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Density of bronze g ml

13/11/2021 Client: muhammad11 Deadline: 2 Day

Investigation 1: What is the Unknown Metal?

Set B

A metal scrap yard wants to recycle metals but needs to know the identity of the metal before sending it for recycling. In this investigation you will determine a way to identify unknown metals using intensive properties. Density is an example of an intensive property that can be used to identify different metals.

In this investigation, you will determine the identity of two unknown metal samples by calculating the density of each sample.

A group of students recorded the following information during the course of this investigation:

Lab Notes

Investigation Name: __What is the Unknown Metal?____ Date: 05/03/2016

Student Name: _____________________________________

Proposal

We were given two unknown metals to identify. We decided to use density which is an intensive property to identify the different metals. An intensive property is one that does not depend on the amount of material present. Density is defined as mass divided by volume (D=m/V).

We will first determine the mass by weighing each sample of the unknown metals. We will also determine their Volume by measuring the amount of water displaced when each unknown metal is completely submerged in water.

Data

List of the materials we used for this investigation:

-We were assigned Set B: Unknown II & Unknown IV

-An electronic balance

-100mL graduated cylinder

-Water

Each metal was observed and described, then the weight of each cylinder was taken and recorded on Table 1. Three trial were performed.

Unknown I

Unknown IV

Description

Reddish-orange, heavy weight metal

Metallic brownish, heavy weight metal

Table 1: Unknowns Metals

Unknown II

Unknown IV

Trial 1

Mass (g)

244.558

234.782

Trial 2

Mass (g)

244.675

234.941

Trial 3

Mass (g)

244.515

234.325

We filled a graduated cylinder with 20mL of water, then we submerged the Unknown II completely and we recorded the new volume. This procedure was repeated for the other unknown. At the end the difference in volume was calculated. This was repeated two more times and the data was recorded.

Table 2: Volume Displacement

Unknown II

Unknown IV

Trial 1

Trial 2

Trial 3

Trial 1

Trial 2

Trial 3

Initial Volume (mL)

20.00

20.00

20.00

20.00

20.00

20.00

Final Volume (mL)

47.11

46.26

46.40

50.07

50.63

49.51

Vol Difference (mL)

27.11

26.26

26.40

30.07

30.63

29.51

Calculations

We calculated the average mass for each of the unknowns

Unknown II: (244.558g + 244.675g + 244.515g)/ 3 = 244.583g

Unknown IV: (234.782g + 234.941g + 234.325g) /3 = 234.6839

We calculated the average volume for each of the unknowns

Unknown II: (27.11mL + 26.26mL + 26.40mL)/ 3 = 26.59mL

Unknown IV: (30.07mL + 30.63mL + 29.51mL)/ 3 = 30.07mL

We calculated the density for each unknown

Unknown II: 244.583g / 26.59 mL = 9.198 g/mL

Unknown IV: 234.683g / 30.07 mL = 7.804 g/mL

Results

We compared our calculated densities to the densities of various metals and alloys found in appendix J

The calculated density of Unknown II is similar to the density of copper, 9.02 g/mL.

The calculated density of Unknown IV is similar to the density of bronze, 7.80 g/mL.

APPENDIX J: DENSITIES OF VARIOUS METALS

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