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Specific Heat Capacity Lab data and processing

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Introduction

Justin Germani Specific Heat Capacity January 24, 2012

Data:

Object 1

	Mass m/g ∆m = ±0.1 g	Temperature T/ (°C) ∆T= ±0.1°C
	Mass m/g ∆m = ±0.1 g	initial	final	change
Object	62.3	100.3	26.4	-73.9
Aluminum Calorimeter w/ water	156.5	23.1	26.4	+03.3
water	114.0	-	-	-

Object 2

	Mass m/g ∆m = ±0.1 g	Temperature T/ (°C) ∆T= ±0.1°C
	Mass m/g ∆m = ±0.1 g	initial	final	change
Object	34.5	100.6	29.2	-71.4
Aluminum Calorimeter w/ water	155.6	26.2	29.2	+03.0
water	113.1	-	-	-

Object 3

Mass

m/g

Middle

34.4

+06.3

water

112.9

For each table above:
∆- represents uncertainty
-mass of Aluminum Calorimeter is 42.5g

Sample Calculations:

Calculate specific heat capacity (c):

Object 1

Q lost by block = Q gained by water + Q gained by Al

0.0623(c)(-73.9) = 0.114(4200)(03.3) + 0.0425(910)(03.3)
c = 371 J/kg/°C (3 significant figures)

Results:

	Specific Heat Capacity c / JKg-1°C-1
Object 1	370.9
Object 2	625.6
Object 3	318.9

Data:

Freezing Aluminum block

	Mass m/g ∆m = ±0.1 g	Temperature T/ (°C) ∆T= ±0.1°C
	Mass m/g ∆m = ±0.1 g	initial	final	change
Aluminum block	62.3		16.2
Aluminum calorimeter	46.5	-	-	-
Aluminum Calorimeter w/ water	156.5	19.7	16.2	-03.5
water	114.0	-	-	-

Calculate Initial Temperature of Aluminum block:

Conclusion

The % difference of object two was very large at 31.3% this could be due to random error but more likely due to the block not being fully submerged as I mentioned earlier.

The value of the percentage difference for Object3 which was Copper was relatively high at 17.2%,

In order to improve upon the experiment a scale that measures up to a higher mass such as 500g. Another method to improve the experiment would be to add more water to the calorimeter in order to insure the block was fully submerged. Another improvement that could be made would be to not drop the blocks into the calorimeter and therefore minimize the risk of losing water after the mass was taken.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

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