8/7/2019 Lab Report Experiment 2

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Experiment 2: Physical Properties-Density Measurements

Summary of Principles

The experiment is about understanding the physical properties of chemical materials and become

recognizable with how the mass and volume measurements are completed. The experimentinvolves using a sense of balance to calculate mass, and a graduated cylinder and a pipette to

compute the volume.

Equations and Mechanisms

y Density = d =

=

y Volume = cube: y Volume = rectangle: lx w x hy Volume = cylinder: 0.785 x x hy Volume = sphere: 0.524 x

Apparatus and Supplies

Balance, 20mL volumetric pipette, 200 mL Erlenmeyer flask, 50mL graduated cylinder, 50 mL

beaker, metal cube

Chemicals

Water ()

Safety Precautions

Never mouth pipette the solution; use a suction device such as a suction bulb! Do not drop metalpiece into graduated cylinder; it may break. Wear safety glasses/goggles to protect your eyes.

Procedure

Part 11. Get a metal bar from your instructor, and then weigh the metal cube 3 times.2. After weighing the metal bar record the data.3. Fill graduated cylinder with water (50 mL).4. After the graduated cylinder is filled, record volume of water.5. Slowly slide metal cube into the graduated cylinder and record volume of both cube and

water.

6. Repeat step four and five two more time and record the data.

8/7/2019 Lab Report Experiment 2

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7. Calculate density and average of the bar for each measurement.Part 2

1. Get 150 mL of water and put it in 200 mL Erlenmeyer flask.2. Dry the beaker and weigh the beaker 3 times and record the data.3. Fill pipette with 20 mL of water from the flask and empty into beaker one or two cm

above the calibration line.4. Record the volume of water.5. After the volume of the water is recorded, weigh water and beaker 3 times.6. Calculate the mass of water in beaker and along with the average.

Observation

When the metal cube was added, it made the water rise.

Results and Discussion

PartO

ne Mass Before MassA

fterMetal 5.65g 5.65g

Water (H2O) 50 mL 53 mL

Part Two Density (g/cm3) Mass Volume

Water 0.99 g/cm3 19.9g 20 mL

Beaker 27.63 g

Water & Beaker 47.7 g

ConclusionOutcome:

1. The water is affected by the density and mass of the solid cube metal.2. The hypothesis is supported by the result of the overall experiment.3. The mass and density of the metal object affected the volume of the water to rise.

Sources of Error:The proper materials were not available to accurately perform the experiment.

Pre-Lab

QuestionsAnswer all Pre-Lab Questions

Post-Lab Questions (if any) (5pts)

Answer all assigned questions for the lab.If there are no pre-lab questions: then Observation section is worth 15 pts.

If there are no post-lab questions: then Results and Discussion section is worth 25 pts.