass/Density Equation: 2 g/(8 g/cm 3) =. 25 cm 3

8. A student collected data about the density of air. She found that. 1 8. A student collected data about the density of air. She found that. 1 g of air had a volume of 100 cm 3. What is the density of air? A. . 001 g/cm 3 B. . 01 g/cm 3 C. . 1 g/cm 3 D. 1. 0 g/cm 3 Formula: Density = Mass/Volume Equation: . 1 g / 100 cm 3 =. 001 g/cm 3

9. Calculate the density of 72, 000 cm 3 of salt water with a 9. Calculate the density of 72, 000 cm 3 of salt water with a mass of 73, 500 g. A. 2. 4 g/cm 3 B. 2. 2 g/cm 3 C. 1. 02 g/cm 3 D. 0. 8 g/cm 3 Formula: Density =Mass/Volume Equation: 73, 500 g/72, 000 cm 3 = 1. 02 g/cm 3

10. What is the average density of Earth's mantle if a 1, 000 cm 10. What is the average density of Earth's mantle if a 1, 000 cm 3 sample has a mass of 3, 330 g? A. 5. 52 g/cm 3 B. 3. 3 g/cm 3 C. 0. 30 g/cm 3 D. 0. 37 g/cm 3 Formula: Density= Mass / Volume Equation: 3, 300 g/1, 000 cm 3 = 3. 3 g/cm 3

11. If a sample of ocean water has a density of 1. 03 g/cm 11. If a sample of ocean water has a density of 1. 03 g/cm 3 and a mass of 42, 000. 0 g, what is the volume of the water? A. 38, 877 cm 3 B. 40, 800 cm 3 C. 42, 000 cm 3 D. 42. 235 cm 3 Formula: Volume= Mass / Density Equation: 42, 000 g/(1. 03 g/cm 3) = 40, 777 cm 3 Round to 3 significant figures. 40, 800 cm 3

12. The Dead Sea contains the highest concentration of salt in any body of 12. The Dead Sea contains the highest concentration of salt in any body of water on Earth. If 1230 cm 3 of Dead Sea water has a mass of 1550 g, what is the density of the water? A. 0. 79 g/cm 3 B. 1. 02 g/cm 3 C. 1. 13 g/cm 3 D. 1. 26 g/cm 3 Formula: Density =Mass/Volume Equation: 1550 g/1230 cm 3 = 1. 26 g/cm 3

13. A liquid has a density of 1 g/m. L. If you have 50 13. A liquid has a density of 1 g/m. L. If you have 50 m. L of the liquid, what would its mass be? A. 25 g B. 50 g C. 75 g D. 100 g Formula: Mass = Volume x Density Equation: 50 m. L x 1 g/m. L = 50 g

14. A square chunk of plastic has a length of 5 cm, width of 14. A square chunk of plastic has a length of 5 cm, width of 5 cm and height of 5 cm. It has a mass of 200 g. What is its density? A. . 12 g/cm 3 B. 1. 0 g/cm 3 C. 1. 6 g/cm 3 D. 2. 3 g/cm 3 Formula: Density= Mass / Volume Equation: 200 g /(5 x 5 x 5) =1. 6 g/cm 3

15. Water has a density of 1 g/m. L. What density might a typical 15. Water has a density of 1 g/m. L. What density might a typical rock be? A. . 005 g/cm 3 B. . 5 g/cm 3 C. 5 g/cm 3 D. 50 g/cm 3

Hint: Rocks are more dense than water. The answer would have to be more Hint: Rocks are more dense than water. The answer would have to be more than the density of water which is 1 g/m. L. Answer: Letter ‘C’ with 5 g/cm 3 is the next most dense after water with letter ‘D’ extremely dense, not a good choice.

*16. A rock dropped in a graduated cylinder raises the level of water from *16. A rock dropped in a graduated cylinder raises the level of water from 20 to 35 m. L. The rock has a mass of 45 g. What is the density of the rock? A. 1. 3 g/cm 3 B. 2. 3 g/cm 3 C. 3. 0 g/m. L D. 4. 5 g/cm 3 Formula: Density = Mass/Volume displacement from 20 m. L to 35 ml is = 15 m. L Equation: 45 g/ 15 m. L = 3. 0 g/m. L

*17. Water has a density of 1 gram/milliliter. There are four rocks that all *17. Water has a density of 1 gram/milliliter. There are four rocks that all have the same volume of 5 cubic centimeters. The mass for each of these rocks is given below. Which of the four rocks will float when placed in water? A. 15 grams B. 10 grams C. 6 grams D. 4 grams

Formula: M/V=D X/5= (<1) Answer : A. 15/5=3 B. 10/5=2 C. 6/5=1. 2 D. Formula: M/V=D X/5= (<1) Answer : A. 15/5=3 B. 10/5=2 C. 6/5=1. 2 D. 4/5=0. 8 *

*18. A liquid is found to have a volume of 75 m. L in *18. A liquid is found to have a volume of 75 m. L in a graduate. When placed on a balance, the liquid and graduated cylinder have a mass of 125 g. The empty graduated cylinder has a mass of 50 g. What is the density of the liquid? A. . 1 g/m. L B. 1 g/m. L C. 2. 2 g/m. L D. 22 g/m. L

Hint: Density =M / V 125 g (cylinder w/ liquid) subtract 50 g (cylinder Hint: Density =M / V 125 g (cylinder w/ liquid) subtract 50 g (cylinder alone)=75 g Equation: 75 /75 m. L =1 g/m. L

*19. Water has a density of 1. 0 g/m. L. Which of the following *19. Water has a density of 1. 0 g/m. L. Which of the following substances would float in water?

A. a substance with a volume of 418. 2 m. L and a mass A. a substance with a volume of 418. 2 m. L and a mass of 423. 23 grams B. a substance with a mass of 534. 23 grams and a volume of 522. 3 m. L C. a substance with a volume of 3. 35 m. L and a mass of 22. 64 grams D. a substance with a mass of 1. 33 grams and a volume of 1. 38 m. L

Formula: Divide Mass by volume for each. The answer must be less than 1. Formula: Divide Mass by volume for each. The answer must be less than 1. 0 g/m. L to float, the density of water. Equation: D 1. 33 g/1. 38 m. L = 0. 96 g/m. L. This is less dense than water, so it will float.