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Lab #3 Measurements & Density

Experiment 3A

I Purpose: To determine the area of a sheet of typing paper and express the answer in mm2, cm2, and in2.

II Equipment/Reagents: A sheet of regular typing paper and ruled provided in lab kit.

III Procedure: Measure the length and width of the sheet of typing paper and express this measurement in millimeters rounded to the nearest tenth of a millimeter. Calculate the area of the sheet using the formula:
Area= (length)(width) Round your answers to the correct number of significant digits and write the answers in the correct units. Convert your answer to cm2 and in2.

IV Data or Observations:

Length | Width | Area | 279 mm | 215 mm | 6.00x104 mm2 | 27.9 cm | 21.5 cm | 6.00x102 cm2 | 11.0 in | 8.46 in | 93.1 in2 |

V Calculations:
(279 mm)(215 mm)= 6.00x104 mm2
(27.9 cm)(21.5 cm)= 6.00x102 cm2
(11.0 in)(8.46 in)= 93.1 in2

VI Results/Summary: The area of the typing paper was found to be 6.00x10^4 mm^2, 6.00x 10^2 cm^2, and 93.1 in^2.

Sierra Sisco
Lab #3 Measurements & Density
Experiment 3B

I Purpose: To determine the volume of a rectangular solid and express the answer in mm3, cm3, and in3.

II Equipment/Reagents: Rectangular block in lab kit and vernier caliper.

III Procedure: Measure the length width and height of of the rectangular solid and express measurements in millimeters rounded to the nearest tenth of a millimeter. Record your answers and calculate the volume of the solid using the formula:
Volume= (length)(width)(height) Round your answers to the correct number of significant digits and write the answers in the correct units. Convert your answer to cm3 and in3.

IV Data or Observations:

Length | Width | Height | Volume | 64.5 mm | 25.0 mm | 25.0 mm | 40300 mm3 | 6.45 cm | 2.50 cm | 2.50 cm | 40.3 cm3 | 2.54 in | 0.984 in | 0.984 in | 2.46 in3 |

V Calculations:
(64.5 mm)(25.0 mm)(25.0 mm)= 40300 mm3
(6.45 cm)(2.50 cm)(2.50 cm)= 40.3 cm3
(2.54 in)(0.984 in)(0.984 in)= 2.46 in3

VI Results/Summary: The volume of the rectangular solid was found to be 40300 mm^3, 40.3 cm^3, and 2.46 in^3.

Sierra Sisco
Lab #3 Measurements & Density
Experiment 3C

I Purpose: To determine the volume of a sphere and express the answer in mm3, cm3, and in3.

II Equipment/Reagents: Solid sphere from lab kit and vernier caliper.

III Procedure: Measure the diameter of the solid rounded to the nearest tenth of a millimeter. Record answers. Divide the diameter by two to obtain the radius. Calculate the volume of the sphere using the formula:
Volume= 4/3 π (radius)3 Round your answers to the correct number of significant digits and write the answers in the correct units. Convert your answer to cm3 and in3.

IV Data or Observations:

diameter | radius | volume | 20.5 mm | 10.3 mm | 4580 mm3 | 2.05 cm | 1.03 cm | 4.58 cm3 | 0.807 in | 0.404 in | 0.276 in3 |

V Calculations:
4/3 π (10.3 mm)3=4580 mm3
4/3 π (1.03 cm)3=4.58 cm3
4/3 π (0.404 in)3=0.276 in3

VI Results/Summary: The volume of the sphere was 4580 mm^3, 4.58 cm^3, and 0.276 in^3.

Sierra Sisco
Lab #3 Measurements & Density
Experiment 3D

I Purpose: To determine the densities of a rectangular solid and solid sphere and express the answers in grams/cm3. To identify each solid.

II Equipment/Reagents: Rectangular solid, solid sphere, and balance.

III Procedure: Calculate the density of each solid (in grams/cm3) using the formula:
Density = Mass/Volume Record your answers and identity each solid by using the table below. Choose the density in the table closes to your calculated density. Round your answers to the correct number of significant digits and write the answers in the correct units. Substance | Density (grams/cm3) | Plastic | 0.92 | Wood | 0.76 | Glass | 2.6 | Steel | 7.8 | Nickel | 8.9 | Chromium | 7.2 |

IV Data or Observations:

| mass | volume | density | Rectangular Solid | 30.33 g | 40.3 cm3 | 0.753 g/cm3 | Solid Sphere | 35.90 g | 4.58 cm3 | 7.84 g/cm3 | | | | |

V Calculations:
(30.33 g)/(40.3 cm3)= 0.753 g/cm3
(35.90 g)/(4.58 cm3)= 7.84 g/cm3

VI Results/Summary: The density of the rectangular solid is 0.753 g/cm^3 and for the solid sphere 7.84 g/cm^3.

Sierra Sisco
Lab #3 Measurements & Density
Experiment 3E

I Purpose: To determine the density (grams/mL) of water.

II Equipment/Reagents: Balance, 25 mL graduated cylinder, plastic pipet, and water.

III Procedure: Using the plastic pipet fill the graduated cylinder with water to between 8 and 10 mL, and record the volume to the nearest tenth of a millimeter. Determine the mass of the water. Record this value and calculate the density of the water using the formula:
Density = Mass/Volume Round your answers to the correct number of significant digits and write answer with correct units.

IV Data or Observations: | mass | volume | density | water | 8.04 g | 8.0 mL | 1.0 g/mL | | | | |

V Calculations:
(8.04 g)/(8.0 mL)= 1.0 g/mL

VI Results/Summary: The density of water is 1.0 g/mL.

Sierra Sisco
Lab #3 Measurements & Density
Experiment 3F

I Purpose: To determine the density (grams/mL) of an unknown liquid.

II Equipment/Reagents: Balance, 25 mL graduated cylinder, plastic pipet, and unknown liquid #1.

III Procedure: Using the plastic pipet fill the graduated cylinder with unknown liquid #1 to between 8 and 10 mL, and record the volume to the nearest tenth of a millimeter. Determine the mass of unknown liquid #1. Record this value and calculate the density of unknown liquid #1 using the formula:
Density = Mass/Volume Round your answers to the correct number of significant digits and write answer with correct units.

IV Data or Observations: | mass | volume | density | unknown liquid #1 | 8.58 g | 8.0 mL | 1.1 g/mL | | | | |

V Calculations:
(8.58 g)/(8.0 mL)= 1.1 g/mL

VI Results/Summary: The density of unknown liquid #1 is 1.1 g/mL

Sierra Sisco
Lab #3 Measurements & Density
Experiment 3G

I Purpose: To determine the density (grams/mL) of small metal objects by water displacement.

II Equipment/Reagents: Balance, 25 mL graduated cylinder, water, plastic pipet and small metal objects.

III Procedure: Tare the balance so it reads zero grams. add approximately five milliliters of water to the 25 mL graduated cylinder, and record the volume to the nearest tenth of a milliliter. Place on the balance and press the tare button to zero the balance. Remove the graduated cylinder from the balance and tilt it at an angle of about 45 degrees. Carefully add to it the small metal objects, making sure that no water is splashed out of the graduated cylinder. Place the graduated cylinder, water. and small metal objects on the balance and determine the mass of the small metal objects to the nearest hundredth of a gram. Record this value and the water level in the graduated cylinder to the nearest tenth of a millimeter. To find the volume of the small metal objects subtract the initial volume of the water from the final volume of water. Record this value. Find the density of the small metal objects using the formula:
Density = Mass/Volume Round your answers to the correct number of significant digits and write the answers in the correct units.

IV Data or Observations: volume of water | 6.0 mL | volume of water with metal | 8.4 mL | volume of metal objects | 2.4 mL | mass of metal objects | 16.11 g | density of metal objects | 6.7 g/mL |

V Calculations:
(8.4 mL)-(6.0 mL)= 2.4 mL
(16.11 g)/(2.4 mL)= 6.7 g/mL

VI Results/Summary: The density of the small metal object is 6.7 g/mL.…...

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